Operating Manual Agilent Technologies Electronic Load Mainframes Models 6050A and 6051A For instruments with Serial Numbers: Agilent 6050A-2908A-00101 and Above Agilent 6051A-2927A-00101 and Above Agilent Part No. 5959-3368 Microfiche Part No.
CERTIFICATION Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau’s calibration facility, and to the calibration facilities of other International Standards Organization members.
SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the customer’s failure to comply with these requirements. BEFORE APPLYING POWER.
SAFETY SUMMARY (continued) GENERAL Any LEDs used in this product are Class 1 LEDs as per IEC 825-l. ENVIRONMENTAL CONDITIONS This instruments is intended for indoor use in an installation category II, pollution degree 2 environment. It is designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range.
DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Agilent Technologies, Inc. Manufacturer’s Address: New Jersey Division 150 Green Pond Road Rockaway, NJ 07866 U.S.A.
If you are a first-time user, start with this manual, paying particular attention to Chapter 2. After installation (Chapter 3), read Chapter 4 to learn front-panel operation. Programming users should then read Chapter 5 before going to the Programming Reference Guide. Experienced programming users will probably refer only to the Programming Reference Guide. Agilent 6050A/6051A Operating Manual Agilent Part No.
Table of Contents 1. General Information What’s in this Manual ................................................................................................................................11 Options ..................................................................................................................... ..................................11 Safety Requirements...................................................................................................................................
Table of Contents (continued) Overcurrent..............................................................................................................................................29 Overpower...............................................................................................................................................29 Overtemperature......................................................................................................................................30 Reverse Voltage ...
Table of Contents (continued) Examples .................................................................................................................................................56 Setting CR Values ...................................................................................................................................57 Programming Ranges ..............................................................................................................................57 Examples ...............
1 General Information What’s In This Manual This manual applies to both the Agilent 6050A and Agilent 6051A Electronic Load mainframes. The two mainframes are functionally identical, but the Agilent 6051A is a half-rack width unit, with only two slots for load modules. Most of the information given in this manual applies to both mainframes.
Safety Requirements This product is a Safety Class 1 instrument, which means that it is provided with a protective earth ground terminal. This terminal must be connected to an ac source that has a 3-wire ground receptacle. Review the instrument rear panel and this manual for safety markings and instructions before operating the instrument. Refer to the Safety Summary page at the beginning of this manual for a summary of general safety information.
Table 1-1. Agilent 6050A/6051A Specifications and Supplemental Characteristics (continued) Weight: Net (mainframe only): Agilent 6050A, 9.5 kg (21 lb.) Agilent 6051A, 5.5 kg (12 lb.) Shipping: Agilent 6050A, 14 kg (31 lb.) Agilent 6051A, 7.5 kg (17 lb.) Dimensions: Width: Height: Depth: Agilent 6050A, 425.5 mm (16.75 in.) Agilent 6051A, 213 mm (8.4 in.) 178 mm (7 in.), add 10 mm (0.4 in.) for removable feet 625 mm (24.6 in.
2 Operation Overview Introduction The Agilent 6050A and Agilent 6051A Multiple Input Electronic Load Mainframes are used for design, manufacturing, and evaluation of dc power supplies, batteries, and power components. Other applications include use as a power circuit breaker or crowbar, high-current function or pulse generator, fuel-cell and photovoltaic cell test, and de-energizing superconducting magnets. The mainframe contains six (two) slots for load modules.
Front Panel Description The front panel includes a 12-character alphanumeric display, 11 status indicators, and four groups of keypads. Ordinarily the alphanumeric display shows the number of the channel presently under front-panel control, and the input voltage and current of that channel. By using the key you can sequentially display input power, programming error codes, and protection-circuit status. If any protection circuits are active, that status will be displayed first when you use the key.
operation, protection features, and other operating features of the Electronic Load. Extended Power Operation Note: Extended power operation is not available on "B " load modules (Agilent Models 60501B-60507B). In addition, this feature may not be present in "A" modules produced after 1989. The extended power feature allows a module to dissipate considerably more than its nominal power rating in many cases.
When programmed to a mode, a module remains in that mode until the mode is changed or until a fault condition, such as an overpower or overtemperature, occurs. When changing modes, the module’s input is momentarily disabled (non-conducting state) before the new mode is enabled. This insures that there will be minimum overshoots when changing modes. The current, resistance, and voltage mode parameters described in subsequent paragraphs can be programmed whether or not the mode is presently selected.
