Manual

ManualsBrandsKEPCO ManualsPower suppliersBHK-MG 40W (Half Rack) Series

IMPORTANT NOTES:

1) This manual is valid for the following Model and associated serial numbers:

MODEL SERIAL NO. REV. NO.

2) A Change Page may be included at the end of the manual. All applicable changes and

revision number changes are documented with reference to the equipment serial num-

bers. Before using this Instruction Manual, check your equipment serial number to identify

your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Docu-

mentation Office in New York, (718) 461-7000, requesting the correct revision for your par-

ticular model and serial number.

3) The contents of this manual are protected by copyright. Reproduction of any part can be

made only with the specific written permission of Kepco, Inc.

Data subject to change without notice.

KEPCO®

THE POWER SUPPLIER™

MODEL

OPERATOR’S MANUAL

ORDER NO. REV. NO.

KEPCO, INC. ! 131-38 SANFORD AVENUE ! FLUSHING, NY. 11355 U.S.A. ! TEL (718) 461-7000 ! FAX (718) 767-1102

email: hq@kepcopower.com ! World Wide Web: http://www.kepcopower.com

KEPCO INC.

An ISO 9001 Company.

SERIES BHK-MG

40 WATT POWER SUPPLY

1/2 RACK VOLTAGE/CURRENT-STABILIZED DC SOURCE

BHK-MG 40 WATT

POWER SUPPLY

P/N 243-0970-L

Summary of content (148 pages)

