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UTD4000 Four-channel User Manual
Illustration 3 : Acquiring single signals
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The advantage and special feature of your digital
storage oscilloscopes lie in its ability to acquire non
cyclical signals like pulse and glitch. To acquire a
s i n g l e s i g n a l , y o u m u s t h a v e t r a n s c e n d e n t a l
knowledge of that signal to set the trigger level and
trigger edge. For example, if the pulse is a logical
signal of TTL level, the trigger level should be set at
about 2V and the trigger edge should be set to rising
edge trigger. If you are not certain about the signal,
you can observe it by automatic or normal trigger to
determine the trigger level and trigger edge.
Steps :
1.
As in the previous illustration, set the attenuation
factor of the probe and CH1.
2.
Carry out trigger setup.
Press [
] in the trigger control zone to
display the trigger setup menu.
In this menu, use F1~F5 menus to set the trigger
type to edge
set trigger source to Ch1
set
trigger coupling to DC
set trigger mode to
single and set slew rate type to rising
Adjust horizontal time base and vertical range to
an appropriate range.
Turn the
knob to get the desired level.
Press [
] and wait for a signal that
meets the trigger condition. If any signal reaches
the set trigger level, the system will sample once
and display it on the screen. By using this
function you can easily acquire any occasional
event. For example, when a sudden glitch of
relatively big amplitude is acquired : set the
trigger level to just higher than the normal signal
level. Press [
] and begin waiting.
W h e n a g l i t c h o c c u r s , t h e m a c h i n e w i l l
automatically trigger and record the waveform
immediately before and after triggering. By
turning the horizontal
knob in the
horizontal control zone on the front panel, you
can change the trigger position horizontally to
achieve negative delay trigger of various lengths
for easy observation of waveform occurring
before the glitch.
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,
,
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