HP HP 54600B, User'S And Service Manual

Page: 172 / 183

Composite Video For color, this
consists of blanking, field, and line
synchronizing signals, color synchro-
nizing signals, plus chrominance and
luminance picture information.
These are all combined to form the
complete color video signal.
Equalizing Pulses Pulses of one
half the width of the horizontal sync
pulses which are transmitted at
twice the rate of the horizontal sync
pulses during the portions of the
vertical blanking interval immedi-
ately preceding and following the
vertical sync pulse. These pulses
cause the vertical deflection to start
at the same time in each interval.
They also keep the horizontal sweep
circuits in step during the portions of
the vertical blanking interval
immediately preceding and following
the vertical sync pulse.
Field One of the two (or more)
equal parts of information into which
a frame is divided in
interlace scanning; alternately, one
half of a complete picture (or frame)
interval, containing all of the odd, or
all of the even, lines of the picture.
Field 1 Triggers on the field 1 por-
tion of the video signal.
Field 2 Triggers on the field 2 por-
tion of the video signal.
Frame One complete picture
consisting of two fields of interlaced
scanning lines.
HF Reject (high frequency reject)
Adds a low pass filter with a 3 dB
point at 50 KHz to the trigger path.
Holdoff Keeps the trigger from re-
arming for an amount of time set by
the holdoff knob.
Internal Trigger The oscilloscope
triggers from a channel input that
you choose.
Invert Invert shifts the displayed
waveform 180 degree, and is avail-
able for channels 1 and 2 only.
When the oscilloscope is triggered
on the signal to be inverted, the trig-
ger is also inverted.
IRE An abbreviation for Institute
of Radio Engineers.
IRE Scale An oscilloscope scale
that applies to composite video
levels. There are 140 IRE units in
one volt.
Glossary
Glossary–5