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OPERATOR’S MANUAL SERIES BHK-MG 40 WATT POWER SUPPLY 1/2 RACK VOLTAGE/CURRENT-STABILIZED DC SOURCE KEPCO INC. An ISO 9001 Company. MODEL BHK-MG 40 WATT POWER SUPPLY ORDER NO. REV. NO. IMPORTANT NOTES: 1) This manual is valid for the following Model and associated serial numbers: MODEL SERIAL NO. REV. NO. 2) A Change Page may be included at the end of the manual. All applicable changes and revision number changes are documented with reference to the equipment serial numbers.
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Declaration of Conformity Application of Council directives: 73/23/EEC (LVD) 93/68/EEC (CE mark) Standard to which Conformity is declared: EN61010-1:2001 (Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1) Manufacturer's Name and Address: KEPCO INC. 131-38 SANFORD AVENUE FLUSHING, N.Y. 11355 USA Importer's Name and Address: OPY C E V I T A T N REPRESE Type of Equipment: Component Power Supply Model No.
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Conditions of Conformance When this product is used in applications governed by the requirements of the EEC, the following restrictions and conditions apply: 1. For European applications, requiring compliance to the Low Voltage Directive, 73/23/EEC, this power supply is considered a component product, designed for “built in“ applications.
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SAFETY INSTRUCTIONS 1. Installation, Operation and Service Precautions This product is designed for use in accordance with EN 61010-1 and UL 3101 for Installation Category 2, Pollution Degree 2. Hazardous voltages are present within this product during normal operation.
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TABLE OF CONTENTS SECTION PAGE SECTION 1 - INTRODUCTION 1.1 1.2 1.3 1.4 1.4.1 1.4.2 1.4.2.1 1.4.2.2 1.4.2.3 1.4.3 1.4.4 1.4.5 1.4.6 1.4.7 1.4.8 1.4.9 1.4.10 1.4.11 1.4.12 1.5 1.6 1.7 Scope of Manual ..................................................................................................................................... 1-1 General Description................................................................................................................................. 1-1 Specifications ....
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TABLE OF CONTENTS SECTION 3.2.2 3.2.3 3.2.4 3.2.5 3.2.6 3.2.7 3.2.7.1 3.2.7.2 3.2.7.3 3.2.7.4 3.2.8 3.2.8.1 3.2.9 3.2.10 3.2.11 3.2.12 3.2.13 3.2.14 3.2.15 3.2.15.1 3.2.15.1.1 3.2.15.1.2 3.2.15.2 3.2.15.3 3.2.15.4 3.2.15.5 3.2.15.6 3.2.15.7 3.2.16 3.3 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.5.1 3.3.5.2 3.4 3.5 3.5.1 3.5.2 3.5.3 3.5.3.1 3.5.3.2 3.5.3.3 3.5.4 3.6 3.6.1 3.6.2 3.7 3.7.1 3.7.2 3.7.3 3.7.3.1 3.7.3.2 3.7.3.3 3.7.3.4 3.7.3.5 ii PAGE Turning the Power Supply On.........................................
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TABLE OF CONTENTS SECTION PAGE 3.7.3.6 Instrument Subsystem ................................................................................................................. 3-24 3.7.3.7 STATus Subsystem ..................................................................................................................... 3-24 3.7.3.8 System Subsystem ...................................................................................................................... 3-24 3.7.3.9 TRIGger subsystem ........
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TABLE OF CONTENTS SECTION 4.6 4.7 4.8 4.9 PAGE Changing the Calibration Password ....................................................................................................... Restoring Previous Calibration Values ................................................................................................... Restoring Factory Calibration Values ..................................................................................................... Calibration Storage ...........................
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TABLE OF CONTENTS SECTION B.32 B.33 B.34 B.35 B.36 B.37 B.38 B.39 B.40 B.41 B.42 B.43 B.44 B.45 B.46 B.47 B.48 B.49 B.50 B.51 B.52 B.53 B.54 B.55 B.56 B.57 B.58 B.59 B.60 B.61 B.62 B.63 B.64 B.65 B.66 B.67 B.68 B.69 B.70 B.71 B.72 B.73 B.74 B.75 B.76 B.77 B.78 B.79 B.80 B.81 B.82 B.83 B.84 B.85 B.86 B.87 B.88 B.89 B.90 PAGE [SOURce:]LIST:VOLTage? Query .......................................................................................................... [SOURce:]LIST:VOLTage:POINts? Query ...........
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LIST OF FIGURES FIGURE 1-1 1-2 1-3 2-1 2-2 2-3 2-4 2-5 2-6 2-7 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10 3-11 3-12 3-13 3-14 3-15 3-16 3-17 3-18 3-19 3-20 3-21 3-22 3-23 3-24 3-25 4-1 4-2 4-3 A-1 B-1 B-2 B-3 B-4 B-5 B-6 B-7 vi TITLE PAGE BHK-MG 40W Series Programmable Power Supply..................................................................................... x BHK 40W Series Power Supply, Mechanical Outline Drawing ..................................................................
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LIST OF TABLES TABLE 1-1 1-2 1-3 1-4 1-5 1-6 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10 4-1 4-2 4-3 A-1 A-2 A-3 B-1 B-2 B-3 B-4 TITLE PAGE Model Parameters .......................................................................................................................................1-2 BHK-MG 40W Specifications ......................................................................................................................
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SERVICE SAFETY INSTRUCTIONS Read these safety instructions, as well as the applicable installation, operating and servicing instructions contained in this manual before using the power supply. WARNING Do not touch the output terminals. The high voltage output is dangerous. Electric shock can cause injury or death. Do not remove the cover or disassemble the unit. There are no operator serviceable components or adjustments inside the unit.
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FIGURE 1-1.
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SECTION 1 - INTRODUCTION 1.1 SCOPE OF MANUAL This manual contains instructions for the installation, operation and service of the Half Rack BHK-MG 40W series of output power stabilized voltage or current, d-c power supplies manufactured by KEPCO, Inc., Flushing, New York, U.S.A. WARNING DANGEROUS AND LETHAL POTENTIALS ARE PRESENT, BOTH WITHIN THIS POWER SUPPLY, AND AT THE OUTPUT! Before proceeding to use the power supply, read this manual very carefully.
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1.3 SPECIFICATIONS Table 1-1 lists the parameters applicable to individual models. Table 1-2 lists general specifications applicable to all models except where otherwise noted. TABLE 1-1.
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TABLE 1-2. BHK-MG 40W SPECIFICATIONS (Continued) SPECIFICATION RATING/DESCRIPTION CONDITION OUTPUT CHARACTERISTICS (CONTINUED) Load effect Temperature effect (per degree C) Voltage 0.005% EO max no load - full load Current 0.015% IO max short - full load Voltage 0.01% EO max Ambient temperature 0 to 50° C Current 0.02% IO max Time effect Voltage 0.01% EO max Ripple (rms/p-p) (Slow Mode) Voltage: 0.004% / 0.04% EO max Current 0.
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TABLE 1-2. BHK-MG 40W SPECIFICATIONS (Continued) SPECIFICATION RATING/DESCRIPTION CONDITION OUTPUT CHARACTERISTICS (CONTINUED) Withstand voltage (All models) 1350V a-c/1 min BHK 300-130MG 1950V d-c/1 min Between shorted inputs and chassis Between shorted outputs and chassis. BHK 500-80MG 2250V d-c/1 min BHK 1000-40MG BHK 2000-20MG 2800V d-c/1 min Chassis connection to ground resistance 0.1 Ohm max.
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TABLE 1-2. BHK-MG 40W SPECIFICATIONS (Continued) SPECIFICATION RATING/DESCRIPTION CONDITION OUTPUT CHARACTERISTICS (CONTINUED) Series Connection For slave unit, use analog programming Automatic or Master-Slave Operation, limited by the d-c only. isolation limit voltage Parallel Connection Automatic or Master-Slave Operation For slave unit, use analog programming only.
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FIGURE 1-2.
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FIGURE 1-2.
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FIGURE 1-3.
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1.4 FEATURES 1.4.1 LOCAL CONTROL Front panel keypad entries and an LCD type display are utilized for setting and/or adjusting output voltage and current under local control. The keypad's keys are organized to either directly execute commands, or to introduce a program that can either be run once or cycled. Calibration of the unit is facilitated by a password -protected, menu-driven procedure from the front panel. Refer to PAR. 3.2 for more information. 1.4.
