HP 3400B, User'S And Service Manual

Page: 31 / 77

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Chapter 2 Calibration Procedures
Adj ustment Proced ures
Full Scale Gain Adjustment
This procedure manually adjusts the voltmeter for full scale readings.
The full scale adjustment and the tenth scale adjustment (described in
the next section)
are
interdependent and you should repeat the
adjustments until both measurements
are
within the recommended
limits.
The signal measured for this test is a dc voltage taken at the rear-panel
dc output jack. This voltage is normalized to -1 Vdc and is proportional
to
the
RMS
input voltage (-1 Vdc corresponds
to
a full· scale meter
deflection).
For this adjustment, all measurements
are
made on the 0.01 volt range
at
1 kHz.
You
will
make the full scale adjustments using
R321
which is
located on the main circuit board
(see
below).
Full
Scale
r
Gain Adjustmont (R321)
c:
-0- r=J -C)-
-0- -= -C)-
-=
�C
-(')- -()-
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