User’s Guide Part Number: E3640-90001 January 2000. For Safety information, Warranties, and Regulatory information, see the pages behind the Index. © Copyright Agilent Technologies 1999 - 2000 All Rights Reserved.
The Agilent Technologies E3640A/E3641A (30 watt), E3642A/E3643A (50 watt), and E3644A/E3645A (80 watt) are high performance single-output dual range programmable DC power supplies with GPIB and RS-232 interfaces. The combination of bench-top and system features in these power supplies provides versatile solutions for your design and test requirements.
The Front Panel at a Glance 1 2 3 4 5 6 2 Low voltage range selection Key High voltage range selection Key Overvoltage protection Key Display limit Key Voltage/Current adjust selection Key Stored state Recall/Reset Menu 7 8 9 10 11 12 State storage menu/Local Key View menu/Calibrate Key I/O Configuration menu/Secure Key Output On/Off Key Resolution selection Keys Knob
Front-Panel Menu/Key Reference This section gives an overview of the front-panel keys/menus. The menus are designed to automatically guide you through all parameters required to configure a particular function or operation. 1 Low voltage range selection key Selects the low voltage range and allows its full rated output to the output terminals. 2 High voltage range selection key Selects the high voltage range and allows its full rated output to the output terminals.
Front-Panel Voltage and Current Limit Settings You can set the voltage and current limit values from the front panel using the following method. Use the voltage/current adjust selection key, the resolution selection keys, and the control knob to change the voltage and current limit values. Low Or + High 1 Select the desired voltage range using the voltage range selection keys after turning on the power supply. 2 Press Display key to show the limit values on the display.
Display Annunciators Adrs Rmt 8V* 20V* 35V** 60V** OVP Power supply is addressed to listen or talk over a remote interface. Power supply is in remote interface mode. Shows the low voltage range is selected. Shows the high voltage range is selected. Shows the low voltage range is selected. Shows the high voltage range is selected.
The Rear Panel at a Glance Note: The supplier code of the C-Tick for the E3643A/45A is N10149. 1 AC inlet 2 Power-line fuse-holder assembly 3 Power-line module 4 RS-232 interface connector 5 GPIB (IEEE-488) interface connector 6 Rear output terminals I/O Use the front-panel Config key to: • Select the GPIB or RS-232 interface (see chapter 3). • Set the GPIB address (see chapter 3). • Set the RS-232 baud rate and parity (see chapter 3).
In This Book Quick Start Chapter 1 helps you get familiar with a few of the power supply’s the front panel feature. General Information Chapter 2 contains a general description of your power supply. This chapter also provides instructions for installation of your power supply and the output connections. Front-Panel Operation Chapter 3 describes in detail the use of front-panel keys and how they are used to operate the power supply from the front panel.
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Contents Chapter 1 Quick Start Preliminary Checkout- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Output Checkout- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Voltage Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - Current Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - If the Power Supply Does Not Turn On - - - - - - - - - - - - - - - - - - - Line Voltage Conversion- - - - - - - - - - - - - - - - - - - - - - - - - -
Contents Contents System-Related Operations- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 55 State Storage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 55 Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 56 Error Conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 56 Firmware Revision Query - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57 SCPI Language Version - - - - - - - - - -
Contents Contents The Status Byte Register - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97 Using Service Request (SRQ) and Serial POLL - - - - - - - - - - - 98 Using *STB? to Read the Status Byte - - - - - - - - - - - - - - - - - - - 99 Using the Message Available Bit (MAV) - - - - - - - - - - - - - - - - - 99 To Interrupt Your Bus Controller Using SRQ - - - - - - - - - - - - 99 To Determine When a Command Sequence is Completed - 100 Using *OPC to Signal When Data is in the Output Buffer - -
Contents Appendix Service Information Contents Operating Checklist- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Is the Power Supply Inoperative? - - - - - - - - - - - - - - - - - - - - Does the Power Supply Fail Self-Test? - - - - - - - - - - - - - - - - Types of Service Available - - - - - - - - - - - - - - - - - - - - - - - - - - - - Standard Repair Service (worldwide)- - - - - - - - - - - - - - - - - Express Exchange (U.S.A.
Contents 179 179 180 181 181 181 181 182 183 187 188 189 189 189 190 191 Contents Performance Test Record for Your Power Supply - - - - - - - - - CV Performance Test Record - - - - - - - - - - - - - - - - - - - - - - - CC Performance Test Record - - - - - - - - - - - - - - - - - - - - - - - Calibration Reference- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Agilent Technologies Calibration Services- - - - - - - - - - - - - Calibration Interval - - - - - - - - - - - - - - - - - - - - - -
Contents Contents 14
1 Quick Start
Quick Start One of the first things you will want to do with your power supply is to become acquainted with the front panel. The exercises in this chapter prepare the power supply for use and help you get familiar with some of its front-panel operations. This chapter is intended for both the experienced and the inexperienced user because it calls attention to certain checks that should be made prior to operation. Throughout this chapter the key to be pressed is shown in the left margin.
Chapter 1 Quick Start Preliminary Checkout 1 Preliminary Checkout The following steps help you verify that the power supply is ready for use. 1 Check the list of supplied items. Verify that you have received the following items with your power supply. If anything is missing, contact your nearest Agilent Technologies Sales Office. One power cord for your location. This User’s Guide. Quick Reference Guide. Certificate of Calibration. 2 Connect the power cord and turn on the power supply.
Chapter 1 Quick Start Output Checkout Output Checkout The following procedures check to ensure that the power supply develops its rated outputs and properly responds to operation from the front panel. For complete performance and verification tests, refer to the Service Information. Note: If an error has been detected during the output checkout procedures, the ERROR annunciator will turn on. See "Error Messages" starting on page 113 in chapter 5 for more information.
Chapter 1 Quick Start Output Checkout 1 Current Output Checkout The following steps check basic current functions with a short across the power supply’s output. Power 1 Turn on the power supply. Make sure that the output is disabled. The OFF annunciator is on 2 Connect a short across (+) and (-) output terminals with an insulated test lead. Use a wire size sufficient to handle the maximum current (See "Table 2-1 Wire Rating" on page 34 in chapter 2). Output On/Off 3 Enable the output.
Chapter 1 Quick Start If the Power Supply Does Not Turn On If the Power Supply Does Not Turn On Use the following steps to help solve problems you might encounter when turning on the instrument. If you need more help, refer to chapter 5 for instructions on returning the instrument to Agilent Technologies for service. 1 Verify that there is ac power to the power supply. First, verify that the power cord is firmly plugged into the power receptacle on the rear panel of the power supply.
Chapter 1 Quick Start Line Voltage Conversion 1 Line Voltage Conversion Warning Shock Hazard Operating personnel must not remove power supply covers. Component replacement and internal adjustments must be made only by qualified service personnel. Line voltage conversion is accomplished by adjusting two components: the line voltage selection switch and the power-line fuse on the rear panel. 1 Remove AC line power. 2 Remove the cover (Refer to General Disassembly on page 164).
Chapter 1 Quick Start Line Voltage Conversion 1 Remove the power cord. Remove the fuse-holder assembly with a flatblade screwdriver from the rear panel. 2 Remove the fuse-holder from the assembly. 3 Replace with the correct fuse. 4 Replace the fuse-holder assembly in rear panel. Verify that the correct line voltage is selected and the power-line fuse is good.
Chapter 1 Quick Start To Adjust the Carrying Handle 1 To Adjust the Carrying Handle To adjust the position, grasp the handle by the sides and pull outward. Then, rotate the handle to the desired position.
Chapter 1 Quick Start To Rack Mount the Instrument To Rack Mount the Instrument You can mount the power supply in a standard 19-inch rack cabinet using one of three optional kits available. Instructions and mounting hardware are included with each rack-mounting kit. Any Agilent Technologies System II instrument of the same size can be rack-mounted beside the Agilent E3640A, E3641A, E3642A, E3643A, E3644A, or E3645A.
Chapter 1 Quick Start To Rack Mount the Instrument 1 To rack mount a single instrument, order adapter kit 5063-9240. To rack mount two instruments side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9212. Be sure to use the support rails inside the rack cabinet. To install one or two instruments in a sliding support shelf, order shelf 5063-9255, and slide kit 1494-0015 (for a single instrument, also order filler panel 5002-3999).
