Tv Trigger Exercise; Instrument Setup; Oscilloscope Setup - HP 54501A Operation Reference

TV
Trigger
Exercise

Instrument Setup

Oscilloscope Setup

Video signals are unique, and as such have unique requirements for
This
proper triggering.
with video signals on the HP
Use a standard NTSC signal generator with clamped video output for this
exercise. Tum color bars on.
Connect the NTSC video signal to channel 1 of the HP
•
Press AUTOSCALE.
•
IV
Select the trigger mode.
Hz/525 lines and channel
• 60
Set
You must determine the polarity of the sync pulse.
Select the trigger level and rotate the knob until a stable display
•
attained. When you are able to see a sync pulse and
the polarity, selectpolarity (press the selection key) and
pulse in accordance with .the actual pulse.
•
Set the trigger level at approximately the midpoint of the sync pulse.
This
sets the trigger level just below the middle of the sync pulse and tells
the oscilloscope to trigger on the leading edge.
•
Set trig'd/au / o to trig'd.
This eliminates the possibility of a premature trigger event
•
Select field 1 and
•
Press TIMEBASE and set time/division to
exercise demonstrates how to display and work
5450lA.
as the source.
1
line 1.
5450lA.
can
determine
set
the sync
occ .
ur ring
100 fLS/div.
Trigger Menu
is
&-29