Ac Volts Test; Dc Current Accuracy Test And Calibration - HP 3478A Technical Manual

3478A
i. Connect the DC Volts Standard and Dig Voltmeter to
the AC-DC Current Calibrator as she in Figure 4-4.
j. Connect the AC-DC Calibrator to the 3478A shown
in Figure 4-3.
k. Make sure the reading on the Digital Voltmeter
exactly + IV. Readjust the DC Volts Standard necessary.
l. Check and record the reading on the 3478A.
m. (Step #5.) Set the AC-DC Calibrator to the Range.
Check and record the 3478A's reading.
n. Remove the DC Volts Standard and Digital
Voltmeter from the AC-DC Current Calibrator Remove
the current calibrator from the 3478A. completes the DC
Current Test. If any test fails, calibrating the instrument
(go to paragraph 4-90).
manual's Section VII troubleshooting.

4-59. AC Volts Test

4-60. The AC Volts Test limits are printed on the Volts
Test Card and in Table 4-5. Each step on the card also
corresponds to a step in the procedure ' each step
number shown in parenthesis in the procedure.
4-61. All test signals are applied to the 3478A's HI LO
INPUT Terminals.
4-62. Equipment Required.
equipment for the AC Volts Test is the AC Calibrator (F
Model 5200A, 5215A Option 05). 4-8
4-63. Test Procedure.
Performance Tests have been completed before doing
the AC Volts Test. Also make sure the 3478A has been
Figure 4-4. DC Current Accuracy Test and Calibration
If test still fails, go to this
The required test
Make sure the DC Volts
warmed up for at least one hour, then do the following:
a. (Step #1.) Reset the 3478A by pressing the blue
Shift button and then the SGL/TRIG (TEST/RESET)
button.
b. (Step #2.) Set the 3478A to the AC Volts Function.
c. Set the AC Calibrator for a .03V at 20KHz output.
Connect the output of the calibrator to the INPUT
Terminals of the 3478A.
d. (Step #3 and 4.) Set the 3478A to the 300mV
Range. Check the 1/10 and full scale reading of the
range by applying .03V at 20KHz and .3V at 20KHz,
Table 4-5. AC Volts Test Limits
4-8
TM 11-6625-3071-14