UNI-T UTD3025C

Oper ating Man ual fo r UTD 2000/3000
4
3
3
.
4. Pre-trigger/delay trigger: To trigger data acquired
in ahead/after event. Trigger position is often set i
n
the hor izontal center on the screen. You ca
n
observe pre-trigger and delay information of 5di
v
(or 6div). You can also rotate horizontal position to
regulate horizontal displacement of waveform and
review more pre-trigger details. You can observe
waveform in ahead of trigger by observing pre-
trigger data. For i nstance, burring reason can be
shown by observation and analysis on pre-trigger
data after capturing burring during circuit startup
.
Trigger coupling: Trigger coupling can determine
category of signal component conveyed to trigger
circuit. Coupling types include DC, AC, l ow-
frequency inhibition and high-frequency inhibition
.
Pass through all components of signals under
DC mode
.
Ƶ
Ƶ
Ƶ
Ƶ
Obstruct DC c omponents with signal attenuatio
n
to be less than 400Hz under AC mode
.
Obstruct DC components with attenuation of
low-frequency component of less than 80kHz under
“low-frequency inhibition” mode
.
A
ttenuate high-frequency components of more
than 80kHz under “high-frequency inhibition” mode
.