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1.4.4 OVERVOLTAGE/OVERCURRENT PROTECTION Overvoltage and Overcurrent protection values can be individually programmed. The range for overvoltage and overcurrent values are 0 to 1.1 x EOmax, 0 to 1.1 x IOmax. If the output voltage/current is maintained at or above the overvoltage/overcurrent protection value for more than 9ms, the protection circuit cuts the pass element off, discharges the output capacitor, trips the POWER circuit breaker to OFF and sends a flag on a dedicated line (status port connector).
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ping the circuit breaker. A flag is sent to the host computer via a dedicated line of the Status and Remote On/Off port. b. Overvoltage/overcurrent at the output. See PAR. 1.4.4 c. Uneven voltage in the pass and sink elements. Voltage is monitored across different transistors of the pass and sink elements.
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TABLE 1-3. CONNECTOR A2J5 SIGNAL DESCRIPTIONS SIGNAL PIN. NO. VALUE Step Down Flag 2 < –11V for steady or step-up output > +11V for step-down output, or when protection circuit has functioned. Output of open loop Op Amp (A2U2C) through 1K resistance.* V-C Mode Flag 3 < –11V for CV (Constant Voltage) mode > +11V for CC (Constant Current) mode Output of open loop Op Amp (A2U2A) through 1K resistance.
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1.5 EQUIPMENT SUPPLIED Equipment supplied with the unit is listed in Table 1-4. TABLE 1-4. EQUIPMENT SUPPLIED ITEM 1.
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1.7 SAFETY There are no operator serviceable parts inside the case. Service must be referred to authorized personnel. Using the power supply in a manner not specified by Kepco. Inc. may impair the protection provided by the power supply. Observe all safety precautions noted throughout this manual. Table 1-6 lists symbols used on the power supply or in this manual where applicable. TABLE 1-6. SAFETY SYMBOLS SYMBOL MEANING CAUTION: RISK OF ELECTRIC SHOCK. ! 1-14 CAUTION: REFER TO REFERENCED PROCEDURE.
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SECTION 2 - INSTALLATION 2.1 UNPACKING AND INSPECTION This instrument has been thoroughly inspected and tested prior to packing and is ready for operation. After careful unpacking, inspect for shipping damage before attempting to operate. Perform the preliminary operational check as outlined in PAR 2.5. If any indication of damage is found, file an immediate claim with the responsible transport service. 2.2 TERMINATIONS AND CONTROLS a). Front Panel: Refer to Figure 2-1 and Table 2-1. b).
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TABLE 2-1. CONTROLS, INDICATORS, AND CONNECTORS CONTROL, INDICATOR, CONNECTOR FUNCTION FRONT PANEL (See Figure 2-1.) A-C line indicator Lights to indicate unit turned on and a-c power applied. LCD 2 x 16 character Liquid Display with LED backlight. Shows voltage, current mode, settings, menu, program, etc. Keypad 24 keys used for local operation of the power supply; Refer to Table 3-2 for details. POWER circuit breaker Output jack Circuit breaker used to turn unit on and off.
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FIGURE 2-2.
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TABLE 2-2.
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TABLE 2-4.
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TABLE 2-8. CURRENT PROGRAMMING TERMINAL STRIP A6TB3, TERMINAL ASSIGNMENTS TERMINAL 2.
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2.5 PRELIMINARY OPERATIONAL CHECK WARNING BEFORE APPLYING AC SOURCE POWER TO THE POWER SUPPLY, VERIFY THAT THE LINE VOLTAGE TO BE SUPPLIED MATCHES THE POSITION OF THE AC INPUT SELECTOR SWITCH AT THE REAR PANEL (FACTORY DEFAULT IS 115V). A simple operational check after unpacking and before equipment installation is advisable to ascertain whether the power supply has suffered damage resulting from shipping. Refer to Figures 2-1 and 2-2 for location of operating controls and electrical connections.
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NOTE: If tolerances specified in the following steps are exceeded, refer to Section 4 and recalibrate the unit. 6. Compare the programmed output voltage value with the voltage reading of the DVM; the difference between the two should not exceed 0.025% of the nominal voltage of the unit. 7. Compare the voltage reading of the LCD with that of the DVM; the difference between the two should not exceed 0.05% of the nominal voltage of the unit. 8.
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2.6.2 RACK MOUNTING Using a Kepco RA 24 Rack Adapter, two 1/2 rack BHK-MG 40W units can be mounted in a 19inch wide rack, after the bench-type feet are removed (see Figure 1-3). Optional slides for the rack adapter (see Table 1-5) can be used to improve access to the unit. 2.7 WIRING INSTRUCTIONS Interconnections between an a-c power source and the power supply, and between the power supply and its load are as critical as the interface between other types of electronic equipment.
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One of the most important considerations in establishing a successful grounding scheme is to avoid GROUND LOOPS. Ground loops are created when two or more points are grounded at different physical locations along the output circuit. Due to the interconnection impedance between the separated grounding points, a difference voltage and resultant current flow is superimposed on the load.
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characteristics, or c) where the dynamic output response of the power supply is critical to load performance. 2.7.4.1 CABLE RECOMMENDATIONS For power cables (positive and negative) No. 20 or 22 AWG stranded wire is recommended for each (these sizes fit the plugs supplied for the front panel output connections). The wire insulation must be rated for nominal voltage of the power supply (e.g., 500V for BHK 500-80MG).
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FIGURE 2-4. 2.7.5.1 LOCAL SENSING, SLOW MODE SELECTED, GROUNDING NETWORK CONNECTED, FLOATING OUTPUT (FACTORY DEFAULT CONFIGURATION) LOCAL SENSING/REMOTE SENSING SELECT Local sensing (factory default configuration) is established by connecting terminals TB1-6 (+S) to TB1-7 (+OUT) and TB1-2 (–OUT) to TB1-3 (–S) (see Figure 2-4). The power supply is shipped with these connections installed for local sensing. Remote sensing is established by removing the links between TB1-6, TB1-7 and TB1-2, TB1-3.
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between terminals TB1-5 (GND NET) and TB1-6 (+S). To disconnect the grounding network from the output, remove the connection across TB1-5 and TB1-6 (see Figure 2-4). 2.7.5.4 POSITIVE OUTPUT, NEGATIVE TERMINAL GROUNDED To configure the BHK-MG as a positive output power supply (referenced to ground), connect the negative output terminal to ground: connect TB1-4 (GND - CHASSIS) to TB1-3 (–S).
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TABLE 2-9. INTERNAL JUMPER CONFIGURATION LOCATION 2.9 DEFAULT STATUS JUMPER FUNCTION A1 J6 Not Installed For Service Personnel only. When installed (short circuit) a first time calibration will be initiated. Use this jumper only when necessary, then remove the jumper after calibration is initiated. A2 JP1 Installed Enables input circuit breaker to trip when arcing at the output is detected.
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SECTION 3 - OPERATION 3.1 GENERAL This section explains how to operate the BHK-MG 40W Power Supply. The power supply can be operated either in Local mode using the front panel keypad and LCD (PAR. 3.2), or in Remote mode using SCPI commands via either the GPIB bus (PARs. 3.3, 3.7) or RS 232 bus (PAR. 3.5) or using analog programming via the rear panel terminals (PAR 3.8).
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TABLE 3-1. LCD MESSAGES Bottom left: LOCATION MESSAGE Top left Loc/Rem Top middle SINK top right OFF/CV/CC in command entry n.nV In data entry (parameter) DESCRIPTION Digital control status: either Remote or Local Shows that the unit is in sink mode and is absorbing energy either from the load or the internal output capacitor. The sink current is model-dependent and appears on the second line of the display preceded by a minus (–) sign.
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TABLE 3-2. KEY FUNCTIONS (CONTINUED) KEY MENU OV SET 7 OC SET 8 CALIB 9 POWER SUPPLY STATUS ACTIVE Command Entry Command Entry Data Entry Command Entry Data Entry Command Entry Data Entry DESCRIPTION REFERENCE PARAGRAPH Press to enter Menu commands: press repeatedly to scroll through Menu functions: (1) set LCD contrast, (2) GPIB address, (3) Baud Rate.
