Tek Test: 93 - Tektronix VM700T User Manual

VM700T Option 40/41/42 Audio Measurements User Manual

TEK TEST: 93

Insertion Measures input audio signal level and compares it with the
Gain Error
correct signal value.
Sweep Max.
Measures the difference between actual and expected gain.
Gain
Sweep
Makes a frequency sweep, and displays maximum or minimum
Min. Gain
deviations.
NOTE. If either the Sweep Max gain or the Sweep Min gain exception limits are
exceeded, both will be flagged with a double ** and the message "Limits
Exceeded" appears in the View Audio Auto Test Screen display. The values
displayed will be the max. and min. sweep gain values, but they may not be the
limits that were exceeded during the sweep. The amplitude and frequency
exceptions are displayed graphically in other View Audio Auto Test screens. The
logging information sent to the serial port also includes the actual value and
frequencies of all limit exceptions that occur during the tests.
Polarity
Checks the polarity of the polarity portion of the test signal to
determine if the signal is normal or reversed.
Stereo Channel Checks for Normal or Swapped, depending on which channel
Assignment
receives the test sequence preamble. The left channel normally
receives the test sequence preamble.
SNR (weighted)
Measures the CCIR quasi-peak weighted signal-to-noise ratio.
(dB)
Max. THD+N
Measures the maximum total harmonic distortion plus noise (in
during tone
percent) during the THD at TEST Level sweep portion of the
sweep
test sequence.
Max. THD + N
Measures the maximum total harmonic distortion plus noise (in
(at TEST
percent) during the THD at TEST Level + 10 dB sweep portion
+10 dB)
of the test sequence.
Max. THD + N
Measures the maximum total harmonic distortion plus noise (in
(at TEST
percent) during the THD at TEST Level + 15 dB sweep portion
+15 dB)
of the test sequence.
Max. Crosstalk
Measures the maximum channel-to-channel crosstalk (in dB)
during sweep
during the crosstalk portion of the test sequence.
Operating Basics
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