ETS-Lindgren HI-2790B Calibration Comparison System - Manual (Page 24)

24 Operation www.ets-lindgren.com
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.