317
Triggering on Window Threshold Violations
Use this procedure to trigger the instrument when the input signal rises above an upper threshold
level or falls below a lower threshold level.
Select window triggering
1.
Push the front-panel ADVANCED button.
2.
On the Trigger Setup control window, select the A Event
tab.
3.
Click Window.
Select the source
4.
To specify which channel becomes the trigger source,
click Source, and select the source from the list.
Set the thresholds
5.
The upper and lower threshold levels define the voltage
limits of the window. To set the threshold levels, click
Upper Level or Lower Level, and use the multipurpose
knobs or pop-up keypad to set the values.
Quality window trigger
6.
To qualify the window trigger, select from these Trigger
When drop-down list combinations. Note that the Trigger
When controls change as you select different combinations
of options.
Inside Limits and Occurs or Outside Limits and Occurs:
Trigger the instrument when the signal enters (or leaves) the
window defined by the threshold levels.
Inside Limits and Wider Than or Outside Limits and Wider
Than: Trigger the instrument when the signal enters (or
leaves) the window defined by the threshold levels for the
time specified by Width.
Inside Limits and Logic or Outside Limits and Logic:
When the instrument detects a signal entering or leaving
the window defined by the threshold levels, it checks the
logic state of up to two other available channels and
triggers only if their conditions are met. Each channel can
have a value of high (H), low (L), or "don't care" (X). A
value is considered high if the channel input voltage is
greater than the specified threshold voltage; a value is
considered low if the channel input voltage is less than the
specified threshold voltage. Use the "don't care" selection
for any channels that will not be used as part of the
pattern. (Logic qualification is only available on 4-channel
instruments.)
Set mode and holdoff
7.
Mode and holdoff can be set for all standard trigger types.
Refer to trigger mode on page 137 and Set holdoff on page
122 to learn more about trigger mode and holdoff.
Summary of Contents for TDS5000B Series
Page 36: ...36 AFTDS Differential Signal Adapter...
Page 280: ...280 Blackman Harris window...
