ETI PI-6000 Instruction Manual page 47

Electrical Test Instruments PI-6000
Section V - Service Information and Documentation
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Latch Threshold, which should be about 5% of full-scale range.
11. Set the current at 50% of full scale (500 A) and stop the current.
12. Set the MAC-21 to MEMORY mode and press the RESET Switch.
13. Initiate a fast momentary pulse of no more than 6 cycles (0.1 Sec) duration.
The meter should read the same value, within 2%, that was set in step 11
above.
14. Check pulse reading operation in this manner for currents of 200, 400, 600,
and 1000 Amperes, and varying duration.
15. Set Timer Time Base to SECONDS. Press Master Reset Switch. Set N.O.
mode. Using a timing standard, initiate for exactly ninety (90) seconds. Timer
should read 90.00 Seconds, +/- 0.01 Seconds. (Note: actual reading may vary
because of inability to control and measure pulse length.)
16. If everything checks out, the MAC-21 can be assumed to be in calibration,
and no other adjustments are required.
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