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Day comparison requirements – ETS-Lindgren HI-2790B Calibration Comparison System User Manual

Page 24

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24

Operation

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30-Day Comparison Requirements

4.6.1

No value of the MEAN reading of any instrument may be lower

than 90% of the highest reading observed over a 12-month period

between annual calibrations of the HI-1710 LCR. Any time the

MEAN reading or ELLIPTICITY reading is outside the specified

limits, that instrument must be rejected. It should be returned to

the original manufacturer for repair and/or recalibration. Never

attempt to adjust the calibration of an instrument. See Calibration

Comparison Log 30-Day Check on page 25 for suggested log,

examples, and forms usage instructions.

4.6.2

No two acceptable instruments shall yield readings that differ by

more than 2 dB, including polarization extremes. See Calibration

Comparison Log 2 dB Limitation Check on page 29 for log forms

and suggested procedure. A separate 2 dB band may be used for

all instruments checked on a given HI-2790B system.