HP 3400B, User'S And Service Manual

Page: 35 / 77

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Chapter 2 Calibration Procedures
Adjustment Procedures
20 MHz Flatness Adjustment
This procedure manually adjusts the
20
MHz flatness.
The
adjustment
is made with a 100 m V signal applied at
20
MHz. You
will
make the
flatness adjustment using C304 which is located on the main circuit
board
(see
below).
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).
HP3400B
Range
=:=! :::::::
20 MHz
Flatness
�stm8nt (C304)
::::::: -c:=
Calibrator
Calibrator
Oulpu! Voltage Output Frequency
DCOutpu!
(DMM Reeding)
0. 1 V 0. 1
V 20 MHz -1 .0 125 V to -0. 9875 V
t HP 3400B: Select the
0. 1
volt range.
2 Calibrator: Select a
0. 1
volt ac signal at
20
MHz (use the
"Wideband" output on the Fluke 5700A).
3
External Multimeter: Select the
10
Vdc range with 51.<.! digits of
resolution.
4 Remove only the right-side cover from the HP 3400B (as viewed
from the front panel). It is important that you do IWt remove the
left-side. toP. or bottom covers. Adjust C304 until the voltage
measured at the rear-panel dc output jack is within the limits
shown in the table above.
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