Ac Volts Calibration And Test - HP 3478A Technical Manual

3478A
4-92. Equipment Required.
required test equipment for the DC Current Calibration
and Test.
Digital Voltmeter (-hp- Model 3456A)
DC Volts Standard (Systron Donner Model M107)
AC-DC Current Calibrator (Valhalla Model 2500)
4-93. Calibration and Test Procedure.
following:
a. Reset the 3478A by pressing the blue Shift button
and then the SGL/TRIG (TEST/RESET) button.
b. Make sure the front panel CAL ENABLE Switch is
set to the calibration enable position (the slot of the
switch is in the vertical position).
c. (Step #1.) Set the 3478A's to the DC Current
Function and the 300mA Range.
d. Set the multimeter to the Single Trigger Mode by
pressing the SGL/TRIG button.
e. Short the 3478A's A (Amps) Terminal to the LO
INPUT Terminal.
f. Press the blue Shift button and then the LOCAL
(CAL) button.
g. Press SGL/TRIG button once.
h. (Step #2.) Set the 3478A to the 3A Range.
i. Calibrate the 3478A by doing the procedure in steps
f and g.
j. Remove the short from the 3478A.
k. Set the DC Volts Standard for a + IV output.
I. Set the Digital Voltmeter to the DC Volts Function,
IV Range, and 6 Digit Display mode.
m. Set the AC-DC Current Calibrator to the 100mA
Range.
n. Connect the DC Volts Standard and Digital
Voltmeter to the AC-DC Current Calibrator as shown in
Figure 4-4.
o. (Step #3.) Set the 3478A to the 300mA Range and
calibrate the 3478A by doing the procedure in steps f and
g.
p. (Step #4.) Set the 3478A to the 3A Range and the
AC-DC Calibrator to the IA Range.
q. Calibrate the 3478A by doing the procedure in
steps f and g.
The following is the
Do the
r. Since the performance checks are the same as the
calibration points, the checks are not required. Remove
the DC Volts Standard and Digital Voltmeter from the
AC-DC Current Calibrator and remove the calibrator
from the 3478A. This completes the 3478A's DC Current
Calibration and Test.

4-94. AC Volts Calibration and Test

4-95. The AC Volts Function is calibrated using only one
calibration source, 3V at 1KHz. With the 3V AC signal
applied, the 3478A determines the gain constants by
taking a measurement in the 3V Range and 30V Range.
The measurement in the 3V Range is a full-scale
measurement and the 30V Range is a 1/10 scale
measurement. The ranges are automatically selected by
the multimeter.
4-96. Make sure the DC Volts Calibration and Test
(paragraph 4-86) has been done before doing the AC
Volts Calibration and Test. Refer to Table 4-10 for the
AC Volts Calibration Signals, Performance Test Signals,
and Performance Test Limits. Each step in the table is
shown in parenthesis in the procedure. All test signals
are applied to the 3478A's HI and LO INPUT Terminals.
4-97. Equipment Required.
equipment for the AC Volts Calibration and Test is an AC
Calibrator (Fluke Model 5200A/5215A option 05).
4-98. Calibration and Test Procedure.
following:
a. Reset the 3478A by pressing the blue Shift button
and then the SGL/TRIG (TEST/RESET) button.
b. Make sure the front panel CAL ENABLE Switch is
set to the calibration enable position (the slot of the
switch is in the vertical position).
c. (Step #1.) Set the 3478A's to the AC Volts Function
and the 3V Range.
d. Set the multimeter to the Single Trigger Mode by
pressing the SGL/TRIG button.
e. Set the AC Calibrator for a 3V at 1KHz output and
connect it to the 3478A's INPUT Terminals.
f. Press the blue Shift button and then the LOCAL
(CAL) button.
g. Using the 3478A's Uprange and/or Downrange
buttons, adjust the reading on the multimeter until it
agrees with the output value of the AC Calibrator (if the
output value is known).
h. Press the SGL/TRIG button once.
4-16
TM 11-6625-3071-14
The required test
Do the