HP 54600 Series, User'S And Service Manual

Page: 373 / 387

External Trigger Is available only
on the two channel oscilloscope.
Nonviewable input that is usable as a
trigger source only.
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.
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.
Level Front-panel knob that
changes the trigger level.
LF Reject (low frequency reject)
Adds a high pass filter with a 3 dB
point at 50 KHz to the trigger path.
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.
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.
Normal If a trigger signal is pre-
sent and the trigger conditions are
met, a waveform is displayed. If
there is no trigger signal, the oscillo-
scope does not trigger and the
display is not updated.
Peak Det (peak detect) Allows de-
tection of signal extremes as the
sample rate is decreased in the 5 s to
50 ms/div time base settings.
Polarity Selects either positive or
negative TV sync pulses.
Position Knob that moves the sig-
nal vertically on the display.
Glossary
Glossary–2