Electronic Load are described later in this chapter. The Electronic Load has a status reporting capability to keep track of pending triggers and other operating conditions. The status reporting capability is described in detail in the Agilent Electronic Loads Programming Reference Guide. Transient Current Level The transient current level can be set at the front panel ( , and ENTRY keys) or via the GPIB (CURR:TLEV command).
Ranges Resistance may be programmed in any of three overlapping ranges (low, middle, high). The range can be set at the front , , and ENTRY keys) or via the GPIB (RES:RANG command). Any value in the low range selects panel ( the low range. Any value that is within the middle range and above the maximum low-range value selects the middle range. Any value that is within the high range and above the maximum middle-range value selects the high range.
Figure 2-4. Constant Voltage Mode Immediate Voltage Level and ENTRY keys) or via the GPIB (VOLT command). If the CV The voltage level can be set at the front panel ( mode is the active mode, the new setting immediately changes the input at a rate determined by the voltage slew setting. If the module is not in the CV mode, the new setting is saved for use when the mode is changed to CV.
Continuous Transient Operation In continuous operation, a repetitive pulse train switches between two load levels. Continuous transient operation is selected via the GPIB using the TRAN:MODE CONT command. For front panel operation, continuous transient operation is automatically selected when transient operation is turned on( key). The two load levels in the transient operation are the previously described main level (immediate or triggered) and transient level for current, resistance, or voltage.
b. One pulse results from each trigger. Therefore, frequency cannot be programmed. The main level, transient level, and slew rate are programmed as described for continuous operation. The pulse width is programmable from 0.00005 to 4 seconds via the GPIB (TRAN:TWID command). Pulsed transient operation cannot be programmed at the front panel. c. The appearance of the pulse at each module’s input may be delayed from the trigger signal. For pulse widths of 17 ms or greater, delay is less than 1.
HPSL Command Description TRIG:SOUR EXT TRAN:MODE TOGG CURR 5 CURR:TLEV 10 TRAN ON Selects the external trigger input source. Selects toggled operation. Sets main current level to 5 amps. Sets transient current level to 10 amps. Turns on transient operation. Figure 2-7 shows the waveform that would result for this toggled transient operation example.
The rear-panel TRIGGER connector also provides a trigger output signal. This signal is generated synchronously with the trigger signal sent by the mainframe to the modules. The trigger output signal can be used to trigger an external device such as an oscilloscope, DVM, or another Electronic Load mainframe. The Electronic Load has a status reporting capability to keep track of trigger operations. Refer to ’Status Reporting’ in the Agilent Electronic Loads Programming Reference Guide.
Input Current, Voltage, and Power Measurement key) or via the GPIB (MEAS Each module’s input current, voltage, and power can be measured at the front panel ( command). With local (front panel) control in effect, pressing will continually step the display through voltage and current input values, the computed power value, and various status conditions for the selected channel.
The actual value of the electronic short is dependent on the mode and range that are active when the short is turned on. In CV mode it is equivalent to programming zero volts. In CC mode it is equivalent to programming full-scale current for the present current range. In CR mode it is equivalent to programming the minimum resistance for the present resistance range.
key) reads back the errors in the order in which they occurred (the error queue can hold The SYST:ERR? query (or up to 30 entries). Once the error is read back it is removed from the list. A value 0 indicates there is no error; and 0 will be returned when all errors in the list have been read. Pressing the key displays just the error number. The SYST:ERR? query returns the error number and a short description of the error to the computer.
Overvoltage The overvoltage protection circuit is set at a predetermined voltage, which cannot be changed. If the overvoltage circuit has tripped, the module will attempt to limit the voltage by drawing current from the DC source. The module limits the value of current drawn such that the resulting power is within the power rating. The overvoltage (OV) and voltage fault (VF) status register bits are set when the OV condition occurs, and will remain set until they are reset as previously described.
If the hardware power-limit circuit becomes active, it attempts to limit power by limiting the current drawn by the load. Once the power has been returned to the safe operating area, the protective circuit allows the current to rise again. This protective sequence can turn on and off (approximately 5% of full scale peak-to-peak) at rates from 2 kHz to 12 kHz.
