Output Noise Check; Mechanical Meter Zero - HP 3400A Operating And Service Manual

Section V
PULSE GENERATOR
h p 214A
@
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@ @ @
@
v
- -
- @
• • •
"oo.o" .'4�
ThiS corresponds to a crest factor of 10
where:
t-T,
=
E p
C. F.
E pp (l-n)
C. F.
E pp
= .,;---rs- -
C. F.
d. The Model 3400A should indicate 1 volt
(includes the .3% accuracy
e. Adjust pulse generator pulse rate to 250 pps
as indicated on electronic counter.
corresponds to a crest factor of 20.
r.
Model 3400A should indicate
(includes the .3% accuracy
5-14.

OUTPUT NOISE CHECK.

a. Connect 50 ohm leedthru to 3400A INPUT.
5-4
hp3400A
RMS VOLTMETER
v
BANAHA
:�---- -- -- -- -- '$
hpI2�-OO72
Figure 5-4. Crest Factor Test Setup
D =
--­
T 1
where
T 1+ T
2
(l-n)
4%
• •
01
410C).
This
5 volt. <4%
O.
01
410C.)
ELECTRONIC
VOLTMETER
hp410C
@ @
0 0 0 .
ADAPTER
. . �
b. COMect another
c. Set -hp- Model 3400A to
d. The reading on the
exceed 1 mV.
S - l S .
A D JUSTMENT AND CA L I BRATION
PROCEDURES.
5-16. The following is a complete adjustment and
calibration procedure for the Model 3400A.
procedures should be conducted only if it has previously
been established by Performance Checks, Paragraph
5-5 to 5-14. that the Model 3400A Is
Indiscriminate adjustment of the internal controls to
refine settings may actually cause more difficulty.
the procedures outlined do not rectify any maladjust­
ments that may exist, andyouhave carefully rechecked
your connections and settings, refer to Paragraph 5-29,
Troubleshooting Procedures for possible cause and
recommended corrective action.

5-17. MECHANICAL METER ZERO.

5-18. The mechanical meter zero screw is located on
the instrument front panel.
not indicate zero when the instrument power has been
off for at least one minute, mechanically zero the
meter following the procedure outlined below.
Turn instrument power off; disconnect input
a.
Signal and any cable connected to J2 (DC
OUT) at rear of instrument and allow one
minute for meter pointer to stabilize.
b. Rotate zero adjust
of zero, moving up scale.
pointer is at zero.
zero, repeat operation.
Model 3400A
ELECTRONIC COUNTER
hp5233L
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· v e
u
0> •
0
Voltmeter to DC output.
RMS
001 volt range.
O.
Voltmeter should not
RMS
These
out of
adjustment.
H
the meter pointer does
CW
until pointer is to left
Continue until
If
pointer overshoots
H