Model 8901B Adjustments
8.
Set A5R2 (RECT
OFS)
fully cw then slowly ccw until the display reads between 0.0004 and
0.0006.
9. Set the audio oscillator for 2
kHz
at
1
Vms.
Connect
its
output
to
A2J2 (FM
IN)
of
the
10. On the Modulation Analyzer, press FM. Key in 49.0
S
(shift)
0
SPCL
to
connect the output from
11.
Adjust the audio oscillator level until the external voltmeter reads between +1.999
and
+2.001 Vdc.
12.
Adjust A5R73 (VM SENS)
for
a
display on the Modulation Analyzer between 199.9
and
200.1, or
if
the level
has
drifted slightly, until the
four
digits
of
the display agree with the first
four
digits
of
the voltmeter reading
to
within
fl
digit.
13. On the Modulation Analyzer, key in 49.09 spcl.
14.
Adjust A5R23 (AVG SENS) for
a
display on the Modulation Analyzer between 141.3 and 141.5,
or
if
the level
has
drifted
slightly, until the
four
digits
of
the display equals the voltmeter reading
to
within
fl
digit.
15. On the Modulation Analyzer, press PEAK+. Note the display. Press PEAK-. The two readings
of
the display should
agree
to
within
fl
digit.
16. Perform
Adjustment
10
-
FM
Sensitivity, Adjustment
13
-
@M
Sensitivity,
and
Adjustment
15
-
AM
Sensitivity.
Modulation Analyzer
as
shown in Figure 5-3.
the audio peak detector
to
the RECORDER OUTPUT.
rev.15A
UG88
Adjustment
6
5-13
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