External Programming Input CC and CV modes can be programmed with a signal (ac or dc) connected to the Ext Prog input. A 0-to-10V external signal corresponds to the 0-to-full scale input range in CV mode or in CC mode. The external programming signal is combined with the value programmed via the GPIB or the front panel, so that, for example, a programmed value of one-half full scale and a 5-volt external programming input would produce a full-scale value at the input.
3 Installation Introduction This chapter discusses how to install the modules and make connections to the rear panel of your Agilent 6050A or Agilent 6051A Electronic Loads. A turn-on checkout procedure as well as application considerations for specific operating modes are also discussed. Inspection When you receive your Electronic Load, inspect it for any obvious damage that may have occurred during shipment. If there is damage, immediately notify the carrier and the nearest Agilent Sales Office.
has only enough room for two single-width modules or one double-width module. The module installation procedure is the same for both mainframes. Figure 3-1. Power Cord Configurations Procedure 1. With the mainframe off, disconnect the power cord and remove the top cover by loosening the thumbscrews. 2. Remove any packing material from inside the mainframe. 3. Grasp the module using the quarter-turn locking fastener and the input binding posts.
5. Lock the module in place using the quarter-turn locking fastener and the rear panel thumbscrew. Handtighten only. 6. Connect the three ribbon cables to the adjacent connector pins in the GPIB board (or adjacent module). Make sure the connectors are properly seated. 7. If applicable, install each additional module in the slot next to the previous module in the same manner (go back to step 3). 8. Replace the top cover after all modules are installed. Note Fully hand-tighten the cover thumbscrew.
Cooling The Electronic Loads can operate without loss of performance within the temperature range of 0° to 40°C, and with derated performance from 40° to 55° C. However, you must install your Electronic Load in a location that allows sufficient space at the top, sides, and rear of the unit for adequate air circulation. Variable-speed fans cool the unit by drawing in air through the top and sides and exhausting it out the back. You must leave at least 1.5 cm (0.5 in.
• • Check that the unit has been factory set to the correct line voltage. Refer to the factory check mark on the rear panel LINE label next to the power connector. Check that the power cord is connected to the ac input socket. SHOCK HAZARD The power cord provides a chassis ground through a third conductor. Be certain that your power outlet is of the three-conductor type with the correct pin connected to earth ground (see Figure 3-1).
Turn-On/Selftest Turn on the Electronic Load using the LINE switch on the front panel and observe the display. Immediately after turn-on, the Electronic Load undergoes a selftest that checks the GPIB interface board as well as the input circuitry of the installed modules. All of the front panel LCD segments are momentarily activated. When selftest completes, the display should appear about the same as the one shown in Figure 3-6 with the CC annunciator being on. Figure 3-6.
Power Test Note The following checkout assumes that the Electronic Load is set to the factory defaults. Refer to Chapter 4 if you need to recall the factory default values. Use a power supply with the voltage set to 10 V and the current limit set to 10 A to check the input circuit on each module. The settings of the power supply and the values used in the procedure were selected so that they can be used with any module.
GPIB Address The GPIB address of the Electronic Load is factory set to address 5. The GPIB address can only be set using the front panel and ENTRY keys. Chapter 4 explains how to change the GPIB address. Rear Panel Connectors and Switches Figure 3-8 shows the rear panel of the Agilent 6050A Electronic Load. The input binding posts, control connectors, and trigger connector are used for application connections. Figure 3-8.
3. Hand tighten the adjustment knob to secure the wire in the binding post. If you are using a slotted screwdriver, tighten the knob to 8 in. -lbf for a secure connection.. Do not use lubricants or contact cleaners on the binding posts. Certain chemical agents can damage the LEXAN material of the binding post, causing the part to fail. Figure 3-9.
Figure 3-10. Control Connector and Cover +Sand -S Used to connect the remote sense leads to the power source. Pin + S connects the + S signal and pin - S connects the - S signal. Remote sensing can only be used in CV and CR modes. IM and VM (pins Al and A2) Used to monitor the module’s input current and voltage. A 0 V-to-10 V signal at the appropriate pin indicates the zero-to-full scale current or voltage. Pin Al monitors current (IM); pin A2 monitors voltage (VM).