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TABLE 3-2. KEY FUNCTIONS (CONTINUED) REFERENCE PARAGRAPH POWER SUPPLY STATUS ACTIVE DESCRIPTION 3.2.9, 3.2.15.1 Command Entry — In CV (constant voltage), press to decrease output voltage by increment equal to voltage resolution (0.025% of EOmax). — In CC (constant current), press to decrease output current by increment equal to current resolution (0.025% of IOmax).
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Loc 0.000V (:_:_:) OFF 0.000A (a) Default Display State for OUT OFF @ Pwr-Up Selection (PAR. 3.2.7.4) NOTE: (:_:_:) CV 0.000A (b) Default Display State for OUT ON at Pwr-Up Selection (PAR. 3.2.7.4) (:_:_:) indicates blinking colon (:), Command Entry status (=_=_=) indicates blinking equal sign (=), Data Entry status FIGURE 3-1. 3.2.3 Loc 0.
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The BHK-MG incorporates a “keypad lockout” command which allows the LOCAL key to be disabled during remote operation, preventing inadvertent setting of the power supply to Local mode. When the keypad is locked, the LCD displays RwL in place of LOC. If the keypad is locked, it must be unlocked either by a remote command (see Appendix B, PAR. B.82), or cycling the power supply off then on. 3.2.
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3.2.7.3 REMOTE SHUTDOWN USING EXTERNAL TRIGGER PORT A temporary short between pin 2 and pin 1 of the External Trigger port (or if pin 2 is at TTL logic 1, applying a temporary logic 0 to pin 2 referenced to pin 1) produces a shutdown signal which immediately shuts down the power supply output: output is disabled and voltage and current are set to zero (1 LSB maximum for voltage, 20 LSBs maximum for current). The DCL Control setting (see PAR. 3.3.
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3.2.9 SETTING OUTPUT VOLTAGE OR CURRENT V SET and I SET set output voltage and current limit, respectively, when the unit is in constant voltage (CV) mode and set voltage limit and output current, respectively, when the unit is in constant current (CC) mode. The mode (CV or CC) is determined by the load together with the programmed settings.
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3.2.11 CHANGING MAXIMUM VOLTAGE OR CURRENT VALUE The default maximum values of voltage and current are determined by the model, e.g., 500V and 80mA for the BHK 500-80MG. These values can be lowered by the user to prevent inadvertent damage to a specific circuit under test by establishing software limits through the use of the MENU key. Lowering the maximum values of the BHK 500-80MG to 100V and 40mA, effectively makes the unit a 100V/40mA power supply.
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3.2.13 RECALLING STORED OUTPUT SETTINGS With the power supply in command entry status (:_:_:), press RECALL. The LCD reads RECALL mem (=_=_=) nn where nn is the memory location holding the settings to be retrieved. Press CLEAR to exit without changing setting. Press ENTER to validate existing location, or enter memory location (from 1 to 40) and press ENTER.
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TABLE 3-4. MEMORY LOCATION WORKSHEET MEMORY LOCATION I SET (Current) (mA) V SET (Voltage) (V) OCset (Overcurrent Protection) (mA) OV set (Overvoltage Protection) (V) TIMEval (0. to 655.
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3.2.15.1.1 MODIFYING PROGRAMMED TIME INTERVAL The TIME key offers a quick and easy way to change the time for any memory location. With the power supply in command entry status (:_:_:), press TIME key. The LCD displays TIME@nn (=_=_=) where nn is the current memory location of the TIME function. Press CLEAR to exit without changing setting. Press ENTER to validate existing location or enter the new location and then press ENTER. The display now shows TIMEval = n.n s where n.
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3.2.15.4 CYCLING A PROGRAM To cycle a program, modify the program (see PAR. 3.2.15.1) and go to the last memory location to be executed and set the NEXT STEP address to the Starting address, causing the program to loop and repeat indefinitely. For example, if the last location is 14, and the starting location is 05, press EDIT PROG, enter 14, then press ENTER. Press until LCD reads ViewVAL Mem14 NEXT STEP (=_=_=). Enter 5 and press ENTER.
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3.3 REMOTE MODE PROGRAMMING USING SCPI COMMANDS VIA IEEE 488 (GPIB). BUS BHK-MG Power Supplies may be programmed over a control bus using SCPI (Standard Commands for Programmable Instruments). SCPI provides a common language conforming to IEEE 488.2 for instruments used in an automatic test system. The control bus used must be either the IEEE 488 standard communication bus (General Purpose Interface Bus, GPIB). or the RS 232 Serial Bus described in PAR. 3.5.
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TABLE 3-7.
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To change the DCL mode the unit must be in command entry mode (:_:_:), then depress the MENU key until the top line of the display shows the current setting: either DCL OUTP = 0 or DCL = OUTP UNCHNG. Depress 1 for “output unchanged” mode where the output is unaffected by DCL; depress 1 again for “output = 0” mode where DCL sets the output to 0 volts and current is set to the power-up and reset current value (see PAR. 3.2.8.1). 3.3.
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1. Minimize programmed mode (voltage or current) changes. Unless absolutely required by the test parameters, allow the power supply to automatically switch modes as determined by the load. This will improve response time and reduce undesirable transients. 2. For MAT/MBT units only, once the mode (voltage or current) is chosen and programmed, program the active parameter to zero and the complementary limit parameter to the maximum anticipated for the application. Then program only the active parameter.
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Failure to provide an adequate delay can result in: • Commands that are not processed, • The following command may be received in error, causing an error in the transmission, • Unit lock-up requiring power cycling of the unit. If working via the GPIB bus, sending Interface Clear and Device Clear followed by *RST will unlock the unit. #include #include #include #include
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manual which can be used to program one or more BHK-MG power supplies using a virtual front panel observed on a computer monitor. Download the latest VISA driver from the Kepco website at http://www.kepcopower.com/drivers.htm Although the software drivers supplied by Kepco are VISA compliant, they also require the installation of the proper 16-bit VISA driver from your GPIB card supplier. Many vendors supply this software with the hardware; National Instruments (http://www.natinst.
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originator (computer) and the BHK-MG 40W Power Supply, thus avoiding a more complex “handshake” protocol. When the BHK-MG is in the RS 232 echo mode it returns all data sent to the host controller. The BHK-MG provides two additional options that allow handshake communication: the Prompt method and the XON XOFF method. In standard echo mode the controller must verify that each character is echoed back by the BHK-MG.
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3.5.3.2 PROMPT METHOD The command originator sends a message line (command) to the BHK-MG and waits until the prompt sequence CR LF > (3EH, 6210) is received. The BHK-MG sends the prompt sequence CR LF > to the command originator indicating the power supply is ready to receive the next command and data will not be lost.
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3.6 PROGRAMMING TECHNIQUES TO OPTIMIZE PERFORMANCE Proper programming techniques can offer significant response time improvement and reduce undesirable transients at the output. The key to performance optimization is to minimize mode changes (voltage mode/current limit to current mode/voltage limit or vice versa). Mode changes should be limited to changes in load conditions (to which the power supply will respond automatically), or by programming the limit parameter when required by the user application.
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3.7.1 SCPI MESSAGES There are two kinds of SCPI messages: program messages from controller to power supply, and response messages from the power supply to the controller. Program messages consist of one or more properly formatted commands/queries and instruct the power supply to perform an action; the controller may send a program message at any time.
