Tektronix DPO2304SX, Printable Help

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8. In the Transition drop-down list:
NOTE. On MSO/DPO5000B Series instruments, < or > options are available instead of Less Than or Greater Than.
■ Click Less Than to trigger when the transition time is less than the time you set above.
■ Click Greater Than to trigger when the transition time is greater than the time you set above.
NOTE. If you select Transition Greater Than, and the instrument does not trigger, the pulse edge may be too fast. To
check the pulse edge speed, switch to edge triggering. Trigger on the pulse edge and determine the time the edge
takes to travel between the upper and lower levels that you set for this trigger. The instrument cannot transition trigger
on pulse edges that traverse between threshold levels in 600 ps or less. Also, to reliably trigger on transition time, a
pulse must have a width of 7.5 ns or more. A pulse of less width may trigger on the wrong slope or not trigger at all.
Switch to edge triggering, and check the pulse width if you cannot trigger on transition time as expected.
9. You can also Trigger on a logic-qualified pulse using the Trigger if Violation "Logic" selection. When the instrument detects
that a transition violation 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.
10. 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 setup-hold time violations
Use the following procedure to detect and trigger on setup and hold time violations. The setup and hold times define a violation
region relative to a clock. Data is considered to be invalid in the violation region.
1. Push the front-panel Advanced button.
2. In the Trigger control window, open the A Event tab.
3. Select Setup/Hold from the Trigger Type drop-down list.
4. Specify the channel that is connected to the data signal. Click Source; then select a channel from the drop-down list.
5. Specify the channel that is connected to the clock signal. Click Clock Source; then select a channel from the drop-down list.
NOTE. Do not select the same channel for both the data and clock sources.
6. The Clock Edge determines whether the instrument finds the trigger point on the rising edge or the falling edge of the clock
signal. Click a Clock Edge button.
7. To set the data transition level, click in the Data Level entry box, and then use the multipurpose knobs or pop-up keypad to
set the value.
8. The instrument uses the clock level to determine when a clock edge occurs; the point that the clock crosses the clock level
is the reference point from which it measures setup and hold time settings. To set the clock threshold level, click in the Clock
Level entry box, and then use the multipurpose knobs or pop-up keypad to enter a value.
NOTE. Both Clock and Data Levels can be set to a value appropriate to either the TTL or ECL logic families by clicking TTL
or ECL on the Data Level or Clock Level pop-up keypads.
9. To set the setup time relative to the clock, click in the Setup Time entry box, and then use the multipurpose knob or pop-up
keypad to enter a value.
How to ?
632 DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series