27
OPERATING INSTRUCTIONS (CONT.)
2.
Connect another cable from the
COMP SYNC
output
jack to the external trigger input of the oscilloscope.
3.
Select the external triggering mode on the oscilloscope.
4.
A sweep rate of about 10µs/div is appropriate for
viewing horizontal tines of composite video, 2 ms/div
for viewing vertical fields, and 5 ms/div for viewing
vertical frames. The sweep vernier may be used for tine
adjustment of the waveform display.
SIMULTANEOUS OUTPUTS
For maximum flexibility, all output jacks may be used
simultaneously if desired. This can be a valuable aid in many
applications. These outputs are summarized as follows:
The
COMPOSITE VIDEO
output is continuously
available when the instrument is operating. The video
component of the signal is dependent upon the selected
pattern.
The
IF/RF
output is continuously available when the
instrument is operating. It may be set to operate on
channel 3, channel 4, or i-f frequencies. It is modulated
by the same signal that appears at the
COMPOSITE
VIDEO
output jack (however. level is fixed and sync
pulse is negative going), although the modulated 4.5MHz
subcarrier can be added.
The
COMP SYNC, Vs,
Hs,
and
30 Hz
are also
continuously available. The
COMP SYNC
output
supplies negative polarity sync, and the
Vs
and
Hs
sync
outputs supply positive polarity signals. The
30Hz
signals is a TTL level square wave useful for video
recorder troubleshooting.
Summary of Contents for 1249B
Page 1: ...INSTRUCTION MANUAL Model 1249B NTSC GENERATOR ...
Page 16: ...16 THE NTSC COLOR VIDEO SIGNAL CONT Fig 3 Elements of Color Television Signal ...
Page 20: ...20 CONTROLS AND INDICATORS CONT Fig 4 Controls and Indicators ...
Page 35: ...35 MAINTENANCE CONT R7 Fig 8 Adjustment and Test Point Locations ...
