User manual

29
UNI-T
®
UT4000 User Manual
Table 2-8 (Con’t)
Function Menu Setup Explanatory Note
Trigger mode Auto
Normal
Single
The system automatically acquires waveform data when
there is no trigger signal input. The scan baseline is
shown on the display. When the trigger signal is
generated, it automatically turns to trigger scan.
The system stops acquiring data when there is no trigger
signal. When the trigger signal is generated, trigger scan
occurs.
One trigger will occur when there is an input trigger
signal. Then trigger will stop.
Pulse width setup See Table 2-9 Set the pulse width.
Table 2-9 Pulse width setup
Pulse width
polarity
Positive
Negative
Set the positive pulse width as the trigger signal.
Set the negative pulse width as the trigger signal.
Pulse width
condition
<
>
=
Trigger occurs when pulse width is smaller than the set
value.
Trigger occurs when pulse width is larger than the set
value.
Trigger occurs when pulse width equals to the set value.
Pulse width time
⎯
Set pulse width to 20ns-10s with the multifunction
control knob on the front panel.
Return
⎯
Return to Table 2-8.
Video Trigger
By selecting video trigger, you can carry out field or line trigger with NTSC or PAL
standard video signals. Trigger menus are as follows :
Table 2-10 Video trigger setup
Function Menu Setup Explanatory Note
Type Video
Trigger source CH1
CH2
EXT
EXT/5
AC
CH1 & CH2
Set CH1 as the trigger signal.
Set CH2 as the trigger signal.
Set the external trigger input channel as the trigger
signal.
Attenuate the external trigger source 5 times as the
trigger signal.
Set grid as the trigger signal.
Set CH1 and CH2 as alternate trigger signals.
Video setup See Table 2-10a
Table 2-10a Video setup
Standard trigger PAL
NTSC
Suitable for PAL video signals.
Suitable for NTSC video signals.
Synchronization Odd field
Even field
All lines
Specified lines
Set the video odd field to synchronized trigger.
Set the video even field to synchronized trigger.
Set the line signal to synchronize with trigger.
Set synchronized trigger on the specified line and adjust
by turning the multifunction control knob on the upper
front panel.
Return
⎯
Return to Table 2-10.