Chapter 1 Quick Start To Rack Mount the Instrument 26
2 General Information
General Information This manual describes the operation of the Agilent Technologies Model E3640A, E3641A, E3642A, E3643A, E3644A and E3645A DC power supplies. This chapter contains a general description of your power supply. This chapter also provides instructions for installation of your power supply and the output connections. Unless otherwise stated, the information in this manual applies to all the six models.
Chapter 2 General Information Safety Considerations Safety Considerations This power supply is a Safety Class I instrument, which means that it has a protective earth terminal. That terminal must be connected to earth ground through a power source with a 3-wire ground receptacle. Before installation or operation, check the power supply and review this manual for safety markings and instructions. Safety information for specific procedures is located at the appropriate places in this manual.
Chapter 2 General Information Options and Accessories Options and Accessories Options Option ‘‘0E3’’ and ‘‘0E9’’ determine which power-line voltage is selected at the factory. The standard unit is configured for 115 Vac ± 10%, 47-63 Hz input voltage. For more information about changing the power-line voltage setting, see Line Voltage Conversion on page 21.
Chapter 2 General Information Description Description This power supply features a combination of programming capabilities and linear power supply performance that makes it ideal for power systems applications. The power supply may be programmed locally from the front panel or remotely over the GPIB and RS-232 interfaces. This power supply has two ranges, allowing more voltage at a lower current or more current at a lower voltage.
Chapter 2 General Information Description When operated over the remote interface, the power supply can be both a listener and a talker. Using an external controller, you can instruct the power supply to set the output and to send the status data back over the GPIB or RS-232.
Chapter 2 General Information Installation Installation Initial Inspection When you receive your power supply, inspect it for any obvious damage that may have occurred during shipment. If any damage is found, notify the carrier and the nearest Agilent Technologies Sales Office immediately. Warranty information is shown in the front of this manual. Keep the original packing materials in case the power supply has to be returned to Agilent Tecnologies in the future.
Chapter 2 General Information Output Connections Output Connections Warning Before attempting to connect wires to the rear output terminals, make sure to turn off the power supply first to avoid damage to the circuits being connected. Front panel binding posts are available to connect load wires for bench operation and are paralleled with the rear panel (+) and (-) connections. Both front and rear panel terminals are optimized for noise, regulation, and transient response as documented in chapter 8.
Chapter 2 General Information Output Connections Voltage Drops The load wires must also be large enough to avoid excessive voltage drops due to the impedance of the wires. In general, if the wires are heavy enough to carry the maximum short circuit current without overheating, excessive voltage drops will not be a problem. The voltage drops across the load wires should be limited to less than two volts. Refer to Table 2-1 to calculate the voltage drop for some commonly used AWG copper wire.
Chapter 2 General Information Output Connections Reverse Current Loading An active load connected to the power supply may actually deliver a reverse current to the supply during a portion of its operating cycle. An external source can not be allowed to pump current into the supply without risking loss of regulation and possible damage. These effects can be avoided by pre-loading the output with a dummy load resistor.
Chapter 2 General Information Output Connections Stability Using remote sensing under certain combinations of load lead lengths and large load capacitances may cause your application to form a filter, which becomes part of the voltage feedback loop. The extra phase shift created by this filter can degrade the power supply’s stability, resulting in poor transient response or loop instability. In severe cases, it may cause oscillations.
Chapter 2 General Information Output Connections Multiple Loads When connecting multiple loads to the power supply, each load should be connected to the output terminals using separate connecting wires. This minimizes mutual coupling effects between loads and takes full advantage of the low output impedance of the power supply. Each pair of wires should be as short as possible and twisted or bundled to reduce lead inductance and noise pick-up.
3 Front-Panel Operation and Features
Front-Panel Operation and Features So far you have learned how to install your power supply and do quick start. During the quick start, you were briefly introduced to operating from the front panel as you learned how to check basic voltage and current functions. This chapter describes in detail the use of the front-panel keys and shows how they are used to accomplish power supply operation.
Chapter 3 Front-Panel Operation and Features Front-Panel Operation Overview Front-Panel Operation Overview The following section describes an overview of the front-panel keys before operating your power supply. • The power supply is shipped from the factory configured in the front-panel operation mode. At power-on, the power supply is automatically set to operate in the front-panel operation mode. When in this mode, the frontpanel keys can be used.
Chapter 3 Front-Panel Operation and Features Constant Voltage Operation Constant Voltage Operation To set up the power supply for constant voltage (CV) operation, proceed as follows. • Front-panel operation: 1 Connect a load to the output terminals. With power-off, connect a load to the (+) and (-) output terminals. Power 2 Turn on the power supply.
Chapter 3 Front-Panel Operation and Features Constant Voltage Operation Voltage Current Display Limit Output On/Off 1 5 Adjust the knob for the desired output voltage. Check that the Limit annunciator still flashes. Set the knob for voltage control. Change the flashing digit using the resolution selection keys and adjust the knob for the desired output voltage. 6 Return to the meter mode. Press Display or let the display time-out after several seconds to return to the Limit meter mode.
Chapter 3 Front-Panel Operation and Features Constant Current Operation Constant Current Operation To set up the power supply for constant current (CC) operation, proceed as follows. • Front-panel operation: 1 Connect a load to the output terminals. With power-off, connect a load to the (+) and (-) output terminals. Power 2 Turn on the power supply.
Chapter 3 Front-Panel Operation and Features Constant Current Operation Voltage Current Display Limit Output On/Off 1 5 Adjust the knob for the desired output current. Check that the Limit annunciator still flashes. Set the knob for current control. Change the flashing digit using the resolution selection keys and adjust the knob to the desired output current. 6 Return to the meter mode. Press Display or let the display time-out after several seconds to return to the Limit meter mode.
Chapter 3 Front-Panel Operation and Features Configuring the Remote Interface Configuring the Remote Interface This power supply is shipped with both a GPIB (IEEE-4888) interface and an RS-232 interface. The GPIB interface is selected when the power supply is shipped from the factory. Only one interface can be enabled at a time. To exit I/O the I/O configuration mode without any changes, press Config key until the ‘‘NO CHANGE’’ message is displayed.
Chapter 3 Front-Panel Operation and Features Configuring the Remote Interface RS-232 Configuration I/O Config 1 Turn on the remote configuration mode. GPIB / 488 Notice that if you changed the remote interface selection to RS-232 before, “RS-232” message is displayed. 2 Choose the RS-232 interface. 3 RS-232 You can choose the RS-232 interface by turning the knob. I/O Config 3 Select the baud rate Select one of the following: 300, 600, 1200, 2400, 4800, or 9600 (factory setting) baud.
Chapter 3 Front-Panel Operation and Features Storing and Recalling Operating States Storing and Recalling Operating States You can store up to five different operating state in non-volatile storage locations. When shipped from the factory, storage locations ‘‘1’’ through ‘‘5’’ are empty. You can name a location from the front panel or over the remote interface but you can only recall a named state from the front panel. The following steps show you how to store and recall an operating state.
Chapter 3 Front-Panel Operation and Features Storing and Recalling Operating States Store 4 Save the operating state DONE Recalling a Stored State Recall 1 Turn on the recall mode. Memory location “1” will be displayed in the recall mode. 3 1: p15v_test 2 Select the stored operating state. 2: state2 reset You can select the above RESET mode to reset the power supply to the poweron state without turning power off/on or without using ‘‘*RST’’ command over the remote interface.
Chapter 3 Front-Panel Operation and Features Programming Overvoltage Protection Programming Overvoltage Protection Overvoltage protection guards the load against output voltages reaching values greater than the programmed protection level. It is accomplished by shorting the output via an internal SCR when the trip level is set to equal or greater than 3 volts, or by programming the output to 1 volt when the trip level is set to less than 3 volts.
Chapter 3 Front-Panel Operation and Features Programming Overvoltage Protection Checking OVP Operation To check OVP operation, raise the output voltage to near the trip point. Then very gradually increase the output by turning the knob until the OVP circuit trips. This will cause the power supply output to drop to near zero, the OVP annunciator to flash, and the CC annunciator to turn on. The “OVP TRIPPED” message also appears on the display.
Chapter 3 Front-Panel Operation and Features Programming Overvoltage Protection By Adjusting OVP trip level Over Voltage Over Voltage 1 Raise the OVP trip level higher than the level tripped. 2 Select the OVP CLEAR mode by turning the knob. OVP ON OVP CLEAR Over Voltage 3 Clear the overvoltage condition and exit this menu. done The OVP annunciator will not flash any more. The output will return to the meter mode.
