Tektronix 1760 User Manual
Basic Measurements
1760 Series Component Waveform/Vector Monitor User Manual
4-23
Time Code Display
Linear Time Code, also known as Longitudinal Time Code
(LTC), is an 80-bit signal with information which makes it
possible to accurately identify an individual frame of re-
corded video. LTC is typically recorded on an unused audio
track. The 1760--Series monitor provides a voltage-versus-
time display of the Time Code waveform, which can be used
to check for the following problems:
(LTC), is an 80-bit signal with information which makes it
possible to accurately identify an individual frame of re-
corded video. LTC is typically recorded on an unused audio
track. The 1760--Series monitor provides a voltage-versus-
time display of the Time Code waveform, which can be used
to check for the following problems:
H No signal.
H Sync word in the wrong position (improper
H Sync word in the wrong position (improper
Time Code-to-Video sync).
H Low amplitude or noisy time code 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
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 external reference. 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.
form—either internal or external reference. 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 gain is 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
waveform monitor display amplitude is much less than would
be expected for the given input, a problem may exist with the
Time Code level.
12 dBu. Select gain relative to the system under test. If the
waveform monitor display amplitude is much less than would
be expected for the given input, a problem may exist with the
Time Code level.