Reference
Video Trigger
Options Settings Comments
Video With Video highlighted, triggering
occurs on an NTSC, PAL, or SECAM
standard v ide
o signal
Tr igger coupling is preset to AC
Source Ch1, Ch2, Ext, Ext/5 Selects the input source as the trigger
signal; Ext and Ext/5 selections use
the signal a
pplied to the Ext Trig
connector
Polarity Normal, Inv
erted
Normal trig
gers on the negative edge
of the sync pulse; Inverted triggers on
the positive edge of the s ync pulse
Sync
All Lines, Line Number,
Odd Field, Even Field, All
Fields
Select an appropriate video sync
Use the mu
ltipurpose knob to specify
a line number when you select Line
Number for the Sync option
Standard NTSC, PAL/SECAM Select the video standard for sync
and line
number count
Key Points
Sync Pulses. When you choose Normal Polarity, the trigger always occurs on
negative-going sync pulses. If your video signal has positive-going sync pulses,
use the
Inverted Polarity selection.
Pulse Width Trigger
Use Pulse Width triggering to trigger on normal or aberrant pulses.
Options Settings Comments
Puls
e
With
Pulse highlighted, triggering
occurs on pulses that meet the trigger
condition defined by the Source,
Whe
n, and Set P ulse Width options
Sou
rce
Ch1
, Ch2, Ext, Ext/5
Sel
ect the input source as the trigger
signal
Wh
en
=,
≠,<,>
Select how to compare the trigger
pulse relative to the value selected in
th
e Pulse Width option
Pulse Width 33 ns to 10.0 sec Use the multipurpose knob to set a
w
idth
Polarity Positive, Negative
S
elect to trigger on positive or
negative pulses
Mode Auto, Normal
Select the type of triggering; Normal
mode is best for most Pulse Width
trigger applications
TBS1000B and TBS1000B-EDU Series Oscilloscopes User Manual 99
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