HP 3465B - AC Normal Mode Rejection Test

Model 3465B
PERFORMANCE TESTS
Section V
Table 5-7. AC Ammeter Accuracy Test, 200 mA
and 2000 mA Ranges.
Table 5-8. AC Ammeter Accuracy Test 200 mA
and 2000 mA Ranges.
Multimeter
Range
Output Meter
Calibration
Multimeter
Display Limits
200 mA
10 mA
9.87-10.13 mA
50 mA
49.55 — 50.45 mA
100 mA
99.15 - 100.85 mA
2000 mA 100 mA
500 mA
1000 mA
98.7-101.3 mA
495.5 -504.5 mA
991.5 - 1008.5 mA
a. Connect the equipment as shown in Figure 5-4.
h. Set -hp- Model 6825A to amplifier mode and gain to
X4.
c. Set the Multimeter FUNCTION to ac amps (~A) and
range to 200 mA.
5-18. Refer to Table 5-8 for the following steps.
a. Set -hp- Model 201C to the desired test frequency
indicated.
b. Adjust -hp- Model 201C amplitude for the 3450B
reading indicated.
c. Verify that the Multimeter display is within limits
indicated.
d. Repeat Step c (Paragraph 5-17) and Steps a through c
(Paragraph 5-18) for each frequency and range indicated.
Test
Multimeter -hp- 3450B
Multimeter
Frequencies
Range
Reading
Display Limits
(Hz)
(mA) (V)
200
0.00100 9.87 - 10.13
40
0.00500
49.55 - 50.45
400
0.01000 99.15 - 100.85
1000
2000
0.01000 98.7 - 101.3
0.05000 495.5 - 504.5
0.10000
991.5 - 1008.5
normal-mode voltage to the resultant error in reading.
NMR(db)=201ogio Peak ac superimposed voltage
Effect on reading (peak volts)
An AC Calibrator, an Electronic Counter, a 1 /tF capacitor
("hp- Part No. 0160-3407) and a 22 kfi resistor (-hp- Part
No. 0757-1087) are required for this test.
a. Connect the test equipment as shown in Figure 5-5.
Do not connect the Multimeter at this time.
b. Using the Electronic Counter as a monitor, adjust the
AC Calibrator frequency to 60 Flz ± 0.1%.
c. Set the Multimeter function to DCV ( V) and
range to 20 V. Short the Multimeter input and note the
indication.
d. Disconnect the short and connect the AC Calibrator
to the Multimeter input. Adjust the Calibrator output to
7.07 Vrms (10 V peak).
e. The Multimeter indication should not vary more than
.007 V from the indication noted in Step C. This verifies a
normal-mode rejection of greater than 60 dB.
5-19. AC Normal Mode Rejection Test.
5-20. AC normal-mode rejection is the ratio of the peak
f. Repeat Steps c, d and e for an AC Calibrator output
frequency of 50 Hz ±0.1% as monitored by the Electronic
Counter.
AUDIO
OSCILLATE
hp 20IC*
POWER
AMPLIFIER,
hp 6825A
o o o o
MULTI-FUNCTION
METER ,
hp 3450B
dH
m
o rm
OR EQUIVALENT
LOW INDUCTANCE
Vv^^
>ion
P^ctlR
DIGITAL
MULTIMETER
hp 3^5
JJJJJJ JJJJJJJ
o.in±o^o5% .
GrfR. 1440-9681
3465-B-4672
Figure 5-4. AC Ammeter Accuracy Test 200 mA and 2000 mA.
5-5