Tektronix DPO7054C Printable Help

5. Select a Polarity value to specify the direction of the runt pulse. Triggering occurs at the point the pulse returns over the first
threshold without crossing the second threshold level. The polarity selected determines the order that the threshold must be
crossed for a runt trigger to occur:
■
Pos. Looks at positive-going pulses. The lower threshold must be first crossed going positive, then recrossed going
negative without the upper threshold being crossed at all.
■
Neg. Looks at negative-going pulses. The upper threshold must be first crossed going negative, then recrossed going
positive without the lower threshold being crossed at all.
■
Either. Looks at both positive and negative pulses. Either one of the thresholds must be first crossed going in either
direction, then recrossed going in the opposite direction without the other threshold being crossed at all.
For all three polarity settings, triggering occurs at the point the runt pulse recrosses its first threshold.
6. To qualify the runt pulse trigger, click Runt; then select from the drop-down list:
■
Occurs. Triggers on all runt pulses.
■
Wider. Triggers only on runt pulses that exceed the minimum width that you set. Enter the Width using the
multipurpose knob or pop-up keypad.
7. To set the threshold levels, click in the Upper Limit or Lower Limit entry boxes; then use the multipurpose knobs or pop-up
keypad to set the values.
8. You can also Trigger on a logic-qualified runt pulse using the Trigger if Runt "Logic" selection. When the instrument detects
that a runt condition has occurred, it checks the logical state of 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.
TIP. To use the trigger level marker to help in setting the threshold levels, open the Display control window Objects tab; then
click Long to activate the marker.
9. You can set the mode and holdoff for all standard trigger types. Refer to trigger mode and set holdoff to learn more about
trigger mode and holdoff.
Trigger on a pulse width
Use the following procedure to detect and trigger on a pulse that is either wider or narrower than the specified range:
1. Push the front-panel Advanced button.
2. In the Trigger control window, open the A Event tab.
3. Select Width from the Trigger Type drop-down list.
4. Specify the trigger source. Click Source; then select a channel from the drop-down list.
5. To specify the Polarity of the pulse, click Pos (for positive-going pulses) or Neg (for negative-going pulses).
6. To set the range of pulse widths in units of time, click in the Upper Limit and Lower Limit entry boxes; then enter values with
the multipurpose knobs or pop-up keypad:
■
Upper Limit. This is the maximum valid pulse width the trigger source will look for.
■
Lower Limit. This is the minimum valid pulse width. The instrument will always force the Lower Limit to be less than or
equal to the Upper Limit.
How to ?
626 DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series

Tektronix DPO7054C Specifications

General

Brand	Tektronix
Model	DPO7054C
Category	Test Equipment
Language	English