Trigger Connector A four-pin connector and a quick connect mating plug (Agilent part number 1252-1488) are provided on each mainframe for input and output trigger signals (see Figure 3-11). The mating plug is packaged in an envelope that is included with the mainframe. Consistent with good engineering practice, all leads connected to the trigger connector should be twisted and shielded to maintain the instrument’s specified performance.
Wire Size AWG 22 20 18 16 14 12 10 8 6 4 Table 3-1. Stranded Copper Wire Ampere Capacity Ampacity Notes: 1. Ratings for AWG-sized wires derived from MIL-W-5088B. Cross Section Ratings for metric-sized wires derived from IEC Publication Area in mm2 5.0 33-51. 8.33 . 0.75 10 15.4 2. Ampacity of aluminum wire is approximately 84% of that 1 13.5 listed for copper wire. 19.4 1.5 16 3. When two or more wires are bundled together, ampacity 31.2 for each wire must be reduced to the following percentages: 2.
Wire Size AWG 22 Cross Section Area in mm2 Table 3-2. Maximum Wire Lengths to Limit Voltage Drops Resistivity Maximum Length in Meters (Feet) to Limit Voltage Drop to 0.5 V or Less Ω/kft 16.15 0.5 20 40.1 10.16 0.75 18 26.7 6.388 1 16 20.0 4.018 1.5 14 13.7 2.526 2.5 12 8.21 1.589 4 10 5.09 0.9994 6 8 3.39 0.6285 10 6 1.95 0.3953 16 4 Ω/km 1.24 0.2486 5A (6) 2.5 (9.5) 3.7 (15.5) 5.0 (24.5) 7.3 (39.5) 12.2 (62.5) 19.6 (100) 29 (159) 51 (252) 80 (402) 10 A (3) 1.2 (4.5) 1.9 (7.5) 2.
Figure 3-12. Local Sensing Figure 3-13.
Figure 3-14. Parallel Operation Figure 3-15.
4 Local Operation Introduction Chapter 2 Operation Overview introduced you to the Multiple Electronic Load’s features and capabilities and briefly described how to control a module locally from the front panel and remotely with a computer via the GPIB. This chapter describes in greater detail how to operate the Multiple Electronic Load from the front panel.
Item 3 Electronic Load Status Annunicators Table 4-1. Controls and Indicators (continued) Description CC-Indicates the selected channel is in the constant current (CC) mode. Note that Figure 4-1 illustrates that channel 1 is in the CC mode (CC annunciator is on). CR-Indicates the selected input channel is in the constant resistance (CR) mode. CV-Indicates the selected input channel is in the constant voltage (CV) mode. Tran-Indicates that transient operation is enabled for the selected input channel.
Item 6 CHAN Keys Table 4-1. Controls and Indicators (continued) Description Used in conjunction with the ENTRY keys to select a channel (module) for front panel control and/or display. - Identifies which module is installed in the selected input channel. and 7 FUNCTION Keys Increment( ) and decrement ( ) the channel number. - Returns the display to the metering function.
Item 7 FUNCTION Keys (continued) Table 4-1. Controls and Indicators (continued) Description - Displays the selected channel’s active mode: CC (MODE CURR), CR (MODE RES), or CV (MODE VOLT). The active mode can be changed using the CURR, RES, or VOLT key followed by the Enter key. - Displays the selected channel’s main current setting (e.g. CURR 3.275). This setting can be changed using the ENTRY keys. The CURR key also selects the CC mode (MODE CURR) in conjunction with the MODE and Enter keys.
With local control in effect, you can select a channel and use the front panel display to view the input voltage/current values and the computed power value as well as certain fault and status conditions that may be present. This is referred to as the metering mode. The display can also be used to view the programmed settings of the selected channel by pressing the applicable FUNCTION keys. You can change these settings using the ENTRY keys. This is referred to as the programming mode.
Selecting the Channel You can select a channel in either of two ways: 1. You can use the Channel key in conjunction with the ENTRY keys to select a channel. For example, to select channel 1 press: 2. You can use the and keys to increment ( ) and decrement ( ) the channel number. The new channel number is selected immediately- Identifying the Selected Channel The Ident key is used to identify which module is installed in the selected channel. For example, with channel 1 selected, and observe the display.
Figure 4-2.
