Ch-to-Ch Difference Metrics (Pulse)
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The VSA software supports difference analysis when the hardware configuration contains two or more channels. The pulse measurement uses channel 1 as the “reference”, and all of the VSA pulse measurement results continue to be available for the reference channel. The measurement also automatically does difference analysis between Channel 1 and Channel 2, and three new Ch-to-Ch Differences metrics are made available in the Result Tables, Histograms, and Trend Lines.
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Ch2 Time Diff (sec)
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Ch2 Time Diff in seconds, reports the difference in time between the leading edge of the pulse for Channel 2 and the leading edge of the pulse for the Channel 1 reference. It is calculated as:
TimeDiff = Ch2PulseStartTime−Ch1PulseStartTime
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Ch2 Ampl Diff (dBm deciBels referenced to a milliWatt: dB relative to 1 milliwatt dissipated in the nominal input impedance of the analyzer)
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Ch2 Ampl Diff in dBm, reports the difference in amplitude between Channel 2 and Channel 1. It is calculated as:
AmplDiff = Ch2PulseAmplitude−Ch1PulseAmplitude
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Ch2 Freq Diff (Hz)
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Ch2 Freq Diff in Hz, reports the difference in frequency between the pulse for Channel 2 and the pulse for Channel 1. It is calculated as:
FreqDiff = Ch2PulseFrequency−Ch1PulseFrequency
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Ch-to-Ch Differences metrics are only available if there is more than one input channel.
If the software is unable to find a pulse on Ch2 that lines up with Ch1, the pulse table will show “***” for the Ch2 Time Difference, Amplitude Difference, and Frequency Difference.
If there are extra pulses on Ch2 that don’t appear on Ch1, the extra pulses on Ch2 will be ignored.
Channel 2 pulses are assumed to have the same modulation format as the corresponding Channel 1 pulse.