Chapter 3 Front-Panel Operation and Features Programming Overvoltage Protection Note The power supply’s OVP circuit contains a crowbar SCR, which effectively shorts the output of the power supply whenever the overvoltage condition occurs. If external voltage source such as a battery is connected across the output, and the overvoltage condition inadvertently occurs, the SCR will continuously sink a large current from the source; possibly damaging the power supply.
Chapter 3 Front-Panel Operation and Features Disabling the Output Disabling the Output The output of the power supply can be disabled or enabled from the front panel. • When the power supply is in the “Off” state, the OFF annunciator turns on and the output is disabled. The OFF annunciator turns off when the power supply returns to the “On” state. When the output is disabled, the voltage value is 0 volts and the current value is 0.02 amps.
Chapter 3 Front-Panel Operation and Features System-Related Operations System-Related Operations This section gives information on system-related topics such as storing power supply states, reading errors, running a self-test, displaying messages on the front panel, and reading firmware revisions. State Storage The power supply has five storage locations in non-volatile memory to store power supply states. The locations are numbered 1 through 5.
Chapter 3 Front-Panel Operation and Features System-Related Operations • Remote Interface Operation: Use the following commands to store and recall power supply state. *SAV {1|2|3|4|5} *RCL {1|2|3|4|5} To assign a name to a stored state to be recalled from the front panel, send the following command. From the remote interface, you can only recall a stored state using a number (1 through 5).
Chapter 3 Front-Panel Operation and Features System-Related Operations Firmware Revision Query The power supply has three microprocessors for control of various internal systems. You can query the power supply to determine which revision of firmware is installed for each microprocessor. • The power supply returns three revision numbers. The first number is the firmware revision number for the main processor; the second is for the input/output processor; and the third is for the front-panel processor.
Chapter 3 Front-Panel Operation and Features GPIB Interface Reference GPIB Interface Reference The GPIB connector on the rear panel connects your power supply to the computer and other GPIB devices. Chapter 2 lists the cables that are available from Agilent Technologies. A GPIB system can be connected together in any configuration (star, linear, or both) as long as the following rules are observed: Each device on the GPIB (IEEE-488) interface must have a unique address.
Chapter 3 Front-Panel Operation and Features RS-232 Interface Reference RS-232 Interface Reference The power supply can be connected to the RS-232 interface using the 9-pin (DB-9) serial connector on the rear panel. The power supply is configured as a DTE (Data Terminal Equipment) device. For all communications over the RS-232 interface, the power supply uses two handshake lines: DTR (Data Terminal Ready, on pin 4) and DSR (Data Set Ready, on pin 6).
Chapter 3 Front-Panel Operation and Features RS-232 Interface Reference Connection to a Computer or Terminal To connect the power supply to a computer or terminal, you must have the proper interface cable. Most computers and terminals are DTE (Data Terminal Equipment) devices. Since the power supply is also a DTE device, you must use a DTE-to-DTE interface cable. These cables are also called null-modem, modem-eliminator, or crossover cables.
Chapter 3 Front-Panel Operation and Features RS-232 Interface Reference DB-25 Serial Connection If your computer or terminal has a 25-pin serial port with a male connector, use the null-modem cable and 25-pin adapter included with the Agilent 34398A Cable Kit. The cable and adapter pin diagram are shown below.
Chapter 3 Front-Panel Operation and Features Calibration Overview Calibration Overview This section gives an overview of the calibration features of the power supply. For more detailed discussion of the calibration procedures, see the Service Information. Calibration Security This feature allows you to enter a security code to prevent accidental or unauthorized calibrations of the power supply. When you first receive your power supply, it is secured.
Chapter 3 Front-Panel Operation and Features Calibration Overview To Unsecure for Calibration You can unsecure the power supply either from the front panel or over the remote interface. The power supply is secured when shipped from the factory. See the table 3-1 for the factory setting secure code for your power supply. Power View Calibrate 1 Select the calibration mode.
Chapter 3 Front-Panel Operation and Features Calibration Overview To Secure Against Calibration You can secure the power supply against calibration either from the front panel or over the remote interface. The power supply is secured when shipped from the factory. Be sure to read the security code rules on page 62 before attempting to secure the power supply. • Front-Panel Operation: Power View Calibrate 1 Select the calibration mode.
Chapter 3 Front-Panel Operation and Features Calibration Overview To Change the Security Code To change the security code, you must first unsecure the power supply, and then enter a new code. Be sure to read the security code rules on page 62 before attempting to secure the power supply. • Front-Panel Operation: To change the security code, first make sure that the power supply is I/O unsecured.
Chapter 3 Front-Panel Operation and Features Calibration Overview Calibration Message The power supply allows you to store one message in calibration memory in the mainframe. For example, you can store such information as the date when the last calibration was performed, the date when the next calibration is due, the power supply’s serial number, or even the name and phone number of the person to contact for a new calibration.
4 Remote Interface Reference
Remote Interface Reference • SCPI Command Summary‚ starting on page 69 SCPI • Simplified Programming Overview‚ starting on page 74 • Using the APPLy Command‚ on page 77 • Output Setting and Operation Commands‚ starting on page 78 • Triggering‚ starting on page 82 • System-Related Commands‚ starting on page 85 • State Storage Commands‚ on page 88 • Calibration Commands‚ starting on page 89 • Interface Configuration Commands‚ on page 92 • The SCPI Status Registers‚ starting on page 93 • Status Reporting Com
Chapter 4 Remote Interface Reference SCPI Command Summary SCPI Command Summary This section summarizes the SCPI (Standard Commands for Programmable Instruments) commands available to program the power supply over the remote interface. Refer to the later sections in this chapter for more complete details on each command. Throughout this manual, the following conventions are used for SCPI command syntax. • Square brackets ([ ]) indicate optional keywords or parameters.
Chapter 4 Remote Interface Reference SCPI Command Summary Output Setting and Measurement Commands (see page 78 for more information) APPLy {|DEF|MIN|MAX}[,{|DEF|MIN|MAX}] APPLy? [SOURce:] CURRent[:LEVel][:IMMediate][:AMPLitude]{|MIN|MAX|UP|DOWN} CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] CURRent[:LEVel][:IMMediate]:STEP[:INCRement] { |DEFault} CURRent[:LEVel][:IMMediate]:STEP[:INCRement]? [DEFault] CURRent[:LEVel]:TRIGgered[:AMPLitude] {|MIN|MAX}
Chapter 4 Remote Interface Reference SCPI Command Summary Triggering Commands (see page 82 for more information) INITiate[:IMMediate] TRIGger[:SEQuence] :DELay {|MIN|MAX} :DELay?[MIN|MAX] :SOURce {BUS|IMM} :SOURce? *TRG System-Related Commands (see page 85 for more information) 4 DISPlay[:WINDow] [:STATe] {OFF|ON} [:STATe]? :TEXT[:DATA] :TEXT[:DATA]? :TEXT:CLEar SYSTem :BEEPer[:IMMediate] :ERRor? :VERSion? :COMMunicate:GPIB:RDEVice:ADDRess :COMMunicate:GPIB:RDE
Chapter 4 Remote Interface Reference SCPI Command Summary Calibration Commands (see page 89 for more information) CALibration :COUNt? :CURRent[:DATA] :CURRent:LEVel {MIN|MID|MAX} :SECure:CODE :SECure:STATe {OFF|ON}, :SECure:STATe? :STRing :STRing? :VOLTage[:DATA] :VOLTage:LEVel {MIN|MID|MAX} :VOLTage:PROTection Status Reporting Commands (see page 101 for more information) STATus:QUEStionable :CONDition? [:EVENt]? :ENABle
Chapter 4 Remote Interface Reference SCPI Command Summary Interface Configuration Commands (see page 92 for more information) SYSTem :INTerface {GPIB|RS232} :LOCal :REMote :RWLock State Storage Commands (see page 88 for more information) *SAV {1|2|3|4|5} *RCL {1|2|3|4|5} MEMory:STATe :NAME {1|2|3|4|5} , :NAME? {1|2|3|4|5} 4 IEEE-488.
Chapter 4 Remote Interface Reference Simplified Programming Overview Simplified Programming Overview This section gives an overview of the basic techniques used to program the power supply over the remote interface. This section is only an overview and does not give all of the details you will need to write your own application programs. Refer to the remainder of this chapter and also chapter 6, ‘‘Application Programs’’, for more details and examples.
