3 Spectrum Analyzer Mode
3.13 Phase and Amplitude vs Time Measurement
3.13 Phase and Amplitude vs Time Measurement
This measurement performs narrow band long capture; phase and amplitude
variation over the capture is computed.
The steps involved in the PAvT measurement include:
1 Instrument Setup You configure the measurement for Center Frequency, Triggering,
and Amplitude. Adjust the Amplitude Reference level, Range, or
Adjust Range for Min Clipping as appropriate for the transmitted
signal. Once the amplitude settings are obtained, ensure that the
transmitted signal remains within the dynamic range of the
instrument for proper measurement to be performed
2 Determine
Frequency Error
Provide the Frequency Error, or perform a measurement of Frequency
Error. The Frequency Error measurement is at narrow band with a
specific sample rate. When the measurement is run, the transmitted
signal must not change in frequency
3 Actual
measurement
This is a long capture of the transmitted signal as the phase and
amplitude of the signal changes. The power and phase for the entire
captured signal will be calculated from the measured data and
Frequency Error
Based on the Phase and Power calculated, additional manipulation on the data
occurs to reduce the result to the request number of segments and to make the
results relative to the first segment.
The first segment is called the Relative Baseline; the absolute values of the first
segment are stored into the Relative Baseline result and then normalized to obtain
0° phase and 0 dB reference.
Measurement Operation
The 1st segment (the Relative Baseline) is initiated when the Trigger conditions are
met, and all following segments are computed immediately thereafter based on the
Meas Offset, Meas Interval, and Meas Transient. The measurement time of each
segment is linear progression (segments are equally spaced).
Spectrum Analyzer Mode User's &Programmer's Reference 1947
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