Explanation Of Nouns - UNI-T UTD2000 Series User Manual

Normal
Single
AC
DC
Coupling
HF
LF

4.5 Explanation of nouns

(1) Trigger source: trigger can be achieved from several signal sources: input channels
(CH1 and CH2), external triggers (EXT and EXT/5) and AC line.
■ External trigger (EXT TRIG): meaning to set the triggering source base on given
external connection to the "EXT TRIG" input channel. This can be signification application
for UTD2000 series to perform data acquisition using CH1 and CH2 based on an external
clock signal connects to the "EXT TRIG" input channel. External trigger signal connects to
"EXT TRIG" input terminal is used for EXT trigger source selection. When selecting EXT
as trigger source, external trigger levels voltage range limited to -3V and +3V.
■ AC line trigger: use AC line power as trigger source. This can be signification
application to observe the signals correlated to AC line power for applications in lighting
equipment and power supply equipment R&D development.
(2) Trigger mode:deciding the behavioral pattern of DSO under no trigger event
conditions. Three trigger modes are provided for DSO: auto, normal and single.
■ Auto trigger: Set to automatic trigger mode. The DSO will continuously perform data
acquisition without triggering signal. When there is trigger signal, DSO will automatically
synchronizing with the trigger signal.
Attention: when scanning waveform is set as 50ms/div or slower time base, no trigger
signal is allowed under "auto trigger" mode.
■ Normal trigger: Set to normal trigger mode. The DSO will only perform data
acquisition only when trigger conditions are satisfied. When trigger condition is not
satisfied, DSO stops data collection.
■ Single trigger: Set to single trigger mode. The DSO will only perform one cycle of data
acquisition only when trigger conditions are satisfied. When trigger condition is not
satisfied, DSO stops data collection.
without triggering signal.
Set to normal trigger. The DSO will only perform data acquisition when there is
triggering signal.
Set to single trigger. The DSO will only perform 1 cycle of the data acquisition
when there is triggering signal.
Block the DC component of triggering signal
Pass through DC and AC components of triggering signa
Reject high-frequency component of the triggering signal (over 80kHz signals)
Reject low-frequency component of the triggering signal (below 80kHz signals)
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UTD2000 Series User Manual