Basic Measurements
1760 SeriesComponent Waveform/Vector Monitor User Manu al 4-23
Time Code Display
Linear Time Code, also known as Longitudinal Time Code
(LTC),is an 80-bit signal with information whichmakes it
possible to accurately identify an indivi dual frame of re-
corded video. LTCi st ypically recorded on an unused audio
track. The 1760--Seriesmonitor provide s a voltage-versus-
time display ofthe Time Code waveform, which can be used
to check for the following problems:
HNo signal.
HSync word in the wrong position (imp roper
Time Code-to-Videosync).
HLow amplitude or noisy timecode signal.
To display the Time Code signal on the monitor, connect the
video signal containing LTC to the rear-panel REMOTE
connector as follows: pin 12 (+ input), pin 13 (--input), and
pin 14 (ground). Push the front-panel TIME CODE button.
The display should be a stable square wave.
Sync Word
The trigger point is FIELD 1 of the applied video wave-
form—either internal or externalreference. When synchro-
nized to video, the display is stable. The sync word should
appear on the right. If it is missing, drifting, or in another
position, there is a problem with the Time Code-to-Video
synchronization.
Amplitude
Time code gainis set from the GAIN MENU when TIME CODE
display is selected. Gain choices are 0 dBu, 4 dBu, 8 dBu, or
12 dBu. Select gain relative to the system under test. If the
waveformmonitor display amplitude is much less than would
be expected for the given input, a problem mayexist wit h the
Time Code level.