HP 8901B Operation And Calibration Manual page 363

Model
8901B
Performance
T e s t s
0
W D U L A T I O N
OUTPUT/
LOW
AUDIO
INPUT
OUTPUT OUTPUT
AUDIO
ANALYZER
; ; : ; ;
000000
0000 0
n i w
0 0
:
8 : : :
0
OUTPUT
a 0 0
000000 0
0000
0
Distortion Accuracy
16. On the audio analyzer,
set its
output float switch
to
the float position. Set the audio analyzer's
oscillator
to 1 kHz
at 1V.
17. Set the audio synthesizer
to
2
kHz
at
a level as low as possible without switching the instrument
off (but less than
-50
B m ) . Connect the audio analyzer and audio synthesizer as shown in
Figure
4-5.
Note
that
the audio synthesizer
is
connected
to
the floating low output of the audio
analyzer's output.
(This
has the effect of summing the two outputs.)
AUDIO
SYNTHESIZER
HP 89018
MODULATION
ANALYZER
-~
~
Distortion Limits (%)
Audio
Synthesizer
Frequency
(kHz) Lower Actual
Upper
0.89
0.89
0.89
0.89
I
Figure
4-6.
Distortion Accuracy Performance Test Setup
-
1.12
-
1.12
-
1.12
-
1.12
18. On the Modulation Analyzer, key in
30.0
SPCL
to
set the Modulation Analyzer to measure
external audio rms level. (Note
that
the display reads approximately 1V.) Now set RATIO to on.
19. Set the audio analyzer's oscillator level to
OV
or a level as low as possible without switching the
instrument
off
(but at most 10 mV).
20. Increase the audio synthesizer's level until the Modulation Analyzer's display reads between 99
and 101%.
21. Switch the audio synthesizer's level down exactly
40
dl3. Set the audio analyzer's oscillator level
back
to
1V.
22. On the Modulation Analyzer, press S (shift) then AUDIO DISTN.
23.
Set the audio synthesizer's frequency as shown in the following table without changing the audio
synthesizer's amplitude. For each setting, the Modulation Analyzer's display should read between
the limits indicated in the table.
24. Set the audio analyzer's oscillator frequency to
400
H z
without changing its level.
25. On the Modulation Analyzer, press the blue key then press 400
H z DISTN.
rev. 15AUG88
Performance Test 5
4-23