Agilent Technologies 54657A Especificaciones Pagina 178

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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.
Line In TV trigger mode, the oscil-
loscope triggers on the TV line sync
pulses. As a trigger source, the oscil-
loscope triggers off of the power line
frequency.
Luminance The amount of light
intensity, which is perceived by the
eye as brightness (referred to as "Y")
Main Sets the oscilloscope to a
volts vs time display that displays
the main time base sweep.
Mode Allows you to select one of
five trigger modes, Auto level, Auto,
Normal, Single, TV.
Noise Rej (noise reject) De-
creases the trigger sensitivity to
reduce the triggering on signal noise.
NTSC National Television
Systems Committee. An industry-
wide engineering group which,
during 1950-1953, developed the
color television specifications now es-
tablished in the United States,
Canada, Japan, and Mexico. A 525
line, 60 Hz field, 4.2 MHz system.
Two frames (4 fields) for picture
completion.
Glossary
Glossary–6
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