HP 3400B, User'S And Service Manual

Page: 32 / 77

Chapter 2 Calibration Procedures
Adjustment Proced ures
HP 3400B Calibrator Calibrator
Range Output Voltage Output Frequency
0.01 V om V 1
kHz
1 HP 34008:
Select the 0.01 vol t range.
DC Output
(DMM Readng)
-1.0019V
to
-0.9981 V
2
Calibrator: Select a 0.01 volt ac signal at 1 kHz (use the
"Wideband" outpu t on the Fluke
5700A).
3
External Multimeter: Select the 10 Vdc range with
5�
digits oC
resolu tion.
4
Remove
only
the top cove r from the
HP 34008
(it is important
that you
do rwt
remove the side or bottom cove rs). Adju st
R32l
until the dc voltage measured at the rea r-panel dc output jack is
within the limits shown in the table above.
Tenth Scale Gain Adjustm.ent
This procedures manually adju sts the voltmeter Cor ten th scale
readings. The tenth sca le adjustment and the Cul l scale adjustment
(described in the previous section)
are
interdependent and you should
repeat the adjustments until both measurements
are
within the
recommended limits.
•
•
•
•
•
The signal measured Cor this test i s a dc voltage taken at the rea r-panel
•
dc output jack. This voltage is normalized to -1 Vdc and i s proportional
to the
RMS
input volt age (-1 Vdc corresponds to a Cull-scale meter
deflection ).
For this adjustment, all measuremen ts
are
made on the 0.01 volt range
•
a t 1
kHz.
You
will
make the ten th scale adjustments u sing
R3l6
which
i s located on the main circuit boa rd
(see
next page).
•
•
30