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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_meas_dapower_desc.fm
Digital Average Power Measurement Description
Digital Average Power Measurement Description
How is a Digital Average Power measurement made?
Digital average power measurements are broadband power measurements made on the RF input before
frequency downconversion (see “Block Diagram” ). Digital average power measurements return the true rms
power level of the input signal. Triggering is handled by internal mechanisms and autoranging is used. No
external triggering is available.
The input waveform is detected by a peak detector with sufficient AM bandwidth to track the instantaneous
power changes of a CDMA signal. Each measurement is made by analyzing a 10 millisecond period (one-half of
a frame) of the detected waveform.
The test set’s digital signal processor (DSP) determines the true rms value of the signal. If the input signal is
power-gated, only the active power control groups will be measured.
This measurement uses autoranging based on the open loop power control response of the mobile station to set
up the receiver signal path attenuation.
Digital Average Power measurement characteristics
The digital average power measurement has greater than 2 GHZ bandwidth. For this reason, significant
signal energy outside the IS-2000 SR1 (1.25 MHz) signal bandwidth will increase the measured value.
This measurement can be made on signals that are power-gated or signals that are not power-gated. It is not
necessary to specify whether the input signal is power-gated.
Input Signal Requirements
The digital average power measurement meets or exceeds specifications when the following requirements are
met:
• The frequency of the signal being measured must be in the range of 412 MHz to 483 MHz, 800 MHz to 960
MHz, or 1.7 GHz to 2.0 GHz.
• The signal level into the test set’s RF IN/OUT connector must be between +37 dBm and -30 dBm. The test
set can autorange to a signal that is between +8 dBm to -20 dBm of the expected level (see
“RFANalyzer:AUTO:POWer[:SELected]?” ).
Related Topics
“READ? Subsystem”
“SETup:DAPower”
“INITiate”
“FETCh:DAPower”
“Channel Power Measurement Description”
“Test Adherence to Standards”
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