Installation Instructions

Test Cable Calibration
DEC 2000
7-39
SCt300 BTS Hardware Installation, ATP and FRU Procedures
PRELIMINARY
Background
Proper test equipment setup ensures that all measurements are correct,
and that test equipment and associated test cables do not introduce
measurement errors. Motorola recommends repeating cable calibration
prior to testing at each BTS site.
If not already done so, this procedure needs to be performed prior to
beginning the ATP. Verify that all test equipment (including all
associated test cables and adapters actually used to interface all test
equipment and the BTS together) has been calibrated.
In the event that any piece of test equipment, test cable, or
RF adaptor is replaced that makes up the calibrated test
equipment set, re–calibration should be performed. Failure
to do so can introduce measurement errors, resulting in
incorrect measurements or degradation to system
performance.
CAUTION
Calibration of the communications test set (or equivalent
test equipment) must be performed at the site before
calibrating the overall test set after it has been allowed to
warm–up and stabilize for a minimum of 60 minutes.
IMPORTANT
*
Purpose
This procedure accesses the LMF automated calibration routine used to
determine the path losses of the supported communications analyzer,
power meter, associated test cables, and (if used) RF Network making up
the overall calibrated test set. After calibration, the gain/loss offset
values are stored in a test measurement offset file on the LMF.
If you have obtained the test cable insertion loss values previously, you
can manually enter them using the Util>Edit>CableLoss>TX or RX
menu.
Do not use the manual method if you plan to run/have already run the
cable calibration procedure.
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