Note The CC, CR, and CV values described in subsequent paragraphs can be programmed whether or not the associated mode is active. When a mode is selected, all of the associated values will take effect at the input provided that the input is turned on. Setting the Mode of Operation The present (active) mode of operation is indicated by the appropriate annunciator being on (e.g. CC). The active mode can .
b. c. 2. Select the low range by pressing Press and check that the display indicates "C:RNG" and the maximum low range value. This means that the low range is selected. Set Main Level and note that the display indicates "CURR" and the minimum low range CC value. a. Press b. Set the main current level to 1 amp by pressing c. Press again and check that the display indicates "CURR 1.0000". ENTRY keys to increment ( ) or decrement ( ) the main level CURR setting.
"RES 50.000" - main level is 50 ohms. "R:TLV 40.000" - transient level is 40 ohms. "C:SLW.50000" - slew rate is 0.5 A/µs (middle resistance range uses the CC slew rate setting). If you now select the low range (0 to 1 ohm, R:RNG 1.0000), the settings will automatically be changed to fit into the new range as follows: "RES 1.0000" - main level is 1 ohm (max value low range). "R:TLV 1.0000" - transient level is 1 ohm (max value low range). "V:SLW 5.
and the maximum voltage slew rate. The Multiple Electronic Load automatically selects the voltage slew rate when the low resistance range is selected. 4. b. Set the slew rate to 0.25 V/µs by pressing c. Press and again and check that the display indicates "V:SLW 0.2500" (or the closest slew rate step to this value for the particular module being programmed). Set Transient Level - The transient resistance level is meaningful only if transient operation (described later) is turned on.
You can see the VOLT setting being incremented or decremented each time you press the applicable Input key. The values are entered automatically (you don’t press the Enter key). Remember if the CV mode is active, the incremented or decremented values will immediately change the actual input. 2. Set Slew Rate - There are 12 discrete steps within the voltage slew range. The Multiple Electronic Load automatically selects one of the 12 slew rates that is closest to the programmed value.
1. Setup CC Values a. Set the main CC level to 1 amp, the transient CC level to 2 amps, and the slew rate to 0. 15 A/µs. See examples under Setting CC Values. b. Turn on CC mode by pressing: 2. Set frequency to 5 kHz by pressing: 3. Set duty cycle to 25% by pressing: (blue shift key) (shifted) 4. Turn on transient operation by pressing: 5. Note that the Tran annunciator is on. Shorting The Input The Multiple Electronic Load can simulate a short circuit across any input channel.
Using The System Keys These keys consist of Local, Address, Error (shifted Address key), Recall, Save (shifted Recall key), and the blue shift key (bottom key in the SYSTEM column). The Local key and the Shift key have already been discussed. The remaining SYSTEM keys are described in the following paragraphs. Setting The GPIB Address Before you can program the Multiple Electronic Load remotely via a GPIB computer, you must know its GPIB address. You can find this out by pressing .
Settings stored in registers 1 through 6 will be lost when the Electronic Load’s power is cycled. When power is turned off and then on again, each of these registers (1 through 6) will be set to the "wake-up" values. The "wake-up" values are stored in register 0 and can be set to any values you desire (see Changing Wake-up Settings below). Changing "Wake-up" Settings The "wake-up" settings for all channels are stored in register 0.
5 Remote Operation Introduction Chapter 4 - Local Operation described how to program the Multiple Electronic Load manually using the front panel keys. This chapter describes the fundamentals of programming the Multiple Electronic Load remotely from a GPIB controller The similarities between local and remote programming will become apparent as you read this chapter.
Sending A Remote Command To send the Multiple Electronic Load a remote command, combine your computer’s output statement with the GPIB interface select code, the GPIB device (Multiple Electronic Load) address, and finally the Multiple Electronic Load’s HPSL command.
Remote Programming Commands The Multiple Electronic Load command set consists of more than 60 HPSL compatible commands. The HPSL commands have many optional key words which can be used to document your programs. Most of the commands have a query syntax which allows the present parameter settings to be read back to the controller. All of these details are given in the Electronic Load Family Programming Reference Guide.
indicated by the value 9.9E + 37 instead of the normal voltage or power readings. This is the IEEE 488.2 value for positive infinity. CC Mode Example This example selects channel 1, sets the current level to 1.25 amps and then reads back the actual current value. 10 OUTPUT 705; "CHAN 1" 20 OUTPUT 705;"INPUT OFF" 30 OUTPUT 705;"MODE:CURR" 40 OUTPUT 705;"CURR:RANG MIN" 50 OUTPUT 705;"CURR 1.