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3.7.3.6 INSTRUMENT SUBSYSTEM This subsystem controls the power supply's voltage and current outputs and allows compatibility with other vendor’s products 3.7.3.7 STATUS SUBSYSTEM This subsystem programs the power supply status register. The power supply has two groups of status registers: Operation and Questionable. Each group consists of three registers: Condition, Enable, and Event. 3.7.3.
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ROOT : (colon) ABORt subsystem ABORt [SOURce:] subsystem MEASure [:SCALar]:CURRent[:DC]? [:SCALar]:[VOLTage][:DC]? [SOURce:] CURRent [:LEVel] [:IMMediate] [:AMPLitude] val [:AMPLitude]? MIN, MAX :TRIGgered [:AMPLitude] val [:AMPLitude]? MIN, MAX :LIMit ! [:HIGH] val [:HIGH]? MIN, MAX :MODE LIST, FIX :PROTection val VOLTage [:LEVel] [:IMMediate] [:AMPLitude] val [:AMPLitude]? MIN, MAX :TRIGgered [:AMPLitude] val [:AMPLitude]? MIN, MAX :LIMit ! [:HIGH] val [:HIGH]? MIN, MAX :MODE LIST, FIX :PROTection val
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KEYWORD DATA SEPARATOR ROOT SPECIFIER DATA MESSAGE UNIT SEPARATOR MESSAGE UNIT SEPARATOR DATA DATA SEPARATOR ROOT SPECIFIER KEYWORD KEYWORD KEYWORD SEPARATOR QUERY INDICATOR MESSAGE TERMINATOR KEYWORD CURR:LEV 3.5;:OUTP ON;:CURR? MESSAGE UNIT FIGURE 3-5. 3.7.4 MESSAGE STRUCTURE PROGRAM MESSAGE STRUCTURE SCPI program messages (commands from controller to power supply) consist of one or more message units ending in a message terminator (required by Kepco power modules).
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short form only the first three or four letters of the long form are used (e.g., STAT, VOLT, OUTP, and TRIG). The rules governing short form keywords are presented in Table 3-9. TABLE 3-9.
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VOLT:LEV:IMM 16 Both colons are keyword separators. :CURR:LEV:IMM 4 The first colon is the root specifier, the other two are keyword separators. VOLT:LEV 6;:CURR:LEV 15 The second colon is the root specifier, the first and third are keyword separators :INIT ON;:TRIG;:MEAS:CURR?;VOLT? The first three colons are root specifiers. 3.7.4.8 MESSAGE TERMINATOR The message terminator defines the end of a message.
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3.7.6 PROGRAM MESSAGE SYNTAX SUMMARY • Common commands begin with an asterisk (*). • Queries end with a question mark (?). • Program messages consist of a root keyword and, in some cases, one or more message units separated by a colon (:) followed by a message terminator. Several message units of a program message may be separated by a semicolon (;) without repeating the root keyword.
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/**************************************************************************/ /* Sample Program For KEPCO power supply, using National Instruments */ /* GPIB interface card and IBM PC or compatible computer */ /**************************************************************************/ #include #include "decl.
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BHK-1/2-MG 121313 FIGURE 3-7. ANALOG VOLTAGE PROGRAMMING, SIMPLIFIED DIAGRAM FIGURE 3-8.
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For each circuit, the digital programming section provides a voltage (DP (V) for voltage, DP (C) for current), between zero and -10V d-c, applied to the input of a summing amplifier. This amplifier drives, in turn, the voltage error amplifier and the pass element to produce the output. Each circuit also includes an uncommitted amplifier which can be configured to be summed with the output of the digital programming section at the input of the summing amplifier.
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3.8.1 ANALOG PROGRAMMING WARNINGS AND CAUTIONS WARNING THE POWER SUPPLY PRODUCES DANGEROUS VOLTAGES WHICH CAN BE LETHAL. ALWAYS OBSERVE THE FOLLOWING PRECAUTIONS. a. Always connect the chassis of the power supply to a good AC ground (earth) connected to OUTPUT TERMINALS terminal strip TB1, terminal 4. NOTE: All connections must be tight, whether at the terminal strips of the power supply or at external equipment. b.
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WARNING The following warnings and cautions apply to the analog programming terminals because the analog control circuitry operates at the +OUTPUT potential and the common of the analog control circuitry is connected to the +OUT terminal (TB1) through the sensing resistor (Rs) of the power supply. • If the power supply is operating with +OUT terminal connected to ground, do not connect grounded inputs or outputs of any external equipment to power supply analog programming terminals.
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FIGURE 3-9. ANALOG PROGRAMMING OF OUTPUT VOLTAGE (VOLTAGE MODE) OR VOLTAGE LIMIT (CURRENT MODE) USING RESISTANCE For either voltage programming or current programming, the external resistor REXT connected across terminals 6 and 8 of VOLTAGE PROG terminal strip TB2 or CURRENT PROG. terminal strip TB3 functions as a feedback resistor for the internal uncommitted amplifier dedicated to voltage or current programming.
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FIGURE 3-10. ANALOG PROGRAMMING OF OUTPUT CURRENT (CURRENT MODE) OR CURRENT LIMIT (VOLTAGE MODE) USING RESISTANCE 3.8.2.1 VOLTAGE MODE With the power supply in voltage mode (see Figure 3-9) and the digitally programmed output voltage at zero, varying the external resistor from 0 to 10K causes the output voltage of the power supply to vary linearly from 0 to EOmax with a slope of (0.0001 x EOmax) volts per ohm. The following equation gives the output voltage as determined by external resistance REXT.
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NOTE: Output voltage is referenced to +OUT and output current is negative leaving +OUT terminal. This convention applies to voltage and current programming calculations of PAR. 3.8 3.8.2.2 CURRENT MODE With the power supply in current mode (see Figure 3-10) and the digitally programmed output voltage at zero, varying the external resistor from 0 to 10K causes the output current of the power supply to vary linearly from 0 to IOmax with a slope of (0.0001 x IOmax) mA per ohm.
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FIGURE 3-11.
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FIGURE 3-12.
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FIGURE 3-13.
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FIGURE 3-14. ANALOG PROGRAMMING OF OUTPUT CURRENT (CURRENT MODE) OR CURRENT LIMIT (VOLTAGE MODE) USING GROUNDED LOW IMPEDANCE VOLTAGE SOURCE (VS) 3.8.3.1 VOLTAGE MODE With the power supply in voltage mode (see Figure 3-11 or 3-12) and the digitally programmed output voltage at zero, varying the low impedance voltage source from 0 to +10V causes the output voltage of the power supply to vary linearly from 0 to EOmax with a slope of (0.1 x EOmax) volts per volt.
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ANALOG PROGRAMMING, DIGITAL PROGRAMMING = 0: Eo = (–1) (VEXT) x (10K/10K) x (–1) (10K/10K) x (–1) (R/10K) = (–1) (0.1 x R) x VEXT = –0.1R x VEXT (V d-c) where R= Internal feedback resistance (K-ohms), determined by Model (see Table 3-10). VEXT = External low impedance voltage source. This source can be either a d-c source delivering a positive output voltage, or a function generator with an internal positive bias.
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age when the unit is in voltage mode, or voltage limit when the unit is in current mode. Figure 316 is a similar diagrams for programming either output current when the unit is in current mode, or current limit when the unit is in voltage mode CAUTION Observe the following to avoid damage to the power supply.
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FIGURE 3-16.
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3.8.4.1 VOLTAGE MODE With the power supply in voltage mode (see Figure 3-15) and the digitally programmed output voltage at zero, varying the high impedance voltage source from 0 to –1V causes the output voltage of the power supply to vary linearly from 0 to EOmax with a slope of (EOmax) volts per volt. The following equations give the output voltage as determined by a high impedance voltage source VEXT. ANALOG PROGRAMMING, DIGITAL PROGRAMMING = 0: Eo = (VEXT) x (11.1K/1.
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3.8.5 PROGRAMMING WITH EXTERNAL CURRENT SOURCE (1 mA) Figures 3-17 and 3-18 are simplified diagrams of the BHK-MG showing the jumper configuration and external connections required for analog programming using a current source (1mA). Figure 3-17 shows the configuration for programming of either output voltage when the unit is in voltage mode, or voltage limit when the unit is in current mode.
