User's Manual Part 2

Test Set Calibration

MAY 2004 1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU 6-65

PRELIMINARY

Background

Proper test equipment calibration helps to ensure accurate BTS

optimization and acceptance testing by assuring that the test equipment

and associated cables do not introduce measurement errors.

If the test equipment set being used to optimize or test the

BTS has been calibrated and maintained as a set, this

procedure does not need to be performed.

NOTE

This procedure must be performed prior to beginning the optimization.

Verify all test equipment (including all associated cables and adapters

actually used to interconnect test equipment items and the BTS) has been

calibrated and maintained as a set.

If any piece of test equipment, test cable, or RF adapter

that makes up the calibrated test equipment set has been

replaced, the set must be re-calibrated. Failure to do so can

introduce measurement errors, resulting in incorrect

measurements and degradation to system performance.

Motorola recommends repeating cable calibration before

testing at each BTS site.

CAUTION

Calibration of the communications system analyzer (or

equivalent test equipment) must be performed at the site

before calibrating the overall test equipment set. Calibrate

the test equipment after it has been allowed to warm–up

and stabilize for a a minimum of 60 minutes.

NOTE

Calibration Procedures

Included

Automatic

Procedures included in this section use the WinLMF automated

calibration routine to determine path losses of the supported

communications analyzer, power meter, associated test cables, adapters,

and (if used) antenna switch that make up the overall calibrated test

equipment set. After calibration, the gain/loss offset values are stored in

a test measurement offset file on the WinLMF computer.