Model 8904A Adjustments
Audio Amplifier Offset
7.
Connect the voltmeter probes to A3TP4
or
AlOTP4 (output of Audio Amplifier) and to A3TP8
8.
On the Multifunction Synthesizer, key in
or
AlOTP8
(ground). Set the voltmeter to measure dc volts.
For
A3 Output Assembly
For
A10 Output Assembly
WAVE FORM
z
AMPTD
0
V
WAVE FORM
zz
AMPTD
0
V
9. On the Multifunction Synthesizer, adjust A3R229
or
A10R229 (DC
OFFSET1)
for
a
level between
-0.5
and
+OS
mVdc.
Output Amplifier Offset
10.
Connect the Multifunction Synthesizer
OUTPUTS
1
HIGH
output for the A3 Output Assembly,
11.
On the Multifunction Synthesizer, key in
AMPTD
40
mV.
12.
Adjust A3R418 or A10R418 (DC OFFSET) for
a
level between +40.1 and +39.9 mVdc.
or
OUTPUTS
2
HIGH
for
the A10 Output Assembly, to the voltmeter input.
Maximum
DC
13.
On the Multifunction Synthesizer, key in
AMPTD
10
V.
14. On the Multifunction Synthesizer, adjust A3R224
or
A10R224 (DAC
LEVEL)
for
a
level between
+9.99 and +10.01 Vdc.
15. Perform Adjustment 2.
Adjustment
1
5-5
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