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Chapter 4, Description of Fields
Fields
The following list describes the purpose for each Agilent Technologies E8285A
power measurement. For more detail, refer to the field description for the power
measurement you choose.
•Avg Power
Avg Power (Average Power) displays the average power measured from all
demodulated “on” power control groups transmitted by the mobile station under test.
The specified amplitude range of this measurement is from -10 dBm to +40 dBm. This
measurement is more accurate than the Chan Power measurement.
•
Chan Power
Chan Power (Channel Power) displays lower level RF power by analyzing the
downconverted IF at the Test Set’s DSP analyzer’s input. The amplitude range of this
measurement is from -50 dBm to +35 dBm. This measurement is limited to a 1.23
MHz bandwidth.
•
Acc Prb Pwr
Acc Prb Pwr (Access Probe Power) displays access probes from the mobile station
by automatically triggering a power measurement each time the mobile station
registers, performs a mobile station originated call, or performs a mobile station
terminated call. (Access Probe Power will also be displayed when SMS (Short
Message Service) or Authentication procedures are attempted on the Paging channel.
GPIB Examples
“DISP CTXT;CDMA:TX:POW:MEAS ‘Avg Power’”
selects the average power measurement.
“DISP CTXT;MEAS:CDM:AVGP?”
queries the average power measurement.
“DISP CTXT;MEAS:CDM:AVGP:ZERO”
zeroes the average power measurement.
Operating Considerations for the Average Power Measurement
The Test Set compensates for internal amplitude offsets by zeroing the power meter
when
the
Zero field is selected. Average power measurements should be zeroed at least
as often as the following conditions arise:
• 5 °C change in operating temperature
• Power cycle
• Daily