Chapter 4 Remote Interface Reference Simplified Programming Overview Reading a Query Response Only the query commands (commands that end with “ ? ”) will instruct the power supply to send a response message. Queries return either output values or internal instrument settings.
Chapter 4 Remote Interface Reference Simplified Programming Overview Power Supply Programming Ranges The SOURce subsystem requires parameters for programming values. The available programming value for a parameter varies according to the desired output range of the power supply. The following table lists the programming values available and MINimum, MAXimum, DEFault and reset values of your power supply. Refer to this table to identify programming values when programming the power supply. Table 4-1.
Chapter 4 Remote Interface Reference Using the APPLy Command Using the APPLy Command The APPLy command provides the most straightforward method to program the power supply over the remote interface. You can select the output voltage and current in one command. APPLy {| DEF | MIN | MAX}[,{| DEF | MIN | MAX}] This command is combination of VOLTage and CURRent commands.
Chapter 4 Remote Interface Reference Output Setting and Operation Commands Output Setting and Operation Commands This section describes low-level commands used to program the power supply. Although the APPLy command provides the most straightforward method to program the power supply, the low-level output setting commands give you more flexibility to change the individual parameters. CURRent{| MINimum | MAXimum | UP | DOWN} Program the immediate current level of the power supply.
Chapter 4 Remote Interface Reference Output Setting and Operation Commands CURRent:STEP? [DEFault] Return the value of the step size currently specified. The returned parameter is a numeric value. ‘‘DEFault’’ gives the minimum resolution of the step size in unit of amps. CURRent:TRIGgered {| MINimum | MAXimum} Program the pending triggered current level. The pending triggered current level is a stored value that is transferred to the output terminals when a trigger occurs.
Chapter 4 Remote Interface Reference Output Setting and Operation Commands VOLTage:STEP { | DEFault} Set the step size for voltage programming with the VOLT UP and VOLT DOWN commands. See the example below. To set the step size to the minimum resolution, set the step size to ‘‘DEFault’’. The minimum resolution of the step size is approximately 0.35 mV (E3640A), 1.14 mV (E3641A), 0.38 mV (E3642A), 1.14 mV (E3643A), 0.35 mV (E3644A), and 1.14mV (E3645A), respectively.
Chapter 4 Remote Interface Reference Output Setting and Operation Commands VOLTage:PROTection? [MINimum | MAXimum] Query the overvoltage protection trip level presently programmed. VOLTage:PROTection:STATe {0 | 1 | OFF | ON} Enable or disable the overvoltage protection function. At *RST, this value is set to ‘‘ON’’. VOLTage:PROTection:STATe? Query the state of the overvoltage protection function. The returned parameter is ‘‘0’’ (OFF) or ‘‘1’’ (ON).
Chapter 4 Remote Interface Reference Triggering Triggering The power supply’s triggering system allows a change in voltage and current when receiving a trigger, to select a trigger source, and to insert a trigger. Triggering the power supply is a multi-step process. • First, you must specify the source from which the power supply will accept the trigger. The power supply will accept a bus (software) trigger or an immediate trigger from the remote interface.
Chapter 4 Remote Interface Reference Triggering • To ensure synchronization when the bus source is selected, send the *WAI (wait) command. When the *WAI command is executed, the power supply waits for all pending operations to complete before executing any additional commands. For example, the following command string guarantees that the first trigger is accepted and is executed before the second trigger is recognized.
Chapter 4 Remote Interface Reference Triggering Triggering Commands INITiate Cause the trigger system to initiate. This command completes one full trigger cycle when the trigger source is an immediate and initiates the trigger subsystem when the trigger source is bus. TRIGger:DELay {| MINimum | MAXimum} Set the time delay between the detection of an event on the specified trigger source and the start of any corresponding trigger action on the power supply output. Select from 0 to 3600 seconds.
Chapter 4 Remote Interface Reference System-Related Commands System-Related Commands DISPlay {OFF | ON} Turn the front-panel display off or on. When the display is turned off, outputs are not sent to the display and all annunciators are disabled except the ERROR annunciator. The display state is automatically turned on when you return to the local mode. Store Press Local (Local) key to return to the local state from the remote interface. DISPlay? Query the front-panel display setting.
Chapter 4 Remote Interface Reference System-Related Commands OUTPut:RELay? Query the state of the TTL relay logic signals. SYSTem:BEEPer Issue a single beep immediately. SYSTem:ERRor? Query the power supply’s error queue. A record of up to 20 errors is stored in the power supply’s error queue. Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the first error that was stored.
Chapter 4 Remote Interface Reference System-Related Commands *RST Reset the power supply to its power-on state. The table below shows the state of the power supply after a RESET from the Recall menu or *RST command from the remote interface. Command CURR CURR:STEP CURR:TRIG DISP OUTP OUTP:REL TRIG:DEL TRIG:SOUR VOLT VOLT:STEP VOLT:TRIG VOLT:PROT VOLT:PROT:STAT VOLT:RANG E3640A state E3641A state E3642A state E3643A state E3644A state E3645A state 3A 0.8 A 5A 1.4 A 8A 2.2 A 0.052 mA 0.
Chapter 4 Remote Interface Reference State Storage Commands State Storage Commands The power supply has five storage locations in non-volatile memory to store power supply states. The locations are numbered 1 through 5. You can also assign a name to each of the locations (1 through 5) for use from the front panel. *SAV { 1 | 2 | 3 | 4 | 5 } Store (Save) the present state of the power supply to the specified location. Any state previously stored in the same location is overwritten (no error is generated).
Chapter 4 Remote Interface Reference Calibration Commands Calibration Commands See ‘‘Calibration Overview’’, starting on page 62 for an overview of the calibration features of the power supply. An example program for calibration is listed on page 91. For more detailed discussion on the calibration procedures, see the Service Information. Note When you calibrate the power supply, you should NOT set the OVP to ON state in order to prevent OVP from tripping.
Chapter 4 Remote Interface Reference Calibration Commands CALibration:SECure:STATe {OFF | ON}, Unsecure or secure the power supply with a security for calibration. CALibration:SECure:STATe? Query the secured state for calibration of the power supply. The returned parameter is ‘‘0’’ (OFF) or ‘‘1’’ (ON). CALibration:STRing Record calibration information about your power supply.
Chapter 4 Remote Interface Reference Calibration Commands Calibration Example 1 Enable the output of the power supply. ‘‘OUTP ON’’ 2 Disable the voltage protection function. ‘‘VOLT:PROT:STAT OFF’’ 3 Unsecure the power supply with the secure code before calibration. ‘‘CAL:SEC:STAT OFF, ‘’’’ 4 For voltage calibration, connect a digital voltmeter (DVM) across the power supply’s output terminals. 5 Set the power supply to low-end (MIN) calibration point.
Chapter 4 Remote Interface Reference Interface Configuration Commands Interface Configuration Commands See also "Configuring the Remote Interface" in chapter 3 starting on page 46. SYSTem:INTerface {GPIB | RS232} Select the remote interface. Only one interface can be enabled at a time. The GPIB interface is selected when the power supply is shipped from the factory. SYSTem:LOCal Place the power supply in the local mode during RS-232 operation. All keys on the front panel are fully functional.
Chapter 4 Remote Interface Reference The SCPI Status Registers The SCPI Status Registers All SCPI instruments implement status registers in the same way. The status system records various instrument conditions in three register groups: the Status Byte register, the Standard Event register, and the Questionable Status register groups. The status byte register records high-level summary information reported in the other register groups.
Chapter 4 Remote Interface Reference The SCPI Status Registers SCPI Status System QUEStionable Status Event Register Voltage Current Not Used Not Used Temperature Not Used Not Used Not Used Not Used Overvoltage Not Used Not Used Not Used Not Used Not Used Not Used Enable Registers 0 1 Output Buffer 4 "OR" + 9 Status Byte Summary Register STAT:QUES? STAT:QUES:ENAB STAT:QUES:ENAB? Operation Complete Query Error Device Depenent Error Execution Error Command Error Power On OPC Not Used QYE DD
Chapter 4 Remote Interface Reference The SCPI Status Registers The Questionable Status Register The Questionable Status register provides information about voltage and current regulation. Bit 0 is set when the voltage becomes unregulated, and bit 1 is set if the current becomes unregulated.