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FIGURE 3-18. ANALOG PROGRAMMING OF OUTPUT CURRENT (CURRENT MODE) OR CURRENT LIMIT (VOLTAGE MODE) USING CURRENT SOURCE (1mA) (CS) The external current source is applied to the inverting input of the uncommitted amplifier which is configured as a current-voltage converter. CAUTION Observe the following to avoid damage to the power supply.
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3.8.5.1 VOLTAGE MODE With the power supply in voltage mode (see Figure 3-17) and the digitally programmed output voltage at zero, varying the external current source from 0 to 1mA causes the output voltage of the power supply to vary linearly from 0 to EOmax with a slope of (EOmax) volts per mA. The following equations give the output voltage as determined by the external current source IEXT.
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3.9 OPERATING MODES This section describes the following operating modes for the BHK-MG 40W Power Supply 3.9.1 • Slow/Fast Mode • Series Operation • Automatic Series Operation • Master-Slave Series Operation • Parallel Operation • Automatic Parallel Operation • Master-Slave Parallel Operation SLOW/FAST MODE OF OPERATION In slow mode of operation the internal output capacitor COUT is connected across the sensing terminals via TB1, terminal 1 (-OUT.C) and terminal 2 (-OUT).
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FIGURE 3-19. SLOW MODE/FAST MODE OPERATION b. If precise control of the voltage across the external capacitor is desired, use remote sensing: connect the sensing leads and power leads across the external output capacitor and connect the load to the external capacitor. c. If the external capacitor has a value much smaller than internal output capacitor COUT (see Table 1-2), then it is not necessary to connect the internal capacitor at the output using the link between terminals TB1-1 and TB1-2.
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3.9.2 SERIES OPERATION Kepco BHK-MG power supplies can be series-connected to increase output voltage if the precautions outlined below are followed. Two basic series-connection methods are generally used: automatic (PAR. 3.9.2.1) and master-slave (PAR. 3.9.2.2). WARNING HANDLING HIGH VOLTAGE, LOW IMPEDANCE EQUIPMENT IS DANGEROUS, AND POTENTIALLY LETHAL. OBSERVE ALL PRECAUTIONS LISTED IN PAR. 3.8.1., AS WELL AS THE PRECAUTIONS LISTED BELOW. a.
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3.9.2.1 AUTOMATIC SERIES OPERATION This operating configuration (see Figure 3-20) is characterized by the fact that each power supply is independent and must be controlled (programmed) individually, either remotely—via either the GPIB bus or by analog means—or locally via the keypad. Practical considerations suggest that the units operate in voltage mode - current limit, controlled from the local keypad.
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c. Program overcurrent value of unit A (IocsetA) to 1.1 x current limit for power assembly (step 3a). d. Program overvoltage value of unit A (VovsetA) to 1.1 x VsetA (step 3b). 4. Program unit B as follows:. a. Program IsetB to approximately 1.01 to 1.02 x IsetA (step 3a). This maximum current limit is never used except in the unlikely event that the current limit of Unit A is not working. b. Program VsetB to (Eo – VsetA) (VsetA is set in step 3b). c. Program overcurrent value of unit B (IocsetB) to 1.
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FIGURE 3-20.
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3.9.2.2 MASTER-SLAVE SERIES OPERATION (AUTOMATIC TRACKING) This configuration is characterized by the fact that only the master power supply is programmed (controlled), while the slave power supply follows the command of the master in a ratio which may be predetermined by the user. This method is, therefore, often termed automatic tracking. A master-slave series combination with a single slave is shown in Figure 3-21 configured to operate in voltage mode, and in Figure 3-22 to operate in current mode.
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The load current is given by the equation, Io = Eo/RLOAD RECOMMENDED PROCEDURE. The following steps are recommended to ensure the combination of power supplies (power assembly) configured for master-slave series (automatic tracking) operation is connected and set up properly for voltage mode operation. 1. With the units turned off, perform all external wiring (see Figure 3-21). If possible, use a properly rated switch between the power supply and the load. Use REXT = EOmaxM (see PAR. 3.9.2.2.1). 2.
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6. To disable power to the load: a. If load switch used, open the switch. b. If load switch not used, press POWER ON/OFF key: once on the master unit, then once on the slave unit. c. Alternative: Turn both units off by setting POWER switch to off (down) position, first on master unit, then on slave unit. FIGURE 3-21.
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3.9.2.2.2 CURRENT MODE OPERATION When the series combination is operating in current mode (see Figure 3-22), the master is in current mode and receives current programming commands while output voltage is determined by the current through the load; the slave is in voltage mode and tracks the master output voltage. FIGURE 3-22.
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The output current of the series combination operating in current mode is determined by the output current of the master: Io = IoM, where IoM is the output current of the master, in mA. The load voltage is Eo = IoM x RLOAD where Eo is the output voltage of the series combination. The split of voltage between the master and slave is the same as for voltage mode (see eq1 above); when REXT (in K-ohms) = EOmaxS (in Volts), the slave and master output voltage are the same: EoS = EoM = Eo / 2.
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d. Program overvoltage value of master unit (VovsetM) to 1.1 x VsetM (step 4b). 5. To apply power to the load: a. If load switch used, open the switch. b. If load switch not used, press POWER ON/OFF key once on slave unit, then once on master unit. 6. To disable power to the load: a. If load switch used, close the switch. b. If load switch not used, press POWER ON/OFF key once on master unit, then once on slave unit. c.
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are shown using local sensing since the drop across the power leads is usually negligible compared to the output voltage. However, when very precise control of output voltage applied to the load is desired, remote sensing should be used. Contact Kepco Applications Engineering when special configurations are indicated. 3.9.3.
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FIGURE 3-23. PARALLEL AUTOMATIC CONFIGURATION • Eo is the output voltage of the power assembly.
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• EOmaxA is the rated maximum output voltage for unit A (e.g. 500 for the BHK 50080MG). c. Program overcurrent value of unit A (IocsetA) to 1.1 x IsetA (see step 3a). d. Program overvoltage value of unit A (VovsetA) to 1.1 x Eo. 4. Program unit B as follows: a. Program IsetB to the rated maximum current of unit B (IOmaxB), e.g., 80 (mA) for BHK 500-80MG. b. Program VsetB to Eo. c. Program overcurrent value of unit B (IocsetB) to 1.1 x the rated maximum current for unit B (IOmaxB), e.g., 1.
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3.9.3.2.1 VOLTAGE MODE OPERATION When the parallel combination is configured to operate in voltage mode (see Figure 3-24), the master operates in voltage mode, receiving voltage programming commands, and the slave tracks the output current of the master. FIGURE 3-24.
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The output voltage of the parallel combination in voltage mode is given by the equation, Eo = EoM where EoM is the output voltage of the master unit, in Volts. The load current is given by the equation, Io = Eo / RLOAD. The individual currents of the master and slave supplies are, IoM = IoS = Io / 2. RECOMMENDED PROCEDURE.
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b. If load switch not used, press POWER ON/OFF key once on slave unit, then once on master unit. 6. To disable power to the load: a. If load switch used, open the switch. b. If load switch not used, press POWER ON/OFF key once on master unit, then once on slave unit. c. Alternative: Turn both units off by setting POWER switch to off (down) position, first on master unit, then on slave unit. 3.9.3.2.
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FIGURE 3-25.
