92 Chapter3
Making EDGE (with GSM) Measurements
Making the Waveform (Time Domain) Measurement
Making the Waveform (Time Domain)
Measurement
NOTE This Waveform measurement section is used in the following
personalities: Basic, cdmaOne, GSM, NADC, PDC, iDEN, cdma2000,
W-CDMA (3GPP), W-CDMA (Trial & Arib).
Purpose
The waveform measurement is a generic measurement for viewing
waveforms in the time domain. This measurement is how the
instrument performs the zero span functionality found in traditional
spectrum analyzers. Also available under basic mode waveform
measurements is an I/Q window, which shows the I and Q signal in
parameters of voltage and time. The advantage of having an I/Q view
available while in the waveform measurement is that it allows you to
view complex components of the same signal without changing settings
or measurements.
The waveform measurement can be used to perform general purpose
power measurements to a high degree of accuracy.
Measurement Method
The transmitter tester makes repeated power measurements at a set
frequency, similar to the way a swept-tuned spectrum analyzer makes
zero span measurements. The input analog signal is converted to a
digital signal, which then is processed into a representation of a
waveform measurement. The transmitter tester relies on a high rates of
sampling to create an accurate representation of a time domain signal.
Making the Measurement
NOTE The factory default parameters provide a good starting point.You will
likely want 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.
Press
Measure, Waveform (Time Domain) to immediately make
Waveform (Time Domain) 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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