Promax OD-405, Manual, Page: 186 / 218

USER’S MANUAL. OD-405/410B/411/415
11-2011 Page 70
Holdoff (OD-411/OD-415) The holdoff function defines the
waiting period before the
oscilloscope starts triggering again
after a trigger point. The Holdoff
function ensures a stable display.
Video standard
(video
trigger) NTSC National Television System
Committee
PAL Phase Alternative by Line
SECAM SEquential Couleur A Mémoire
Sync polarity
(video trigger)
Positive polarity
Negative polarity
Video line
(video
trigger) Selects the trigger point in the
video signal.
field 1 or 2
line 1~263 for NTSC, 1~313 for
PAL/SECAM
Pulse condition
(pulse trigger)
Sets the pulse width (20ns ~ 10s)
and the triggering condition.
> Longer than = Equal to
< Shorter than
≠
Not equal to
Trigger slope Triggers on the rising edge.
Triggers on the falling edge.
Trigger coupling AC Triggers only on AC component.
DC Triggers on AC+DC component.
Frequency rejection LF Puts a high-pass filter and rejects
the frequency below 50kHz.
HF Puts a low-pass filter and rejects
the frequency above 50kHz.
Noise rejection Rejects noise signals.
Trigger level Using the trigger level knob moves
the trigger point up or down.