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B - Verification and Calibration
68
DC Voltage Programming and Measurement Accuracy
CAUTION: Disconnect the ratio transformer for this test.
This test verifies the dc voltage programming, GPIB readback, and front panel meter functions. Values
read back over the GPIB should be the same as those displayed on the front panel. Connect the negative
terminal of the DVM to the COM output terminal to determine the ± dc offset voltages.
Action Normal Result
1. Make sure the ac source is turned off. Connect the DVM directly
to the sense terminals.
2. Turn on the ac source with no load. In the Output menu, execute
the *RST command to reset the unit. Enable the output by
pressing Output On/Off. Program the output voltage as follows:
VOLT 0, OUTP:COUP DC, OFFSET 425
Output voltage at +425 Vdc
Output current near 0.
3. Record DC voltage readings at the DVM and on the front panel
display.
Readings within specified dc voltage
programming and readback limits.
4.
Program OFFSET
−
425 Output voltage at
−
425 Vdc
5. Record DC voltage readings at the DVM and on the front panel
display.
Readings within specified dc voltage
programming and readback limits.
RMS Current Accuracy Test
This test verifies the accuracy of the current measurement in rms detection mode.
Action Normal Result
1. Turn off the ac source and connect the DVM, the 20 ohm load
resistor and current shunt as shown in Figure B-1 with S1 closed.
Connect the DVM across the current shunt.
2. Turn on the ac source. In the Output menu, execute the *RST
command to reset the unit. Enable the output by pressing Output
On/Off. Program the output as follows:
For Agilent 6811B:
VOLT 50, CURR:RANGE LOW, CURR:LEV 3.00
For all other models:
VOLT 50, CURR:RANGE LOW, CURR:LEV 5.00
CC annunciator on
Output current at 3.0 (Agilent
6811B)
or 5.0 A (all other models).
3. Record the DVM voltage reading and calculate the rms current. Readings within specified limits.
4. Program CURR:RANGE HIGH
CC annunciator on
Output current at 3.0 (Agilent
6811B)
or 5.0 A (all other models).
5. Record the DVM voltage reading and calculate the rms current. Readings within specified limits.