Vm700T Signal Hookup - Tektronix VM700T User Manual

Option 41 and Option 42

VM700T Signal Hookup

2–34
The measurement requires both video and audio test signal connections. Use one,
two, or all three video input channels. The selected channel (A, B, or C) on the
VM700T is the source for the video part of the measurement, but audio signal
selection is not automatic. With Option 40 you must externally switch the correct
audio signal when switching the video measurement source between channels.
With Option 41, you must correctly configure the Source Selection Audio file to
match the video source with the correct audio source. Refer to the previous
Option 41 information and Configuring the Source Selection Audio file on
page 2–29
The audio part of the timing measurement can come in on either the Left or the
Right channel input; the measurement looks at both channels. The first arriving
audio signal provides the audio trigger.
Audio Video Timing Menu
Set Input Range
most closely matches the amplitude range of the input signal.
The VM700T will digitize audio in a 92 dB window within a
total input range of 132 dB. The input ranges of the left and
right channels may be configured independently with the
There are five input range windows:
range A: –62 to +30 dBu
range B: –72 to +20 dBu
range C: –82 to +10 dBu
range D: –92 to 0 dBu
range E: –102 to –10 dBu
Rescale
Vertical Interval
selection is used in a system that places the test signal from the
VITS 200/VITS 201 in the vertical blanking interval.
Active Video
VITS 200 and line 38 for the VITS 201). This selection is used
when working with a CODEC system that does not transmit
signals in the vertical blanking interval.
NOTE. The VITS 200 or VITS 201 must be configured correctly to place the test
signal in the active video.
VM700T Option 40/41/42 Audio Measurements User Manual
enables you to select the range window that
or soft keys.
returns the display scaling to its default values.
triggers the video at line 13. This
triggers in the active video (line 45 for the