Model 8904A Adjustments
Adjustment
3
OUTPUT GAIN (OPTION
006)
Description
The gain of the A6 High Power Output Assembly is adjusted so that the output amplitude
for
a
sinewave
is
correct when the output
is
terminated and open circuit. This adjustment
is
macle after
performing Adjustments
1
and
2.
Equipment
Digital Voltmeter
.................................................................
HP
3478A
Feedthrough Termination, 6000
...................................................
HP 11095A
Procedure
1.
Remove the instrument’s bottom cover.
2.
Connect the Multifunction Synthesizer
OUTPUTS
1
HIGH
output
to
the voltmeter input.
(Do
3.
On the Multifunction Synthesizer, press
SHIFT
PRESET.
After the instrument presets, key in
not use
a
feedthrough termination at-this time.) Switch
LINE
to
ON.
fl
(Channel
Conf
ig.
1
NEXT
SHIFT FLOAT
1
OFF
AMPTD
10
V
4.
On the Multifunction Synthesizer, adjust A6R1 until the voltmeter reads between 19.8 and
20.2
5. Connect
a
600R feedthrough termination
at
the voltmeter’s input.
6.
On the Multifunction Synthesizer, adjust A6R5 until the voltmeter reads between 9.9 and
10.1
vrms.
Vrms.
Adjustment
3
5-7
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