Distortion Check - HP 465A Operating And Service Manual

Model 465A
FREQUENCY RESPONSE
TEST SET
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0
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0
TEST OSCIL LATO R
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651A
465A-B-02'6
c . Set Model 465A GAIN to 20 DB.
d. Set distortion analyzer to METER.
e. Set oscillator frequency to 1 kc; adjust
oscillator output to provide distortion analyzer
(voltmeter) reading of 5 v.
f. Adjust frequency response test set METER
SET control to desired SET LEVEL.
g.
Switch distortion analyzer FUNCTION to
SET LEVEL;METER RANGE to SET LEVEL
and SENSITIVITY for upscale meter deflection.
Adjust VERNIER for full scale reading of 1
(100%).
-hp- Model 465A
Gain
(db)
20
20
20
20
40
40
40
40
01775-1
0
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U
Figure 5-2.
Table 5-3.
Oscillator
-hp- Model 651A
Frequency Output
1 kc 1. 0 v
50 kc 1. 0 v
500 kc 1. 0 v
10 cps 1. 0 v
1 kc
0. 1 v
50 kc 0. 1 v
500 kc
0. 1 v
10 cps 0. 1 v
$j;
465A
AMPLIFIER

Distortion Check

h. Rotate FUNCTION switch to DISTORTION.
Null out fundamental of signal by alternately
reducing METER RANGE and adjusting
BALANCE and frequency control knob for
null.
j. Final null will indicate amount of distortion
(%) present in Model 465A output signal.
kc, distortion should be less than 1%.
k. Repeat the above test for oscillator fre.;
quencies listed in Table 5-3.
should be repeated with Model 465A GAIN set
to 40 db. Refer to Table 5-3 for oscillator fre­
quencies and distortion tolerances.
frequency response test set SET LEVEL to
insure constant oscillator output amplitude.
Distortion Check
Distortion Analyzer
-hp- Model 331A
Frequency Maximum Disposition
1 kc
50 kc
500 kc
10 cps
1 kc
50 kc
500 kc
10 cps
Section V
Figure 5-2 and Table 5-3
@
DISTORTI ON ANALYZER
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331A
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0
\
@
@
0-
At 1
Entire test
Monitor
1%
1%
2%
1%
1%
1%
2%
1%
.
5-3