Electrical Test Instruments PI-6000
Section V - Service Information and Documentation
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Copyright(C) 1994-2004 Electrical Test Instruments, Inc. All Rights Reserved
SECTION V
SERVICE INFORMATION AND DOCUMENTATION
MAINTENANCE AND CALIBRATION OF THE PI-6000
The PI-6000 requires only minimal maintenance. Mechanical components such
as casters and hinges may need periodic lubrication. External surfaces should
be kept clean, and screws on access panels should be checked for tightness.
The output stab adapter plates must be kept clean and smooth, and studs
should be maintained in good condition. Poor output connections are the main
cause of overheating and poor performance.
Occasionally, or more often if used in dusty environments, it is important to
inspect and clean interior components. Disconnect from all sources of power
and remove all access covers. Carefully blow out any dust and inspect all
connections for tightness and any sign of deterioration due to corrosion or
overheating.
The fans should be cleaned with a damp rag and checked for signs of bearing
wear by spinning.
Rheostat brushes should be inspected for signs of wear or overheating and
cleaned or replaced as required.
Calibration of the PI-6000 requires accurate current measurement in both series
and parallel connection. Adjustment may be accomplished by means of the
potentiometers accessible through the output stab plate. The outer pot is for
parallel connection, and the inner pot is for series.
MAINTENANCE AND CALIBRATION OF THE MAC-21
The MAC-21 is manufactured using solid state components that should not
require extensive maintenance. However, the accuracy of the MAC-21 is critical
to the testing of circuit breakers and is dependent upon the output of an air-
core current sensing coil, which could change due to movement caused by
shock or vibration encountered in transporting the test set. Other factors which
may affect calibration are contact resistance in the control cable, unusual
magnetic fields, insulation leakage, and aging of electronic components in the
MAC-21. Therefore, proper operation and calibration should be checked at
regular intervals and adjusted if proper equipment is available. The
manufacturer’s recommended calibration inte
rval is (1) one year.
