126
Chapter 4
Making Measurements
Making the Power vs. Time Measurement
Making the Power vs. Time Measurement
Purpose
This measurement is provided for instrument internal testing and self
diagnostics.
Power vs. Time measures the mean transmit power during the “useful
part” of GSM bursts and verifies that the power ramp fits the within
the defined mask. Power vs. Time also lets you view the rise, fall, and
“useful part” of the GSM burst.
Measurement Method
The instrument acquires a GSM signal in the time domain. The “T0”
point and the useful part are computed. If Burst Sync is set to
Training
Seq
, a GSM demodulation is performed to find “T0”. If Burst Sync is set
to
RF Amptd
, an approximation of “T0” will be used without performing
a demodulation. The average power in the useful part is then computed
and displayed, and the GSM limit mask is applied. The measurement
displays
Pass
when the burst fits within the bounds of the mask.
Making the Measurement
NOTE
The factory default settings provide a good starting point. For special
requirements, you may need to change some of the settings. Press
Meas
Setup
,
More (1 of 2)
,
Restore Meas Defaults
at any time to return all
parameters for the current measurement to their default settings.
Select the desired center frequency.
Press
Measure
, Pwr vs Time to immediately make Power vs. Time the
active measurement.
To change any of the measurement parameters from the factory default
values, refer to the
“Changing the Measurement Setup”
section for this
measurement.
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