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Chapter 1, Calibrate the Test Set
Average Power Measurement Zeroing
4. Zero the Average Power measurement.
1. Select Zero to zero the Average Power
measurement.
During this process, the message "Zeroing Average Power" will be displayed (for about 2 seconds).
If RF power was not lowered as shown in step 2, the Test Set will display "Zero degraded. Reduce generator
level for best results."
Procedure Overview
NOTE:
30
This procedure establishes a 0 dBm reference for Average Power measurements.
Average Power measurement mode is used on higher-level signals. Lower-level
power measurements are performed by the Test Set's Channel Power
measurement.
A misleading Average Power measurement may appear when low (or no) signal power is
applied to the RF Input! When the RF generator's output port selection is RF IN/OUT,
some of the signal energy from the Test Set's generator is detected by the Test Set's
broadband average power meter. This condition does not affect typical CDMA
measurements for two reasons: 1) During Average Power measurements, CDMA generator
levels are too low to introduce significant energy to the power detector. 2) When the
generator level is high enough to introduce significant energy to the power detector, the
mobile station's signal power should be within the range of Channel Power measurements.
Channel power measurements are frequency-selective, and do not detect significant energy
from the Test Set's generator, which is tuned 45 MHz away from the analyzer.
CDMA CELLULAR MOBILE TRANSMITTER TEST
Avg Power
Power Meas
Zero
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