ETI PI-800-GEN2 Instruction Manual page 44

Electrical Test Instruments PI-800 GEN2 and PI-1600 GEN2
SECTION V
SERVICE INFORMATION AND DOCUMENTATION
MAINTENANCE AND CALIBRATION OF THE PI-800 GEN2 and PI-1600 GEN2
The PI-800 GEN2 and PI-1600 GEN2 require only minimal maintenance.
Mechanical components such as latches may need periodic lubrication.
External surfaces should be kept clean, and screws on access panels should be
checked for tightness. The output connectors must be kept clean and smooth,
and bolts should be replaced if not 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,
place the unit face down on a protective pad on panel handles, and remove the
rear cover. Flip unit over with output connectors down. Remove the eight
screws on the front panel, and carefully pull the entire unit up and out of the
enclosure. 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. Dust in the front panel screen should be blown out from
inside with compressed air.
Vernier brushes should be inspected for signs of wear or overheating and
cleaned or replaced as required.
Calibration of the PI-800 GEN2 and PI-1600 GEN2 requires accurate current
measurement in both series and parallel connection. Adjustment may be
accomplished by means of the potentiometers accessible through the chassis
when the rear panel is removed. The pots correspond to the connection modes
marked on the switch.
MAINTENANCE AND CALIBRATION OF THE MAC-21
The MAC-21 is manufactured using solid state components that should not re-
quire 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 af-
fect 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
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