ETS-Lindgren HI-2790B Calibration Comparison System - Manual (Page 19)

www.ets-lindgren.com Operation 19
Establishing a Reference Field
4.1.1 Position the HI-1710 LCR sensing probe in the probe holder with
the rear of the probe head firmly seated against the end of the
holding fixture. Insert the end of the probe handle into the probe
holder and tighten the thumbscrew.
4.1.2 Select the 0 –2 mW/cm 2 range, FAST response (Filter 2), and the
PEAK HOLD selection to OFF (PEAK HOLD LED is not lit).
4.1.3 Turn on the RF switch and adjust the RF LEVEL until
approximately 1.00 mW/cm 2 is displayed on the HI-1710 LCR.
4.1.4 Allow the system to stabilize for ten minutes with the RF switch on.
4.1.5 Rotate the probe in the probe holder, noting the highest reading
and the lowest reading in one full rotation of the probe. Using the
highest and lowest observed readings, rotate the probe to obtain a
reading exactly midway between the high and low reading.
Alternately, a mark can be made on the probe handle to allow
repositioning the probe at the same point for all 30-day
comparisons.
4.1.6 With the probe adjusted or rotated for a mid reading, readjust the
RF LEVEL to obtain an indication on the HI-1710 LCR of
1.00 mW/cm 2.
4.1.7 Make sure the Power/Control Module is displaying RF Power. If
not sure, press the UP and DOWN keys simultaneously to change
the display to the RF Power indication.
4.1.8 Calibrate the HI-2790B Power/Control Module RF Power reading
by pressing and holding the CAL button, and then pressing the UP
or DOWN buttons until the Power/Control display indicates the
same value as the HI-1710 LCR (typically 1.00).
4.1.9 With the RF power on and the HI-1710 LCR indicating 1.00, note
the Power/Control Module in the FWD, REF, and DIF readings and
record in the operational log. Rotate the probe through one
complete revolution and record the highest and the lowest
readings. Check the ZERO condition of the HI-1710 LCR and re-
zero if necessary. The HI-2790B system is now ready to perform
calibration checking.