Keysight U8903A, User Manual, Page: 127 / 167

Audio Analyzer Measurement Functions 5
Keysight U8903A User’s Guide 127
Crosstalk (channel driven and channel measured)
In audio systems with more than one channel, it is common for a signal in one
channel to appear at the output of another channel at a reduced level. Crosstalk
refers to this signal leakage across channels and is expressed in dB (default) or as
a percentage.
Crosstalk is a measurement of the ratio of the signal amplitude in an unused
channel relative to that of a channel driven with a signal. The unused channels
should be grounded, or set to an appropriate bias point. Crosstalk is largely due to
capacitive coupling between the channel conductors in the device and generally
varies with frequency.
There are two modes of crosstalk measurement comprising channel driven and
channel measured. Crosstalk can be computed as follows.
Crosstalk = 20 log
In the channel driven mode, the designated reference channel will be injected
with the stimulus. The presence of this signal in the other channel will be
measured. The crosstalk result of the channel indicates the crosstalk from the
reference channel to that channel. Only one reference channel can be selected at
any one time.
NOTE
The reference channel always displays a value of 0 dB or 100% for all crosstalk
measurements.
rms value of signal measured
rms value of signal driven
-----------------------------------------------
( )