User manual

Reference
Pretrigger. Th
e trigger position is typically set at the horizontal center of the
screen. In this case, you are able to view five divisions of pretrigger information.
Adjusting the Horizontal Position of the waveform allows you to see more or less
pretrigger information.
Video Trigger
Options Settings Comments
Video With Video highlighted, triggering
occurs on an NTSC, PAL, or SECAM
standard video signal
Trigger coupling is preset to AC
Source CH1, CH2, CH3
1
,CH4
1
,
Ext, Ext/5
Selects the input source as the trigger
signal; Ext and Ext/5 selections use
the signal applied to the Ext Trig
connector
Polarity Normal, Inverted Normal triggers on the negative edge
of the sync pulse; Inverted triggers on
the positive edge of the sync pulse
Sync
All Lines, L ine Number,
Odd Field, Even Field, All
Fields
Select an appropriate video sync
Use the multipurpose 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
1
Available only on a 4-channel oscilloscope.
Key Po ints
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
Pulse With Pulse highlighted, triggering
occurs on pulses that meet the trigger
condition defined by the Source,
When, and Set Pulse Width options
Source CH1, CH2, CH3
1
,CH4
1
,
Ext, Ext/5
Select the input source as the trigger
signal
When =, ≠,<,>
Select how to compare the trigger
pulse relative to the value selected in
the Pulse Width option
Pulse Width 33 ns to 10.0 sec Use the multipurpose knob to set a
width
TBS1000 Series Oscilloscopes User Manual 97