Triggering
TDS 620 & TDS 640 User Manual
2Ć5
H
AC coupling passes only the alternating components of an input signal. It
removes the DC components from the trigger signal. (AC components
above 10 Hz are passed if the source channel is in 1 M
W
coupling; above
200 kHz are passed in 50
W
coupling.)
H
High frequency rejection removes the high frequency portion of the trig-
gering signal. That allows only the low frequency components to pass on
to the triggering system to start an acquisition. High frequency rejection
attenuates signals above 30 kHz.
H
Low frequency rejection allows only the high frequency components to
pass on to the triggering system by removing the low frequency portion of
the triggering signal. Low frequency rejection attenuates signals below 80
kHz.
H
Noise Rejection lowers trigger sensitivity. It requires additional signal
amplitude for stable triggering, reducing the chance of falsely triggering
on noise.
The adjustable
trigger position defines where the trigger occurs on the wave-
form record. It lets you properly align and measure data within records.
Pretrigger data is the part of the record that occurs
before the trigger; post-
trigger is the part that occurs
after the trigger.
To help you visualize the trigger position setting, the top part of the display
has an icon indicating where the trigger occurs in the waveform record. Use
the Horizontal menu to select what percentage of the waveform record will
contain pretrigger information.
Displaying pretrigger information can be a valuable troubleshooting technique.
For example, to find the cause of an unwanted glitch in your test circuit,
trigger on the glitch and make the pretrigger period large enough to capture
the data before the glitch. By analyzing what happened before the glitch, you
may uncover clues about the source of it.
The slope control determines whether the oscilloscope finds the trigger point
on the rising or the falling edge of a signal (see Figure 2-3).
Set the trigger slope by selecting Slope in the Main Trigger menu and then
selecting from the rising or falling slope icons in the side menu that appears.
The level control determines where on that edge the trigger point occurs (see
Figure 2-3).
Trigger Position
Slope and Level
Содержание TDS 620
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Страница 55: ...In Detail Replace this page with the tab divider of the same name...
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Страница 166: ...Signal Path Compensation In Detail 3 110 Figure 3 53 Performing a Signal Path Compensation...
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