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5700A/5720A Series II Calibrator
Service Manual
3-28
3-18. DC Voltage Verification Test
The following test checks every dc voltage range by testing the output accuracy at
decade values of voltage from 100 mV to 1000V. Use Table 3-18 (5720A) or Table 3-19
(5700) for the test record. Table 3-5 lists equipment required for this test as well as the
Linearity Test that follows. See Table 3-15, Minimum Use Requirements, for equipment
substitution information.
Table 3-5. Equipment Required for DC Voltage Testing
Equipment Model
DC Reference Standard Fluke 732B
Reference Divider Fluke 752A
Null Detector EM Electronics 11 (Fluke 845A)
Low Thermal Cables 5440A-7002
5440A-7003
Note
The 5440A-7002 or 5440A-7003 is for the 5700A; the 5720A uses only the
5440A-7003.
Proceed as follows to perform the dc voltage verification test:
1. Self-calibrate the reference divider in accordance with its instruction manual prior to
proceeding.
2. Connect the equipment as shown in Figure 3-5.
3. Set the reference divider to 0.1V. Set the Calibrator to the certified value of the dc
reference standard divided by 100. For example, if the certified value of the dc
reference standard is 10.000007V, set the Calibrator to 100.00007 mV.
4. Press OPR/STBY. After the reading has settled, verify that the null detector reads 0V
±1.20 µV (5720A 90-day specification) or 0V ±1.45 µV (5700A 90-day
specification). Set the Calibrator to standby.
5. Repeat the above process to test each dc voltage range output listed in Tables 3-23 or
3-24. (0.1V is in the table for completeness; you do not need to repeat it.) After the
null detector reading stabilizes, ensure that any observed meter rattle (over and
above the null detector rattle in the "zero" position) over a ten-second period does
not exceed the amount shown in the last column. In each case, set the 5720A to
standby before changing to the next voltage settings and go back to operate before
reading the null detector.
6. Reverse the connections of the dc reference standard at the reference divider and
repeat the previous measurement process for the -0.1V, -1V and -10V outputs.