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3. Program slave unit as follows: a. Program output current of slave unit (IsetS) to 0. b. Program VsetS to the rated maximum voltage of the slave unit, EOmaxS (e.g., for BHK1000-40MG set VsetS = 1000). c. Program overcurrent value of slave unit (IocsetS) to 1.1 x rated maximum current of slave unit, IOmaxS (e.g., for BHK 1000-40MG, program IocsetS = 44 (mA)). d. Program overvoltage value of slave unit (VovsetS) to 1.1 x voltage limit ELIM desired for power assembly. 4. Program master unit as follows: a.
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SECTION 4 - CALIBRATION 4.1 GENERAL This section contains the calibration instructions for the Power Supply. It is recommended that the user be familiar with Local Mode operation (PAR.3.2) before calibrating the unit. A full calibration consists of a voltage calibration and a current calibration. Voltage calibration consists of a zero and a full scale calibration, current calibration consists of a zero, full scale and 10% of full scale calibration. (Refer to PAR. 4.3 for more information.
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then proceed to saving the calibration results. For either voltage or current calibration, BOTH zero AND full scale calibrations must be performed. For both current and voltage calibration all loads must be disconnected from the power supply output; the sense terminals must be connected to the corresponding output terminals. For voltage calibration the digital voltmeter will be connected to the output of the power supply.
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NOTE: The message Can’t Adj. Full Scale is displayed if either a load less than nominal or a shunt resistor is connected to the output terminals during voltage calibration. If this occurs, it is necessary to press ENTER followed by RESET to restore proper operation. Disconnect load or shunt and refer to PAR. 4.4, step 1 to restart calibration. 4.4.2 CURRENT CALIBRATION 1. LCD reads CONNECT SHUNT zz A (nn and zz values are determined by BHKMG model being calibrated.; e.g.
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4.5 CALIBRATION USING VISA DRIVER NOTE: The left and right single arrow buttons on the VISA panel are equivalent to the front panel left and right arrow keys. The left double arrow button on the VISA panel is equivalent to the 1 key on the front panel keypad; the right double arrow button is equivalent to the 3 key. Calibration of the BHK-MG 40W Power Supply is performed using SCPI commands implemented through the Instrument driver.
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FIGURE 4-2. MAIN PANEL (BHK 1000-40MG, TYPICAL) BEFORE PASSWORD ACCEPTED AFTER PASSWORD ACCEPTED FIGURE 4-3.
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TABLE 4-1. CALIBRATION PANEL FUNCTIONS BUTTON OR WINDOW Text box (at top) Function Used to enter unit password. Press ENTER on computer keyboard to validate password. VOLTAGE button Initiates Voltage calibration VOLTAGE Indicator below VOLTAGE button Lights green when VOLTAGE calibration is acceptable. Lights red if VOLTAGE calibration needs to be done. CURRENT button Initiates Current calibration CURRENT Indicator below CURRENT button Lights green when CURRENT calibration is acceptable.
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tons (see PAR. 4.5.2), adjust the output until the DVM is a close as possible, but above, the rated nominal voltage, e.g., 1000.00V for the BHK 1000-40MG, then click OK button. 7. Voltage calibration is complete and the indicator below the VOLTAGE button on the calibration panel (Figure 4-3) lights green. If desired, the voltage calibration can be repeated by clicking VOLTAGE button at the calibration panel. If current calibration is not necessary, proceed to step 14. 8.
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4.6 CHANGING THE CALIBRATION PASSWORD The 4-digit password is required to enter calibration mode. The factory default passwords are listed in Table 4-2. TABLE 4-2. FACTORY DEFAULT CALIBRATION PASSWORDS MODEL PASSWORD BHK 300-130MG 0300 BHK 500-80MG 0500 BHK 1000-40MG 1000 BHK 2000-20MG 2000 1. With the power supply in command entry status (:_:_:), press MENU key until LCD reads Change Passw. OldPass(=_=_=). 2. Enter the old password and press ENTER.
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4. Enter 4-digit password and press ENTER. Factory calibration values are restored. 4.9 CALIBRATION STORAGE The BHK-MG 40W Power Supply. maintains the calibration tables in Flash Memory until a PACK is executed. There are six calibration areas maintained in Flash Memory: Working, Prior, Oldest, Factory, Master, and First. The calibration password is required In order to store the calibration. The calibration can be copied to another area using the CAL:DUMP? and CAL:COPY command.
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APPENDIX A - IEEE 488.2 COMMAND/QUERY DEFINITIONS A.1 INTRODUCTION This appendix defines the IEEE 488.2 commands and queries used with the BHK-MG 40W Power Supply These commands and queries are preceded by an asterisk (*) and are defined and explained in Figures A-1 through A-14, arranged in alphabetical order. Table A-1 provides a quick reference of all IEEE 488.2 commands and queries supported in the BHK-MG 40W Power Supply. TABLE A-1. IEEE 488.2 COMMAND/QUERY INDEX A.2 COMMAND PAR. COMMAND PAR.
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events of the Standard Event Status Enable Register are logically ORed to cause ESB (bit 5) of the Status Byte Register to be set (1 = set = enable function, 0 = reset = disable function). (See example, Figure A-1.) A.5 *ESR? — EVENT STATUS REGISTER QUERY Syntax: *ESR? *ESR? Return value: (Value = contents of Event Status register as defined in Table A-2.) Description: Reads the Standard Event Status register, clearing the register at the same time.
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*CLS *ESE 60 *ESE? *ES *ESR? *IDN? *OPC VOLT 250;CURR 3E-2 *SAV 33 *ESR? VOLT 215;CURR 15E-3 OUTP ON *OPC? *RCL 33 *RST *SRE 40 *SRE? *STB? Power supply clears status data. Power supply enables bits 5, 4, 3 and 2, allowing command error, execution error, device dependent error and query error to set the Event Status Summary bit when an STB? query is executed. Returns 60, (value of the mask) verifying that bits 5, 4, 3 and 2 are enabled. Unknown command will set command error (Bit 5).
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*SRE A.12 *SRE — SERVICE REQUEST ENABLE COMMAND Syntax: *SRE grammed. where = value from 0 - 255 per Table A-3, except bit 6 cannot be pro- Description: Sets the condition of the Service Request Enable register. The Service Request Enable regis- ter determines which events of the Status Byte Register are summed into the MSS (Master Status Summary) and RQS (Request for Service) bits. RQS is the service request bit that is cleared by a serial poll, while MSS is not cleared when read.
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APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS B.1 INTRODUCTION This appendix defines the SCPI subsystem commands and queries used with the BHK-MG 40W Power Supply. Subsystem commands are defined in PAR. B.3 through B.90, arranged Alphabetically in groups as they appear in the tree diagram, Figure 3-4. Table B-1 provides a quick reference of all SCPI subsystem commands and queries used in the power supply. TABLE B-1. SCPI SUBSYSTEM COMMAND/QUERY INDEX COMMAND PAR. COMMAND PAR. ABORt B.
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B.2 NUMERICAL VALUES The SCPI data parser of the BHK supports a maximum of 8 digits after the decimal point and a maximum integer of 4 x 108. Any values greater than these are not processed by the device and no error is generated. The largest string that can be received or transmitted by the BHK is 253 characters. All numerical data is returned in scientific notation, digits with decimal point and Exponent, e.g., 2.71E1 for 27.1 after calibration constants have been applied. Thus.
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NOTES: 1. Power supply assumed to be operating in constant voltage mode. 2. Examples below are intended only to illustrate command functions. Refer to PAR. 3.6 for programming techniques to optimize performance. OUTP ON OUTP? VOLT 221;CURR 1.5E-2 INIT:CONT ON INIT:CONT? VOLT:TRIG 215;CURR:TRIG 3E-2 *TRG VOLT 221;CURR 4E-2 MEAS:VOLT? MEAS:CURR? FUNC:MODE? CURR:TRIG? VOLT:TRIG? ABOR VOLT 277;CURR 2.5E-2 *TRG INIT:CONT 0 INIT:CONT? OUTP OFF OUTP? MEAS:VOLT? VOLT? CURR? CURR? MAX CURR? MIN CURR:PROT 3.
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B.7 DISP:MODE DISPlay:MODE COMMAND Syntax: Short Form: DISP:MODE NORM or DISP:MODE TEXT Long Form: DISPlay:MODE NORMal or DISPlay:MODE TEXT Description: Switches the LCD display between Normal and Text mode. Switches the display between its normal metering mode and a mode in which it displays text sent by the user on the second line. The default status at power up or after *RST is NORMal. In order to display text on the second line the display mode has to be changed to TEXT.
