102 U8903A User’s Guide
5Audio Analyzer Measurement Functions
To make an interchannel phase measurement, the signal level
must be specified. Phase measurements are generally not
level- sensitive, as long as the signal is well above the noise
and below distortion.
For example, to test the interchannel phase delay of a stereo
system, we inject a 1 Vrms, 1 kHz sine waveform using the
same generator channel. The output of one channel is
connected to the analyzer channel 1 while the other is
connected to channel 2. Set the analyzer to measure phase.
If channel 1 is set as the reference channel, the channel 2
result is the interchannel phase delay.
A phase response measurement compares the phase of the
output signal of a UUT to the phase of the signal at its
input. A simple way to make this measurement is to use the
analyzer channel 1 to measure the input, and the analyzer
channel 2 to measure the output.
The U8903A always uses channel 1 of the generator as the
reference channel, while the selected analyzer channel
becomes the reference channel for interchannel phase
measurements.
The following figure shows the phase measurement with
reference to channel 1.
Figure 5-14 Phase measurement
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