Chapter 4 Remote Interface Reference The SCPI Status Registers The Standard Event Register The Standard Event register reports the following types of instrument events: power-on detected, command syntax errors, command execution errors, selftest or calibration errors, query errors, or when an *OPC command is executed. Any or all of these conditions can be reported in the standard event summary bit (ESB, bit 5) of Status Byte register through the enable register.
Chapter 4 Remote Interface Reference The SCPI Status Registers The Standard Event register is cleared when: • You execute the *CLS (clear status) command. • You query the event register using the *ESR? (Event Status register) command. For example, 28 (4 + 8 + 16) is returned when you have queried the status of the Standard Event register, QYE, DDE, and EXE conditions have occurred. The Standard Event Enable register is cleared when: • You execute the *ESE 0 command.
Chapter 4 Remote Interface Reference The SCPI Status Registers The Status Byte Summary register is cleared when: • You execute the *CLS (clear status) command. • Querying the Standard Event register (*ESR? command) will clear only bit 5 in the Status Byte summary register. For example, 24 (8 + 16) is returned when you have queried the status of the Status Byte register, QUES and MAV conditions have occurred.
Chapter 4 Remote Interface Reference The SCPI Status Registers Using *STB? to Read the Status Byte The *STB? (Status Byte query) command is similar to a serial poll but it is processed like any other instrument command. The *STB? command returns the same result as a serial poll but the “request service” bit (bit 6) is not cleared. The *STB? command is not handled automatically by the IEEE-488 bus interface hardware and will be executed only after previous commands have completed.
Chapter 4 Remote Interface Reference The SCPI Status Registers To Determine When a Command Sequence is Completed 1 Send a device clear message to clear the power supply’s output buffer (e.g., CLEAR 705). 2 Clear the event registers with the *CLS (clear status) command. 3 Enable the “operation complete” bit (bit 0) in the Standard Event register by executing the *ESE 1 command. 4 Send the *OPC? (operation complete query) command and enter the result to ensure synchronization.
Chapter 4 Remote Interface Reference Status Reporting Commands Status Reporting Commands See diagram ‘‘SCPI Status System’’, on page 94 in this chapter for detailed information of the status register structure of the power supply. SYSTem:ERRor? Query the power supply’s error queue. A record of up to 20 errors is stored in the power supply’s error queue. Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the first error that was stored.
Chapter 4 Remote Interface Reference Status Reporting Commands *ESE? Query the Standard Event enable register. The power supply returns a decimal value which corresponds to the binary-weighted sum of all bits in the register. *ESR? Query the Standard event register. The power supply returns a decimal value which corresponds to the binary-weighted sum of all bits in the register. *OPC Set the ‘‘Operation Complete’’ bit (bit 0) of the Standard Event register after the command is executed.
Chapter 4 Remote Interface Reference An Introduction to the SCPI Language An Introduction to the SCPI Language SCPI (Standard Commands for Programmable Instruments) is an ASCIIbased instrument command language designed for test and measurement instruments. Refer to ‘‘Simplified Programming Overview’’, starting on page 74 for an introduction to the basic techniques used to program the power supply over the remote interface. SCPI commands are based on a hierarchical structure, also known as a tree system.
Chapter 4 Remote Interface Reference An Introduction to the SCPI Language Command Format Used in This Manual The format used to show commands in this manual is shown below: CURRent {|MINimum|MAXimum|UP|DOWN} The command syntax shows most commands (and some parameters) as a mixture of upper- and lower-case letters. The upper-case letters indicate the abbreviated spelling for the command. For shorter program lines, send the abbreviated form. For better program readability, send the long form.
Chapter 4 Remote Interface Reference An Introduction to the SCPI Language Command Separators A colon ( : ) is used to separate a command keyword from a lower-level keyword as shown below: ‘‘SOURce:CURRent:TRIGgered’’ A semicolon ( ; ) is used to separate two commands within the same subsystem, and can also minimize typing. For example, sending the following command string: ‘‘SOUR:VOLT MIN;CURR MAX’’ ...
Chapter 4 Remote Interface Reference An Introduction to the SCPI Language Querying Parameter Settings You can query the value of most parameters by adding a question mark (?) to the command.
Chapter 4 Remote Interface Reference An Introduction to the SCPI Language SCPI Parameter Types The SCPI language defines several different data formats to be used in program messages and response messages. Numeric Parameters Commands that require numeric parameters will accept all commonly used decimal representations of numbers including optional signs, decimal points, and scientific notation. Special values for numeric parameters like MINimum, MAXimum, and DEFault are also accepted.
Chapter 4 Remote Interface Reference Halting an Output in Progress Halting an Output in Progress You can send a device clear at any time to stop an output in progress over the GPIB interface. The status registers, the error queue, and all configuration states are left unchanged when a device clear message is received. Device clear performs the following actions. • The power supply’s input and output buffers are cleared. • The power supply is prepared to accept a new command string.
Chapter 4 Remote Interface Reference SCPI Conformance Information SCPI Conformance Information The power supply conforms to the ‘1996.0’ version of the SCPI standard. Many of the commands required by the standard are accepted by the power supply but are not described in this manual for simplicity or clarity. Most of these nondocumented commands duplicate the functionality of a command already described in this manual.
Chapter 4 Remote Interface Reference SCPI Conformance Information SCPI Confirmed Commands (continued) [SOURce] :VOLTage[:LEVel][:IMMediate][:AMPLitude] {|MIN|MAX|UP|DOWN} :VOLTage[:LEVel][:IMMediate][:AMPLitude]?[MIN|MAX] :VOLTage[:LEVel][:IMMediate]:STEP[:INCRement] {|DEFault} :VOLTage[:LEVel][:IMMediate]:STEP[:INCRement]? {DEFault} :VOLTage[:LEVel]:TRIGgered[:AMPLitude] {|MIN|MAX} :VOLTage[:LEVel]:TRIGgered[:AMPLitude]?[MIN|MAX] :VOLTage:PROTection[:LEVel] {|MIN|
Chapter 4 Remote Interface Reference SCPI Conformance Information Device Specific Commands The following commands are device-specific to your power supply. They are not included in the ‘1997.0’ version of the SCPI standard. However, these commands are designed with the SCPI standard in mind and they follow all of the command syntax rules defined by the standard.
Chapter 4 Remote Interface Reference IEEE-488 Conformance Information IEEE-488 Conformance Information Dedicated Hardware Lines ATN IFC REN SRQ Attention Interface Clear Remote Enable Service Request Enable Addressed Commands DCL EOI GET GTL LLO SDC SPD SPE 112 Device Clear End or Identify Group Execute Trigger Go To Local Local Lockout Selected Device Clear Serial Poll Disable Serial Poll Enable IEEE-488 Common Commands *CLS *ESE *ESE? *ESR? *IDN? *OPC *OPC? *PSC {0|1} *PSC? *RST *S
5 Error Messages
Error Messages Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the first error that was stored. Errors are cleared as you read them. When you have read all errors from the queue, the ERROR annunciator turns off and the errors are cleared. The power supply beeps once each time an error is generated. If more than 20 errors have occurred, the last error stored in the queue (the most recent error) is replaced with -350, ‘‘Queue overflow’’.
Chapter 5 Error Messages Execution Errors Execution Errors -101 Invalid character An invalid character was found in the command string. You may have inserted a character such as #, $, or % in the command keyword or within a parameter. Example: OUTP:STAT #ON -102 Syntax error Invalid syntax was found in the command string. You may have inserted a blank space before or after a colon in the command header, or before a comma.
Chapter 5 Error Messages Execution Errors -112 Program mnemonic too long A command header was received which contained more than the maximum 12 characters allowed. -113 Undefined header A command was received that is not valid for this power supply. You may have misspelled the command or it may not be a valid command. If you are using the short form of the command, remember that it may contain up to four letters.
Chapter 5 Error Messages Execution Errors -141 Invalid character data Either the character data element contained an invalid character or the particular element received was not valid for the header. -144 Character data too long The character data element contained too many characters. -148 Character data not allowed A discrete parameter was received but a character string or a numeric parameter was expected. Check the list of parameters to verify that you have used a valid parameter type.
Chapter 5 Error Messages Execution Errors -221 Settings conflict Indicates that a legal program data element was parsed but could not be executed due to the current device state. -222 Data out of range A numeric parameter value is outside the valid range for the command. Example: TRIG:DEL -3 -223 Too much data A character string was received but could not be executed because the string length was more than 40 characters. This error can be generated by the CALibration:STRing command.