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INIT:CONT? B.13 INITiate:CONTinuous? QUERY Syntax: Short Form: INIT:CONT? Return Value: 1 or 0 Long Form: INITiate:CONTinuous? Description: Determines whether continuous triggers are enabled or disabled. Power supply returns value of INIT:CONT flag: “1” = continuous triggers are enabled (INIT:CONT ON); “0” = continuous triggers disabled (INIT:CONT OFF). (See example, Figure B-1.) INST:STAT B.
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LIST:COUN:SKIP? B.20 [SOURce:]LIST:COUNt:SKIP? QUERY Syntax: Short Form: LIST:COUN:SKIP? Return Value: Long Form: LIST:COUNt:SKIP? Description: Identifies how many steps will skipped the first time the list is executed. Returns value set by LIST:COUN:SKIP command. (See example, Figure B-3.) LIST:CURR B.21 [SOURce:]LIST:CURRent COMMAND Syntax: Short Form: LIST:CURR , , . . . (to max of 250 data points) Long Form: LIST:CURRent , , . . .
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LIST:DWEL? B.27 [SOURce:]LIST:DWELl? QUERY Syntax: Short Form: LIST:DWEL? Long Form: LIST:DWELl? Return Value: ,. . . Description: Identifies the dwell times entered for the list. Starting at location established by LIST:QUERy, returns comma-separated list of up to 16 values indicating the dwell time parameters entered. i.e., the contents of LIST:DWEL locations of the List Data Table. Related Commands: LIST: DWEL, LIST:QUERy. (See example, Figure B-3.) LIST:DWEL:POIN? B.
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NOTE: Examples below are intended only to illustrate command functions. Refer to PAR. 3.6 for programming techniques to optimize performance. LIST:CLEAR Initializes the list processor to add entries, clears main channel (LIST:CURR or LIST:VOLT) and LIST:DWEL data tables. LIST:DWELL .010 Sets the time duration for location 0 to be 0.010 second (Since dwell times for the rest of the locations in the list are not entered before running the list, the dwell time will be 0.010 second for all locations.
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LIST:QUERY 0 Sets query pointer to zero. LIST:DWEL:POIN? Returns 1 indicating the next dwell time will be entered in location 1. LIST:DWELL .01,.01,.01,.01,.01,.01,.01,.01,.01 Enters dwell time of 0.01 seconds in locations 1 through 9. LIST:DWELL 1 Enters dwell time of 1 second in location 10. VOLT:MODE LIST the list is not executed, the unit returns error -226,Settings Error indicating the lists are not balanced.
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OUTP? B.37 OUTPut[:STATe]? QUERY Syntax: Short Form: OUTP[:STAT]? Return Value: (0 or 1) Long Form: OUTPut[:STATe]? Description: Indicates whether power supply output is enabled or disabled. Returns 0 if output disabled, returns 1 if output enabled. Related Commands: OUTP. (See example, Figure B-1.) B.
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B.42 [SOURce:]CURRent:MODE COMMAND CURR:MODE Syntax: Short Form: [SOUR:]CURR:MODE (FIX | LIST) Long Form: [SOURce:]CURRent:MODE (FIXed | LIST) Description: Allows the user to execute or stop a list. The default mode is FIX: the power supply executes commands normally, and LIST commands can be issued to establish the parameters and sequence of a list. When CURR:MODE LIST is issued, a list is executed (See LIST commands and Figure B-3).
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NOTES: 1. The power supply is assumed to be operating in constant voltage (CV) mode. 2 Examples below are intended only to illustrate command functions. Refer to PAR. 3.6 for programming techniques to optimize performance. OUTP ON VOLT 421;CURR 1.1E-2 CURR? CURR:LIM:HIGH 3.3E-2 CURR:LIM:HIGH? CURR 4.2E-1 CURR? CURR 1.0E-2 CURR? CURR:PROT 2.5E-2 Output Enabled Power supply programmed to voltage limit 421V, 0.011A. Returns 1.1E-2. Current limit set to 0.033A. Returns 3.
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VOLT:MODE B.52 [SOURce:]VOLTage:MODE COMMAND Syntax: Short Form: [SOUR:]VOLT:MODE (FIX | LIST) Long Form: [SOURce:]VOLTage:MODE (FIXed | LIST) Description: Allows the user to execute or stop a list. The default mode is FIX: the power supply executes commands normally, and LIST commands can be issued to establish the parameters and sequence of a list. When VOLT:MODE LIST is issued, a list is executed (See LIST commands and Figure B-3).
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FUNC:MODE? B.58 [SOURce:]FUNCtion:MODE? QUERY Syntax: Short Form: FUNC:MODE? Return Value: VOLT or CURR Long Form: [SOURce:]FUNCtion:MODE? Description: Identifies the operating mode of the power supply. VOLT = Constant Voltage mode (CV). CURR = Constant Current mode (CC). (See example, Figure B-1.) NOTES: 1. The power supply is assumed to be operating in constant voltage (CV) mode. 2 Examples below are typical (using BHK 1000-40MG), intended only to illustrate command functions. Refer to PAR. 3.
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NOTE:The power supply is assumed to be operating in CV (constant voltage) mode. OUTP ON VOLT 3;CURR 1E-2 STAT:OPER:ENAB 1056 STAT:OPER:ENAB? STAT:QUES:ENAB 3 STAT:QUES:ENAB? STAT:PRES Output Enabled. Program output to 3V, 0.01A Mask enabled for CC, WTG and bits. Returns 1056 (32 + 1024) (CC, WTG bits set). Mask enabled for OV and OC bits (1 + 2). Returns 3 (1 + 2) indicating OV and OC bits are enabled. Operation Condition Enable and Questionable Condition Enable registers are preset.
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STAT:QUES? B.64 STATus:QUEStionable[:EVENt]? QUERY Syntax: Short Form: STAT:QUES[:EVEN]? Long Form: STATus:QUEStionable[:EVENT]? Return Value: actual register value Description: Indicates questionable events that occurred since previous STAT:QUES? query. Returns the value of the Questionable Event register (see Table B-3). The Questionable Event register is a read-only register which holds (latches) all events. Reading the Questionable Event register clears it. (See example, Figure B-6.
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Description: Sets selected power supply GPIB address. (See PAR. 3.3.5.2 and Figure 3-2 for special programming considerations.) B.70 SYSTem:COMMunication:GPIB:ADDRess? QUERY Syntax: SYST:COMM:GPIB:ADDR? Short Form: SYST:COMM:GPIB:ADDR? Long Form: SYSTem:COMMunication:GPIB:ADDRess? Return Value: 1 to 31 Description: Returns selected power supply GPIB address. B.
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Description: Enables (1 or ON) or disables (0 or OFF) prompt (see PAR. 3.5.3.2). Sending 1 or ON causes the unit to return > character after the command is parsed. (See PAR. 3.3.5.2 and Figure 3-2 for special programming considerations.) B.78 SYSTem:COMMunication:SERial:PROMpt? QUERY Syntax: SYST:COMM:SER:PROM? Short Form: SYST:COMM:SER:PROM? Long Form: SYSTem:COMMunication:SERial:PROMpt? Return Value: {1 | 0} Description: Returns 1 when prompt is enabled (ON) or 0 when disabled (OFF). (See PAR. 3.5.
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Description: Identifies whether keypad is locked or unlocked. 0 = keypad unlocked, local operation possible by pressing LOCAL key. 1 = keypad locked, LOCAL key disabled, only remote operation possible. Related Commands: SYST:KLOCK. (See example, Figure B-7.) SYST:VERS? SYST:KLOC ON SYST:KLOC? SYST:KLOC OFF Returns 2003.0. keypad locked, only remote control possible. Returns 1 indicating keypad locked. keypad unlocked, pressing LOCAL key allows Local mode operation. Returns 0 indicating keypad unlocked.
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Description: Sending TRIG:SOUR activates either internal (BUS) or external (EXT) trigger. When the external trigger (ground) is applied to J2 pin 3, output voltage and current are set to previously stored values for VOLT:TRIG and CURR:TRIG. NOTE: If INIT:CONT 1 was sent prior to sending TRIG:SOUR EXT, continuous mode is disabled and unit will wait for INIT:IMM TABLE B-4. ERROR MESSAGES ERROR MESSAGE 0,“No error” ESR ERROR BIT SET (SEE PAR. A.
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TABLE B-4. ERROR MESSAGES (CONTINUED) ERROR MESSAGE ESR ERROR BIT SET (SEE PAR. A.5) EXPLANATION -282,”Illegal program name” Execution error bit 4 Executing prog:run without LIST:SEQ command -301,”Value bigger than limit” Device Error bit 3 (1) Requesting a time of 656 which is bigger than limit -311,”Memory error” Device Error bit 3 (1) Power-up NV RAM error -314,”Save/recall memory error” Device Error bit 3 (1) Using cell other than 1 - 41 for SAV and RCL -341,”Non Volatile Mem.
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