5
Audio Analyzer Measurement Functions
126
Keysight U8903A User’s Guide
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
Summary of Contents for U8903A
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