Chapter 5 Error Messages Execution Errors -420 Query UNTERMINATED The power supply was addressed to talk (i.e., to send data over the interface) but a command has not been received which sends data to the output buffer. For example, you may have executed an APPLy command (which does not generate data) and then attempted an ENTER statement to read data from the remote interface.
Chapter 5 Error Messages Self-Test Errors Self-Test Errors The following errors indicate failures that may occur during a self-test. Refer to the Service Information for more information.
Chapter 5 Error Messages Calibration Errors Calibration Errors The following errors indicate failures that may occur during a calibration. Refer to the Service Information for more information. 701 Cal security disabled by jumper The calibration security feature has been disabled with a jumper inside the power supply. When applicable, this error will occur at power-on to warn you that the power supply is unsecured. 702 Cal secured The power supply is secured against calibration.
Chapter 5 Error Messages Calibration Errors 713 Bad readback cal data The specified readback calibration values (CAL:VOLT or CAL:CURR) are out of range. Note that the new calibration constants are not stored in the nonvolatile memory. 714 Bad OVP cal data The overvoltage protection calibration constant is out of range. Note that the new calibration constants are not stored in the non-volatile memory. 717 Cal OVP status enabled Overvoltage protection status is enabled.
6 Application Programs
Application Programs This chapter contains two application programs that utilize the remote interface. These examples will help you develop programs for your own application. Chapter 4 “Remote Interface Reference” starting on page 67 lists the syntax for the SCPI (Standard Commands for Programmable Instruments) commands available to program the power supply. The examples in this chapter have been tested on a PC running WindowsÒ 3.1, WindowsÒ 95 or WindowsÒ NT 4.0.
Chapter 6 Application Programs Example Program for C and C++ Example Program for C and C++ The following C programming example shows you how to send and receive formatted I/O. This example programming shows you how to use the SCPI commands for the instrument with the VISA functionality and does include error trapping. For more information on non-formatted I/O and error trapping, refer to the Agilent Technologies VISA User’s Guide.
Chapter 6 Application Programs Example Program for C and C++ OpenPort(); /* Query the power supply id, read response and print it */ sprintf(Buffer,"*IDN?"); SendSCPI(Buffer); printf("Instrument identification string:\n %s\n\n",Buffer); SendSCPI("*RST"); SendSCPI("Current 2"); SendSCPI("Output on"); printf("Voltage /* Set power-on condition /* Set current limit to 2A /* Turn output on Current\n\n"); */ */ */ /* Print heading */ /*Step from 0.6 to 0.8 volt in 0.02 steps */ for(voltage = 0.
Chapter 6 Application Programs Example Program for C and C++ if(bGPIB){ /* For use with GPIB 7 address, use "GPIB::7::INSTR" address format */ strcpy(VISA_address,"GPIB::"); strcat(VISA_address,GPIB_Address); strcat(VISA_address,"::INSTR"); } else{ /* For use with COM2 port, use "ASRL2::INSTR" address format */ strcpy(VISA_address,"ASRL"); strcat(VISA_address,COM_Address); strcat(VISA_address,"::INSTR"); } /* Open communication session with the power supply */ ErrorStatus = viOpenDefaultRM(&defaultRM); Err
Chapter 6 Application Programs Example Program for C and C++ void CheckError(char* pMessage) { if (ErrorStatus < VI_SUCCESS){ printf("\n %s",pMessage); ClosePort(); exit(0); } } void delay(clock_t wait) { clock_t goal; goal = wait + clock(); while( goal > clock() ) ; } End of Program 128
Chapter 6 Application Programs Example Program for Excel 97 Example Program for Excel 97 This section contains the example program written using Excel Macros (Visual BasicÒ for Applications) to control your power supply. With Excel you can take the value of a cell in a spread sheet, send it to the power supply, and then record the response on the worksheet. The example on the following pages characterizes a component across the terminals of the power supply.
Chapter 6 Application Programs Example Program for Excel 97 To write an Excel macro you must first open a module in Excel. Go to the View menu, choose Toolbars, and then select Control Toolbox. The Control Toolbox dialog box appears. Select the Command button in the dialog box. Click cell A1 and drag across the cell B3. The “CommandButton1” box is created. To change the button name, click the right mouse button on that button and then select Properties. The Properties dialog box appears.
Chapter 6 Application Programs Example Program for Excel 97 Diode Macro '""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" ' This is the subroutine first executed. Modify this routine to suit ' your needs. To change the GPIB address, go to the module OpenPort, and ' change the variable GPIB_Address = "5” to the required GPIB address.
Chapter 6 Application Programs Example Program for Excel 97 '********************************************************************************* ' This routine send a SCPI command string to the GPIB port or RS-232 port.
Chapter 6 Application Programs Example Program for Excel 97 Declaration for Windows 3.1 '************************************************************************************ ' This routine requires the file VISA.dll. It typically resides in the ' c:\windows\system directory. Additional declations for VISA.DLL are usally in file ' visa.bas under c:\vxipnp\win31\include directory on your PC. This routine uses the ' VTL Library to send commands to an instrument.
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7 Tutorial
Tutorial This chapter describes basic operation of linear power supply and operation of this power supply. You will also find information to help you better understand output characteristics of this power supply as well as an ideal power supply.
Chapter 7 Tutorial Overview of this Power Supply Operation Overview of this Power Supply Operation The basic design model for power supplies consists of placing a control element in series with the rectifier and load device. Figure 7-1 shows a simplified schematic of a series regulated supply with the phase-controlled pre-regulator described as a power switch and the series element depicted as a variable resistor.
Chapter 7 Tutorial Overview of this Power Supply Operation In terms of performance, a linear regulated supply has a very precise regulating properties and responds quickly to variations of the line and load. Hence, its line and load regulation and transient recovery time are superior to supplies using other regulation techniques. The power supply also exhibits low ripple and noise, is tolerant of ambient temperature changes, and with its circuit simplicity, has a high reliability.
Chapter 7 Tutorial Output Characteristics Output Characteristics An ideal constant-voltage power supply would have a zero output impedance at all frequencies. Thus, as shown in Figure 7-3, the voltage would remain perfectly constant in spite of any changes in output current demanded by the load. Figure 7-3. Ideal Constant Voltage Power Supply Figure 7-4. Ideal Constant Current Power Supply The ideal constant-current power supply exhibits an infinite output impedance at all frequencies.
Chapter 7 Tutorial Output Characteristics Figure 7-5 shows the operating modes of the output of this power supply. The operating point of one supply will be either above or below the line RL = RC. This line represents a load where the output voltage and the output current are equal to the voltage and current setting. When the load RL is greater than RC, the output voltage will dominate since the current will be less then the current setting. The power supply is said to be in constant voltage mode.
Chapter 7 Tutorial Output Characteristics Unregulated State If the power supply should go into a mode of operation that is neither CV or CC, the power supply is unregulated. In this mode the output is not predictable. The unregulated condition may be the result of the ac line voltage below the specifications. The unregulated condition may occur momentarily.
Chapter 7 Tutorial Output Characteristics NORMAL MODE NOISE OUTPUT VOLTAGE R <5mVpp* <0.5mVrms* <8mVpp** <1mVrms** OUTPUT TERMINAL COMMON MODE NOISE <1.5 uArms *E3640A/41A/44A models **E3641A/43A/45A models Figure 7-6. Simplified Diagram of Common Mode and Normal Mode Sources of Noise When the load changes very rapidly, as when a relay contact is closed, the inductance in the hook up wire and in the power supply output will cause a spike to appear at the load.
Chapter 7 Tutorial Extending the Voltage and Current Range Extending the Voltage and Current Range The power supply may be able to provide voltages and currents greater than its rated maximum outputs if the power-line voltage is at or above its nominal value. Operation can be extended up to 3% over the rated output without damage to the power supply, but performance can not be guaranteed to meet specifications in this region.
Chapter 7 Tutorial Remote Programming Remote Programming During remote programming a constant-voltage regulated power supply is called upon to change its output voltage rapidly. The most important factor limiting the speed of output voltage change is the output capacitor and load resistor. Figure 7-7. Speed of Response - Programming Up (Full Load) The equivalent circuit and the nature of the output voltage waveform when the supply is being programmed upward are shown in Figure 7-8.
Chapter 7 Tutorial Remote Programming If no load resistor is attached to the power supply output terminal, then the output voltage will rise linearly at a rate of CO/IL when programmed upward, and TR = CO(E2 -E1)/IL, the shortest possible up-programming time. Figure 7-8. Speed of Response - Programming Down Figure 7-8 shows that when the power supply is programmed down, the regulator senses that the output voltage is higher than desired and turns off the series transistors entirely.
