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SR1 Operation 271
© 2014 Stanford Research Systems
2.8.10 Interchannel Phase Panel
The Interchannel Phase panel configures a measurement of the phase difference between the A and B
output channels of the EUT. The phase difference can be measured using either a sinewave at a
(sweepable) specific frequency and amplitude or by using the FFT chirp stimulus to provide a complete
measurement of phase difference vs. frequency in a single FFT record.
Cabling Configuration
For analog measurements the A channel of the analog generator should be teed and connected to both
the A and B inputs of the EUT. For digital measurements simply connect the SR1 generator to the EUT
inputs. In both cases the EUT outputs should be connected to the appropriate (analog or digital ) inputs
of SR1.
Generator Configuration
Depending on the selected stimulus waveform the generator is configured with either a sine or FFT chirp
waveform.
Analyzer Configuration
If a sine stimulus is selected the A0 and A1 analyzers are configured as Time Domain Detectors. When
a chirp source is selected the A0 analyzer is configured as a Two-Channel FFT analyzer. The two-
channel FFT analyzer divides the B channel complex FFT spectrum by the A channel spectrum to get
the AB phase vs. frequency response.
Free Run Configuration
For sine stimulus a barchart display is created displaying the interchannel phase at the selected
amplitude and frequency. For chirp stimulus a graph is created showing the instantaneous AB phase
difference as a function of frequency.
Sweep Configuration
A graph is created showing the interchannel phase vs. frequency. If the stimulus is sine, the data is
obtained by sweeping the sine frequency over the specified limits. If chirp is selected the trace
corresponds to a single FFT measurement. In each case, a new trace is created for each point specified