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Section V
PERFORMANCE TESTS
Model 3465B
value of Ra as directed in Table 5-6 and install the part
number indicated in Table 5-1. A resistor decade box WILL
NOT provide the accuracy required of Ra because of the
introduction of wire-wound resistor inductance by the de
cade box).
b. Set the AC Calibrator frequency to the desired test
frequency indicated in Table 5-6.
c. Adjust the AC Calibrator amplitude for a 3450B
Digital Voltmeter display as indicated in Table 5-6 for the
range and current level being tested.
d. REMOVE the 3450B Digital Voltmeter from the test
setup.
e. Verify the Multimeter Display Limits as indicated in
the last column of Table 5-6.
f. Reconnect the 3450B Digital Voltmeter as shown in
Figure 5-3.
g. Repeat Steps b through f for each frequency of each
range and current level listed in Table 5-6. Change Ra as
indicated for each current level.
NOTE
The procedures up to this point have verified
the accuracy of all circuitry associated with the
ac current ranges, except the 200 mA and 2 A
shunts and their associated wiring. Even though
the following steps do not check these shunts
over the 40 Hz to 1 kHz frequency range, it is
considered adequate. An alternate procedure is
offered to cover the full current frequency
combination.
h. To check the 200 mA and 2 A ranges, it is necessary
to use an ac current source capable of these current outputs
such as the 6920B Meter Calibrator. Set the 6920B OUT
PUT switch to OFF and replace the AC Calibrator with the
6920B.
i. Set the 6920B FUNCTION switch to AC and RANGE
switch to 100 milliamperes. Adjust the digital potentio
meter readout control to provide a 10 mA output.
j. Set the OUTPUT SWITCH to ON HOLD. Verify Mul
timeter Display Limits shown in Table 5-7.
k. Return the 6920B OUTPUT SWITCH to OFF before
changing ranges. Adjust the 6920B for the 100 mA range
outputs listed in Table 5-7 and verify the Multimeter Dis
play Limits.
1. Change Multimeter range to 2000 mA and verify Mul
timeter Display Limit for the 100 mA input.
m. With the 6920B OUTPUT switch at OFF, change the
6920B range to lA. Check the Multimeter Display Limits
for the 500 mA and 1000 mA inputs indicated in Table 5-7.
5-16. Alternate AC Ammeter Accuracy Test (200 mA/
2000 mA, 40 Hztol kHz).
5-17. Hewlett-Packard Models 201C, 6825A, 5450B and
precision discreet resistors are required for this test.
NOTE
A 0.1 n (100 MElj resistor is used as the cur
rent sensor. Inaccuracies may be introduced
due to contact resistances. Due precautions
must be exercised to attain required accuracies.
Table 5-6. AC Ammeter Accuracy Test, 200 pA through 20 mA Ranges.
Multimeter
Range
3450B
Digital Voltmeter
Display
Indication
AC
Calibrator
Frequency
Ra
Value
Current
Level
Multimeter
Display Limits
200 mA
40 Hz and 400 Hz
1 kHz, 5 kHz, 10 kHz
15 kHz and 20 kHz
100 kn ±
.1%
10 aA
9.91-10.09
aA
9.92- 10.08
aA
9.79-10.21
aA
.99985 to 1.00015
40 Hz and 400 Hz
1 kHz, 5 kHz, 10 kHz
15 kHz and 20 kHz
10 ktJ ±
.1%
100 aA
99.55 - 100.45 aA
99.70 - 100.30 aA
99.25 - 100.75 aA
9.9985 to 10.0015
40 Hz and 400 Hz
1 kHz, 5 kHz, 10 kHz
15 kHz and 20 kHz
40 Hz and 400 Hz
1 kHz, 5 kHz, 10 kHz
15 kHz and 20 kHz
100 kn +
10 kn +
.1%
.1%
.1 mA
1 mA
.0991 -.1009
mA
.0992-.1008
mA
.0979 -.1021
mA
.9955 - 1.0045 mA
.9970 - 1.0030 mA
.9925 - 1.0075 mA
20 mA
40 Hz and 400 Hz
1 kHz, 5 kHz, 10 kHz
15 kHz and 20 kHz
10 krt ±
0.1%
1 mA
.991 - 1.009
mA
.992 - 1.008
mA
.979 - 1.021
mA
9.9985 to 10.0015
40 Hz and 400 Hz
1 kHz, 5 kHz, 10 kHz
15 kHz and 20 kHz
1 kn ±
.1%
10 mA
9.955 - 10.045 mA
9.970 - 10.030 mA
9.925 - 10.075 mA
54
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