Electrical Test Instruments PI-2500 and PI5000
Section IV - Operating Instructions
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Copyright(C) 1994-2008 Electrical Test Instruments, LLC. All Rights Reserved
Page IV-1
SECTION V
SERVICE INFORMATION AND DOCUMENTATION
MAINTENANCE AND CALIBRATION OF THE PI-2500 and PI-5000
The PI-2500 and PI-5000 require 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 and interconnecting bus connections 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.
Vernier brushes should be inspected for signs of wear or overheating and cleaned or
replaced as required.
Calibration of the PI-2500 and PI-5000 requires accurate current measurement in 1000A,
2000A, and 4000A connections. Adjustment may be accomplished by means of the
potentiometers accessible through the PI-2500 output face plate.
Special Calibration Instructions
The pots on the configuration switch PCB are used to adjust the calibration for 1000A,
2000A, and 4000A modes. They should be set so that the readings are one half or one
fourth the readings in full parallel configuration.
There is a difference in calibration between the PI-2500 and the AUX-5000. Two pots are
provided on the PI2500 control PCB to adjust for this difference. The pot marked AUX
should be used when the AUX5000 is connected, and the pot marked MAIN is used for
just the PI-2500.
The MAC-20 should be calibrated for its standard input value.
