View Audio Auto Test - Tektronix VM700T User Manual

Operating Basics

View Audio Auto Test

2–14
Harmonics
of 60 Hz
cies for display. These selection and the Harmonics of 50 Hz
choice can help you locate power source frequency contamina-
tion.
Set Input
Range
most closely matches the amplitude range of the input signal.
The VM700T digitizes an audio signal measured in a selectable
92 dB window over a total range of 132 dB.
The input ranges of the left and right channels may be
configured independently with the
the best range for the applied signal level.
NOTE. Use care when selecting AUTO for setting the input range. If varying
signals, such as voice, are applied to the Audio option, the attenuators
constantly switch ranges as they attempt to select an appropriate measurement
window for a constantly varying input signal.
View
View Spectrum toggles the display back to the View Spectrum
Spectrum
application
The View Audio Auto Test measurement detects, captures, and displays
Tek/ANSI and CCITT Recommendation O.33 automatic audio measurements on
the currently selected audio channel. Test signals applied must adhere to these
quoted standards to be used by the option for valid measurements.
NOTE. The Audio option processor circuitry runs independently of the VM700T
video sections. This means that audio measurements may be captured for later
display even while video capture and display operations are in progress.
However, when the VM700T is running an Audio option application, it cannot
simultaneously monitor the automatic test sequences.
Similar to the Audio Analyzer display, the View Audio Auto Test measurement
lets you capture an extremely detailed view of the automatic audio measure-
ments. The information shown on the display varies with the type of test being
received.
VM700T Option 40/41/42 Audio Measurements User Manual
selects the 60 Hz fundamental frequen-
enables you to select the range window that
soft keys. In Auto, the range window is adjusted to find
or