Maintenance; Contents; Performance Checks; Adjustments - HP 4328A Operating And Service Manual

Model 4328A Section
V
Paragraphs 5-1 to 5-10
SECTION V
MAINTENANCE
5-1. INTRODUCTION
5-2. This section outlines routme maintenance,
performance checks, adjustments, calibratLon and
troubleshooting for the 4328A Milliohmmeter. Per-
formance checks may be used on incoming inspection
to verlfy instrument specifications.. The performance
checks should also be used alter any adJustments have
been made . .
5-3, CONTENT
5-4. PERFORMANCE CHECKS
5-5. The performance check procedures will ver1fy
Milliohmmeter performance during incoming inspec-
tion, periodtc evaluation, calibration and trouble-
shooting. The tests can be performed without requir-
ing removal of the access instrument case. Specifica-
tions in Table 1-1 are the performance standards.
Should the Milliohmmeter fails to meet any of the
per[ormance test specifications, refer to the trouble-
shooting diagrams.
5-6. ADJUSTMENTS
5-7.. The adjustment procedures describe the adJust-
ments necessary to calibrate the Milliohmmeter.
AdJust the Model 4328A only when
it
is determined
that the instrument is actually out of adjustment, and
not malfunctioning due to a circuit failure . .
5-8. Several circuit components are factory-selected
to meet specific c trcuit requirements.. The factory
selected parts are indicated on the schematic dia-
grams . .
5-9. TEST EQUIPMENT
5-10. [nstruments and accessories required for
adjusting and testing the 4328A are listed and briefly
described in Table 5-1. Instruments used to check
4328A performance must meet or exceed the spectft-
cations given . .
Table 5-1. Recommended Test Eqmpment.
lnstrument Type Required Characteristics
Use Recommended Model
0. 001 to 100 ohms Full scale checks
YEW Type 2782 or YEW
Standard Reslstor
Accuracy ~ ±0.1% and calibration
Type 2792 and GR-1433-U
Decade resistor
Decade Range: 10 to 100 ohms
Tracking checks & YEW Type 2786 or
Reststance Box Accuracy: ±0.1%
calibration at lOOn GR Model 1432T
range
Decade Resistance Box
Ohm Meter
Range: 1n
Troubleshooting HP Model 412A
Accuracy: ±5%
Digttal Range::
O.lV
Troubleshooting
HP Model 3440A
Voltmeter Accuracy: ±0.2%
DC Voltmeter
Range:. 1 - 30V
Checks
HP Model 412A
Accuracy: ±1%
100/lV· em
Checks and
HP Model l80A
Oscilloscope
Vert. Sens.
Vert. Plug-in
Sweep time 0. 5 ms. "em
Troubleshooting
Model 1806A
5-1