Chapter 7 Tutorial Remote Programming 146
8 Specifications
Specifications The performance specifications are listed in the following pages. Specifications are warranted in the temperature range of 0 to 40°C with a resistive load. Supplemental characteristics, which are not warranted but are descriptions of performance determined either by design or testing. The Service Information contains procedures for verifying the performance specifications.
Chapter 8 Specifications Performance Specifications Performance Specifications Table 8-1 Performance Specifications Parameter Output Ratings (@ 0 °C - 40 °C) Programming Accuracy [1] 12 months (@ 25 °C ± 5 °C), ±(% of output + offset) Readback Accuracy[1] 12 months (over GPIB and RS-232 or front panel with respect to actual output (@ 25 °C ± 5 °C), ±(% of output + offset) Ripple and Noise (with outputs ungrounded, or with either output terminal grounded, 20 Hz to 20 MHz) Load Regulation, ±(% of output +
Chapter 8 Specifications Performance Specifications Transient Response Time Less than 50 msec for output to recover to within 15 mV following a change in output current from full load to half load or vice versa Settling Time Less than 90 msec for the output voltage to change from 1% to 99% or vice versa following the receipt of VOLTage or APPLy command via direct GPIB or RS-232 interface. OVP Accuracy, ±(% of output + offset) <0.5% + 0.
Chapter 8 Specifications Supplemental Characteristics Supplemental Characteristics Table 8-2. Supplemental Characteristics Parameter Output Low Programming Range Range High (maximum Range programmable OVP values) E3640A 0 to +8.24 V/ 0 to 3.09 A 0 to +20.6 V/ 0 to 1.545 A 1 V to 22 V E3641A 0 to +36.05 V/ 0 to 0.824 A 0 to +61.8V/ 0 to 0.515 A 1 V to 66 V E3642A 0 to +8.24 V/ 0 to 5.15 A 0 to +20.6V/ 0 to 2.575 A 1 V to 22 V E3643A 0 to +36.05 V/ 0 to 1.442 A 0 to +61.8V/ 0 to 0.
Chapter 8 Specifications Supplemental Characteristics Programming Language SCPI (Standard Commands for Programmable Instruments) State Storage Memory Five (5) user-configurable stored states Recommended Calibration Interval 1 year Output Terminal Isolation (maximum, from chassis ground) ±60 Vdc when connecting shorting conductors without insulation between the (+) output and the (+) sense terminals and between the (-) output and the (-) sense terminals.
Chapter 8 Specifications Supplemental Characteristics Storage Temperature -20 to 70 °C for storage environment. Environmental Conditions Designed for indoor use in an installation category II, pollution degree 2 environment. Designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Weight E3640A E3641A E3642A E3643A E3644A E3645A Net 5.3 Kg 5.2 Kg 6.3 Kg 6.2 Kg 6.6 Kg 6.7 Kg Shipping 7.2 Kg 7.1 Kg 8.2 Kg 8.1 Kg 8.5 Kg 8.6 Kg Dimensions* 212.
Chapter 8 Specifications Supplemental Characteristics Figure 8-2.
Appendix Service Information
Service Information This chapter contains procedures to verify that the power supply is operating normally and is within published specifications (See page 147). The power supply must pass the complete self-test before calibration or any of the verification or performance tests can be performed. If the supply fails any of the tests or if abnormal test results are obtained, refer to the troubleshooting hints in this document.
Service Information Appendix Service Information Operating Checklist Operating Checklist Before returning your power supply to Agilent Technologies for service or repair check the following items: Is the Power Supply Inoperative? Verify that the ac power cord is connected to the power supply. Verify that the front-panel power switch has been pushed. Verify that the power-line fuse is installed and not open (See page 20): Verify the power-line voltage setting.
Appendix Service Information Types of Service Available Types of Service Available If your power supply fails within three years of original purchase, Agilent Technologies will repair or replace it free of charge. If your unit fails after your three year warranty expires, Agilent Technologies will repair or replace it as a very competitive price. Agilent will make the decision locally whether to repair or replace your unit. Standard Repair Service (worldwide) Contact your nearest Agilent Service Center.
Service Information Appendix Service Information Repacking for Shipment Repacking for Shipment For the Express Exchange Service described on the previous page, return your failed power supply to the designated Agilent Service Center using the shipping carton of the exchange unit. A shipping label will be supplied. Agilent will notify you when your failed unit has been received.
Appendix Service Information Electrostatic Discharge (ESD) Precautions Electrostatic Discharge (ESD) Precautions Almost all electrical components can be damaged by electrostatic discharge (ESD) during handling. Component damage can occur at electrostatic discharge voltages as low as 50 volts. The following guidelines will help prevent ESD damage when serving the power supply or any electronic device. • Disassemble instruments only in a static-free work area.
Service Information Appendix Service Information Troubleshooting Hints Troubleshooting Hints This section provides a brief check list of common failures. Before troubleshooting or repairing the power supply, make sure that the failure is in the power supply rather than any external connections. Also make sure that the power supply is accurately calibrated. The power supply’s circuits allow troubleshooting and repair with basic equipment such as a 6½-digital multimeter.
Appendix Service Information Self-Test Procedures Self-Test Procedures Power-On Self-Test Each time the power supply is powered on, a set of self-tests are performed. These tests check that the minimum set of logic and measurement hardware are functioning properly. Failures during the power-on self-test utilize error codes 601 through 604 and 624 through 632.
Service Information Appendix Service Information Self-Test Procedures 606 Rundown gain out of range This test checks the nominal gain between the integrating ADC and the U121 on-chip ADC. The nominal gain is checked to ±10% tolerance. 607 Rundown too noisy This test checks the gain repeatability between the integrating ADC and the U121 on-chip ADC. The gain test (606) is performed eight times. Gain noise must be less that ±64 lsb’s of the U121 on-chip ADC.
Appendix Service Information General Disassembly General Disassembly 164
Service Information Appendix Service Information Recommended Test Equipment Recommended Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, use the accuracy requirements shown to select substitute calibration standards. If you use equipment other than that recommended in Table A-2, you must recalculate the measurement uncertainties for the actual equipment used.
Appendix Service Information Test Considerations Test Considerations To ensure proper power supply operation, verify that you have selected the correct power-line voltage prior to attempting any test procedure in this chapter. See page 21 for line voltage conversion. Ensure that all connections of terminals (both front panel and rear panel) are removed while the power supply internal self-test is being performed.
Service Information Appendix Service Information Measurement Techniques Measurement Techniques Setup for Most Tests Most tests are performed at the front terminals as shown in Figure A-1. Measure the dc voltage directly at the (+) and (-) terminals on the front panel.
Appendix Service Information Measurement Techniques General Measurement Techniques To achieve best results when measuring load regulation, peak to peak voltage, and transient response time of the power supply, measuring devices must be connected through the hole in the neck of the binding post at (A) while the load resistor is plugged into the front of the output terminals at (B). A measurement made across the load includes the impedance of the leads to the load.
Service Information Appendix Service Information Constant Voltage (CV) Verifications Constant Voltage (CV) Verifications Constant Voltage Test Setup If more than one meter or if a meter and an oscilloscope are used, connect each to the (+) and (-) terminals by a separate pair of leads to avoid mutual coupling effects. Use coaxial cable or shielded 2-wire cable to avoid noise pick-up on the test leads.
Appendix Service Information Constant Voltage (CV) Verifications 5 Readback the output voltage over the remote interface by sending the command: MEAS:VOLT? 6 Record the value displayed on the controller. This value should be within the limit of (DVM ±5 mV). 7 Program the output voltage to full scale rated value (20 V)† by sending the command: VOLT 20.0 (E3640A model) 8 Record the output voltage reading on the digital voltmeter (DVM).
Service Information Appendix Service Information Constant Voltage (CV) Verifications CV Source effect (Line Regulation) This test measures the change in output voltage that results from a change in ac line voltage from the minimum value (10% below the nominal input voltage) to maximum value (10% above the nominal input voltage). 1 Turn off the power supply and connect a digital voltmeter between the (+) and (-) terminals of the output to be tested as shown in Figure A-1.