Figure 5-1.
Figure 5-1.
CR Mode Example This example selects channel 1, sets the current protection limit to 2 amps, programs the resistance level to 100 ohms, and reads back the computed power. See Appendix A for considerations regarding high-resistance applications.
Pulsed Transient Operation Example This example selects channel 1, sets the CR levels, selects the bus as the trigger source, sets the fastest slew rate, programs a pulse width of 1 millisecond, and turns on transient operation. When the *TRG command is received, a 1 millisecond pulse is generated at the channel 1 input.
140 OUTPUT 705; "TRIG:SOUR TIM" 150 END Line 10: Line 20: Line 30: Line 40: Line 50: Line 60: Line 70: Line 80: Line 90: Line 100: Line 110: Line 120: Line 130: line 140: Selects channel 1 and turns the input off. Selects the CV mode. Sets the main voltage level to 5 volts. Sets the transient voltage level to 10 volts and the voltage slew rate to maximum. Selects toggled transient operation. Enables transient operation and turns on the channel 1 input. Selects channel 2 and turns the input off.
6 Calibration Introduction This chapter describes the calibration procedures for the Agilent 6050A and 6051A Electronic Load mainframe and its associated modules. Both "A" modules (Agilent Models 60501A-60504A) and "B" modules (Agilent Models 60501B60507B) are covered in separate procedures. The Electronic Load should be calibrated annually, or whenever certain repairs are made (refer to the Service Manual).
Equipment Shunts Voltmeter Power Supply Controller Table 6-1. Equipment Required for Calibration Characteristics Recommended Model Guildline 9230/15 0.1 Ω @ 15 A, 0.04% @ 25 W Guildline 9230/100 0.01 Ω @ 100 A, 0.04% @ 100 W Guildline 9230/300 0.001Ω @ 300 A, 0.04% @ 100 W dc accuracy of 0.01%, 6 digit readout Agilent 3456A or equivalent 60 Vdc/l20 Adc minimum Agilent 6032A or Agilent 6035A and PARD < 3 mV rms/30 mv pp Agilent 6031A, or equivalent GPIB (IEEE-488) Agilent BASIC (2.
CALibration:SAVE Writes the present calibration constants into the EEprom. This command does not have to be sent until all ranges and modes have been calibrated. If the unit is turned off before CAL:SAVE is sent, the new calibration constants are lost. Calibration Flowcharts The flowcharts in Figures 6-2 and 6-3 describe the calibration procedures for "A" and "B" modules, respectively. They correspond to the example calibration programs.
Figure 6-2.
Figure 6-2.
Figure 6-2.
Program Listing for "A" Modules 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 Load=705 Chan= 1 OUTPUT Load;"CHAN";Chan;";CAL ON" Cal_curr(Load,Chan,Hi_curr_rng,Hi_curr_hipt,Hi_curr_lopt,l); Cal_curr(Load,Chan,Lo_curr_rngLo_cu,rr_hipt,Lo_curr_lopt,0) Cal_volt(Load,Chan,Volt_hipt,Volt_lopt) Cal_res(Load,Chan,Lo_res_rng,Lo_res_hipt,Lo_res_lopt,0) Cal_res.
Program Listing for "A" Modules (continued) 510 520 530 540 550 560 570 580 590 600 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850 860 870 880 890 900 910 920 930 940 950 960 970 980 990 1000 1010 1020 82 PRINT "VOLTAGE CALIBRATION" PRINT "Set power supply according to module calibration table" PRINT "Press CONTINUE when ready" PAUSE OUTPUT Load;"CHAN";Chan OUTPUT Load;"MODE:VOLT" OUTPUT Load;"VOLT";Volt_hipt INPUT "Enter voltage across inputs for high
Program Listing for "A" Modules (continued) 1030 1040 1050 1060 1070 1080 1090 1100 1110 1120 1130 1140 1150 1160 1170 1180 1190 1200 1210 1220 1230 1240 1250 IF Flag THEN OUTPUT Load;"RES";Res_hipt ELSE OUTPUT Load;"RES";Res_lopt END IF OUTPUT Load;"TRAN:MODE TOGG" OUTPUT Load;"TRIG:SOUR BUS" OUTPUT Load;"TRAN ON" IF Flag THEN OUTPUT Load;"RES:TLEV";Res_lopt ELSE OUTPUT Load;"RES:TLEV";Res_hipt END IF OUTPUT Load;"*TRG" INPUT "Enter voltage across inputs for trans.
LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE LINE 84 610 630 640 680 690-700 710-720 730 750 760 820 870-890 900 930-940 950 980-990 1030-1070 1080-1090 1100 1110-1150 1160 1190-1200 1210 Calibration Set low calibration point Send measurement in volts for low main calibration point Send measurement in volts for low readback calibration point Set low calibration point Select transient toggle mode and GPIB trigger source Turn transient mode on an
Figure 6-3.
Figure 6-3.
Figure 6-3.
Program Listing for "B" Modules 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 510 520 88 ASSIGN @Ld TO 705 Chan=l OUTPUT @Ld;”CHAN”;Chan;”;CAL ON" Cal_curr(@Ld,Chan,Hi_curr_rng,Hi_curr_offset,l) Cal_curr(@Ld,Chan,Lo_curr_rng,Lo_curr_offset,0) Cal_volt(@Ld,Chan,Volt_hipt,Volt_lopt) Cal_res(@Ld,Chan,Lo_res_rng,Lo_res_hipt,Lo_res_lopt,0) Cal_res(@Ld,Chan,Mid_res_rng
Program Listing for "B" Modules (continued) 530 540 550 560 570 580 590 600 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850 860 870 880 890 900 910 920 930 940 950 960 970 980 990 1000 1010 1020 1030 OUTPUT @Ld;"*TRG" IF Flag THEN WAIT 30 INPUT "Enter current through shunt for high point in amps",Trpt_curr OUTPUT @Ld;"CAL:TLEV";Trpt_curr OUTPUT @Ld;"TRAN OFF" PRINT "Test unit to verify that transient values are in spec" PRINT "Press CONT when ready to ca
Program Listing for "B" Modules (continued) 1040 1050 1060 1070 1080 1090 1100 1110 1120 1130 1140 1150 1160 1170 1180 1190 1200 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 1310 1320 1330 1340 1350 1360 1370 1380 1390 1400 1410 1420 1430 1440 1450 1460 90 ! SUB Cal_res(@Ld,Chan,Res_rng,Res_hipt,Res_lopt,Flag) PRINT "RESISTANCE CALIBRATION, RANGE";Res_rng PRINT "Set power supply to calibration information table" PRINT "Press CONT when ready to continue" PAUSE OUTPUT @Ld;"CHAN";Chan OUTPUT @Ld;"MODE:
A Considerations For Operating In Constant Resistance Mode The Agilent Electronic Loads implement Constant Resistance. (CR) mode by using either the CV circuits or CC circuits to regulate the input. The low range is regulated with the CV circuits, using the input current monitor as the reference. Therefore, resistance is described by the formula V I =R in which input current I is the reference, and voltage at the input terminals, V, is the parameter controlled to determine the resistance of the load.
If large resistances are required, the accuracy can be improved by reading the voltage and current directly from the load, calculating the actual resistance, and then adjusting the programmed value accordingly. This technique is most practical in applications requiring a fixed resistive load. The following examples illustrate the worst-case error possibilities resulting from op amp offsets. The examples are based on a 300-watt unit having 1 ohm, 1 kilohm, and 10 kilohm ranges.
INDEX A aliases ..........................................................................................................................................................................16 ampere-capacity...........................................................................................................................................................44 annunciators..........................................................................................................................................
INDEX (continued) front panel display .................................................................................................................................................49, 52 FUNCtion ....................................................................................................................................................................16 function keys.....................................................................................................................................
INDEX (continued) O oscillation ....................................................................................................................................................................29 OUTPut .......................................................................................................................................................................16 output statement........................................................................................................................
INDEX (continued) setting CC values .........................................................................................................................................................56 setting CR values .........................................................................................................................................................57 setting CV values.................................................................................................................................
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Manual Updates The following updates have been made to this manual since the print revision indicated on the title page. 4/15/00 All references to HP have been changed to Agilent. All references to HP-IB have been changed to GPIB.