Maintenance
INTRODUCTION
6
6-3
WARNING
THESE SERVICE INSTRUCTIONS ARE FOR USE BY QUALIFIED
PERSONNEL ONLY. TO AVOID ELECTRIC SHOCK, DO NOT
PERFORM ANY PROCEDURES IN THIS SECTION UNLESS YOU
ARE QUALIFIED TO DO SO.
6-1. INTRODUCTION
This section presents maintenance information for the 8842A. The section includes a
performance test, a calibration procedure, troubleshooting information, and other general
service information.
Test equipment recommended for the performance test and calibration procedure is listed
in Table 6-1. If the recommended equipment is not available, equipment that meets the
indicated minimum specifications may be substituted.
Table 6-1. Recommended Test Equipment
INSTRUMENT
TYPE
MINIMUM SPECIFICATIONS RECOMMENDED MODEL
PREFERRED:
Voltage Range: 0-1000V dc
Voltage Accuracy: 10 ppm
Absolute Linearity: ±1.0 ppm
Fluke 5700A or Fluke 5440A
ALTERNATIVE:
(Must be used with Kelvin-
Varley Voltage Divider)
Voltage Range: 0-1000V dc
Voltage Accuracy: 20 ppm + 20 ppm
of range
Fluke 720A
DC Calibrator
Kelvin-Varley Voltage Divider:
Ratio Range: 0-1.0
Absolute Linearity: ± 1 ppm of input
at dial setting
Fluke 720A
Resistor Calibrator Resistance Accuracy: 0.0005% Fluke 5700A or Fluke 5450A, ESI
DB62
DC Current Source Accuracy: ±0.025% Fluke 5700A or Fluke 5100B
Oscilloscope General porpose, 60 MHz, with 10
MΩ probe
Philips PM3055 or PM3355
Digital Multimeter Voltage Accuracy
:0.01% in V dc
1.0% for 1V in V ac @ 100 kHz
Input Impedance:
10 MΩ or greater in V dc;
1 MΩ or greater in parallel with <100
pF in V ac
Fluke 8842A (with AC Option –09)
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