Appendix Service Information Constant Voltage (CV) Verifications RMS voltmeter BNC Receptacle RMS voltmeter Input BNC Cable Split Ferrites* Input Load Resistor Load Resistor (Front Panel Connections) (Rear Panel Connections) 1 Turn off the power supply and connect the output to be tested as shown in Figure A-1 to an oscilloscope (ac coupled) between (+) and (-) terminals. Set the oscilloscope to AC mode and bandwidth limit to 20 MHz. Connect a resistive load (13.
Service Information Appendix Service Information Constant Voltage (CV) Verifications Load Transient Response Time This test measures the time for the output voltage to recover to within 15 mV of nominal output voltage following a load change from full load to half load, or half load to full load. 1 Turn off the power supply and connect the output to be tested as shown in Figure A-1 with an oscilloscope. Operate the electronic load in constant current mode. 2 Turn on the power supply.
Appendix Service Information Constant Current (CC) Verifications Constant Current (CC) Verifications Constant Current Test Setup Follow the general setup instructions in the General Measurement Techniques‚ on page 168, and the specific instructions will be given in the following paragraphs. Current Programming and Readback Accuracy This test verifies that the current programming and GPIB or RS-232 readback functions are within specifications.
Service Information Appendix Service Information Constant Current (CC) Verifications 6 Record the value displayed on the controller. This value should be within the limit of (IO ± 5 mA). 7 Program the output current to the full scale rated value (3 A)† by sending the command: CURR 3.0 (E3640A model) 8 Divide the voltage drop (DVM reading) across the current monitoring resistor (RM) by its resistance to convert to amps and record this value (IO).
Appendix Service Information Constant Current (CC) Verifications 4 Operate the electronic load in short (input short) mode. Record the current reading again by dividing the voltage reading on the digital voltmeter by the resistance of the current monitoring resistor. The difference between the current readings in step (3) and (4) is the load regulation current. The difference of the readings should be within the limit of: E3640A E3641A E3642A E3643A E3644A E3645A 0.55 mA 0.33 mA 0.75 mA 0.
Service Information Appendix Service Information Constant Current (CC) Verifications CC PARD (Ripple and Noise) Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac current, as well, as an ac voltage superimposed on the dc output. CC PARD is specified as the rms output current in a frequency range 20 Hz to 20 MHz with the power supply in constant current operation.
Appendix Service Information Common Mode Current Noise Common Mode Current Noise The common mode current is that ac current component which exists between the output or output lines and chassis ground. Common mode noise can be a problem for very sensitive circuitry that is referenced to earth ground. When a circuit is referenced to earth ground, a low level line-related ac current will flow from the output terminals to earth ground.
Service Information Appendix Service Information Performance Test Record for Your Power Supply Performance Test Record for Your Power Supply CV Performance Test Record Models Upper Limit Lower Limit CV Programming Accuracy @ 0 volts (DVM reading) all +0.0100 V -0.0100 V CV Readback Accuracy @ 0 volts all DVM +0.0050 V DVM -0.0050 V CV Programming Accuracy @ Full Scale (DVM reading) E3640A/42A/44A +20.0200 V +19.9800 V E3641A/43A/45A +60.0400 V +59.
Appendix Service Information Performance Test Record for Your Power Supply CC Performance Test Record Test Description Models Actual Result Specifications Upper Limit Lower Limit CC Programming Accuracy @ 0 amps (IO) all +0.0100 A -0.0100 A CC Readback Accuracy @ 0 amps all IO + 0.0050 A IO - 0.0050 A (E3640A) 3.01600 A 2.9840 A (E3641A) 0.8116 A 0.7884 A (E3642A) 5.02 A 4.98 A (E3643A) 1.4128 A 1.3872 A (E3644A) 8.026 7.
Service Information Appendix Service Information Calibration Reference Calibration Reference Before you calibrate the power supply, you must unsecure it by entering the correct security code. See “Calibration Overview”, starting on page 62, for more detailed procedures to unsecure or secure the power supply. Agilent Technologies Calibration Services When your power supply is due for calibration, contact your local Agilent Technologies Service Center for a low-cost calibration.
Appendix Service Information General Calibration/Adjustment Procedure General Calibration/Adjustment Procedure Note The power supply should be calibrated after 1-hour warm-up with no load connected. And Perform the voltage calibration prior to the OVP calibration. The front panel calibration procedures are described in this section. • For voltage calibration, disconnect all loads from the power supply and connect a DVM across the output terminals.
Service Information Appendix Service Information General Calibration/Adjustment Procedure Front Panel Voltage and Current Calibration Note Before attempting to calibrate the power supply, you must unsecure the power supply, and disconnect all loads from the power supply and connect a DVM across the output terminals. See “Calibration Overview”, starting on page 62 to unsecure.
Appendix Service Information General Calibration/Adjustment Procedure View Calibrate 5 Save the changes and select the middle voltage calibration point. V MI 10 0.000 If the entered number is within an acceptable range, an ‘‘ENTERED’’ message appears for a second. If the entered number is not correct, an error message will be displayed for a second and you will hear a beep, and then go back to the low, middle, or high voltage calibration point again as proceeding.
Service Information Appendix Service Information General Calibration/Adjustment Procedure View Calibrate 10 Run the OVP calibration. CALibrating Above message is displayed to indicate that the calibration is progressing. It takes approximately 10 seconds to complete the calibration. If the calibration fails, an error message will be displayed for a second and you will hear a beep, and then go back to the OVP calibration mode again. Current Calibration Connect an appropriate shunt 0.
Appendix Service Information General Calibration/Adjustment Procedure View Calibrate 13 Save the changes and select the middle current calibration point. I MI 1.5 5000 If the entered number is within an acceptable range, an ‘‘ENTERED’’ message appears for a second. If the entered number is not correct, an error message will be displayed for a second and you will hear a beep, and then go back to the low, middle, or high current calibration point again as proceeding.
Service Information Appendix Service Information Calibration Record for Your Power Supply Calibration Record for Your Power Supply Step Calibration Description 1 Turn on the calibration mode by holding down the "Calibrate" key as you turn on the power supply until you hear a long beep. 2 Unsecure the power supply if secured. (See page 62) 3 Press "Calibrate" key to move down menu to voltage calibration menu. A "VOLTAGE CAL" is displayed.
Appendix Service Information Calibration Error Messages Calibration Error Messages The following tables are abbreviated lists of error messages for the E3640A, E3641A, E3642A, E3643A, E3644A, and E3645A. The errors listed below are the most likely errors to be encountered during calibration and adjustment. A more complete list of error messages and descriptions is contained in chapter 5.
Service Information Appendix Service Information Replaceable Parts Replaceable Parts This chapter contains information ordering replacement parts for your power supply. • E3640A/41A/42A/43A/44A/45A Power Supply Assembly‚ on page 190 • Manufacturer’s List‚ on page 191 The parts lists include a brief description of the part with applicable Agilent part numbers and manufacturer part number.
Appendix Service Information Replaceable Parts E3640A/41A/42A/43A/44A/45A Power Supply Assembly Reference Agilent Part Q’ty Designator Number F100-F102 S102 0699-2715 3 Part Description FUSIBLE RES 1 OHM 5% 1/2W Mfr. code Mfr. Part Number 01542 FN1/2 3101-2976 1 SW-PB DPST 6A 250V 04486 NE18-2A-EE-SP 8120-8767 1 POWER CORD FOR STD/0E9 GY-062 or 22631 SP-305+IS-14 8120-8768 1 POWER CORD FOR 0E3 GY-062 22631 SP-022+IS-14 (E3640A/41A) 2110-1069 1 FUSE 1.
Service Information Appendix Service Information Replaceable Parts Manufacturer’s List Mfr.
Appendix Service Information Replaceable Parts 192
Index If you have questions relating to the operation of the power supply, call 1-800-452-4824 in the United States, or contact your nearest Agilent Technologies Sales Office.
Index D I M device specific commands 111 dimensions of power supply 153 distribution terminals 38 down-programming response 145 dummy load resistor 36 ideal constant-current power supply 139 ideal constant-voltage power supply 139 ideal power supply 141 IEEE-488 conformance information 112 IEEE-488.
Index programming language 152 programming ranges (voltage/current) 76 programming resolution 149 Q query data 97 query response reading 75 questionable status register 95 R safety information 29 SCPI command terminators 106 confirmed commands 109, 110 conformance information 109 device-specific 111 language introduction 103 non-SCPI commands 111 status registers 93 version 57, 109 version query 57 SCPI parameters Boolean 107 Discrete 107 Numeric 107 String 107 scrolling speed, error text 114 self-test
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