User's Manual Part 2

Test Set Calibration

DRAFT

SC4812ET BTS Optimization/ATP — CDMA LMF

Apr 2001

3-50

Background

Proper test equipment setup ensures that the test equipment and

associated test cables do not introduce measurement errors, and that

measurements are correct.

If the test set being used to interface with the BTS has been

calibrated and maintained as a set, this procedure does not

need to be performed. (Test Set includes LMF terminal,

communications test set, additional test equipment,

associated test cables, and adapters.)

NOTE

This procedure must be performed prior to beginning the optimization.

Verify all test equipment (including all associated test cables and

adapters actually used to interface all test equipment 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, re-calibration must be performed. Failure to do so

can introduce measurement errors, resulting in incorrect

measurements and 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. Calibrate the test equipment

after it has been allowed to warm–up and stabilize for a

minimum of 60 minutes.

IMPORTANT

Purpose

These procedures access the CDMA LMF automated calibration routine

used to determine the path losses of the supported communications

analyzer, power meter, associated test cables, and (if used) antenna

switch that make up the overall calibrated test set. After calibration, the

gain/loss offset values are stored in a test measurement offset file on the

CDMA LMF.