HP 8924C Reference Manual page 179

Operating Considerations for the Average Power Measurement
The Test Set compensates for internal amplitude offsets by zeroing the power meter
the field is selected. Average power measurements should be zeroed at least
Zero
as often as the following conditions arise:
• 5 °C change in operating temperature
• Power cycle
• Daily
Average Power measurements are made using a factory-calibrated power detector.
If the Test Set is configured for PCS band operation, the detector is located in the
HP 83236 PCS Interface. Otherwise, the detector is located in the Test Set.
The detector measures power during the time that power control groups are gated
on. Each Average Power measurement is computed from data taken during a 10
ms (one-half of one traffic frame) sampling period, ensuring that at least one out
of the eight available power control groups in the half-frame will be gated on,
even if the transmit data rate is 1200 bps.
For example, if the data rate is 9600 bps (full-rate) average power will be
measured during all eight available power control groups. If the data rate is 1200
bps, Average Power will be measured during only one power control group. (The
Test Set is able to determine the pseudo-random positioning of the power control
groups that are gated on). The benefit of this measurement process is that
measurement results will be consistent across all possible transmit data rates.
Use the "TRIG" command to trigger Average Power measurements when using
single trigger mode. (The command "TRIG:AST 'Arm'" will not trigger Average
Power measurements).
See Also
"Chan Power" on page 197
"Zeroing Average Power Measurements"
of the HP 8924C Application Guide
Screens Where Field is Present
CDMA CALL CONTROL
CDMA TRANSMITER POWER RANGE TEST
CDMA CELLULAR MOBILE TRANSMITTER TEST
S:\hp8924c\REFGUIDE\MANUAL\fields.chp
Chapter 4, Description of Fields
Fields That Begin with the Letter A
in the Calibrating the Test Set chapter
when
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