Pause Trigger Considerations for E Series and M Series Devices

The source of your sample clock often can affect when your acquisition or generation pauses and resumes with the assertion and deassertion of a Pause Trigger.

Analog Input

When you measure analog input signals and the Pause Trigger is asserted, the current sample across all channels finishes before pausing. For instance, if you are sampling four channels and the second channel is being sampled at the time the Pause Trigger is asserted, the second, third, and fourth channels complete their sample before the acquisition pauses. If you are using the onboard clock as the source of your sample clock, the acquisition resumes as soon as the Pause Trigger is deasserted.

If you are using any signal other than the onboard clock as the source of your sample clock, the acquisition resumes as soon as the Pause Trigger is deasserted and another edge of the sample clock is received as shown in the following figure.

Analog Output

When you generate analog output signals, the generation pauses as soon as the Pause Trigger is asserted. If the source of your sample clock is the onboard clock, the generation resumes as soon as the Pause Trigger is deasserted.

If you are using any signal other than the onboard clock as the source of your sample clock, the generation resumes as soon as the Pause Trigger is deasserted and another edge of the sample clock is received as shown in the following figure.

Counters

Continuous pulse-train generation: The pulse-train generation pauses as soon as the Pause Trigger is asserted, not at the end of a pulse. The pulse train resumes after the Pause Trigger is deasserted. A Pause Trigger elongates either the high or low pulse depending on which one was being generated at the time the Pause Trigger was asserted.

Nonbuffered edge counting: The counter stops counting edges as soon as the Pause Trigger is asserted and resumes counting edges after the Pause Trigger is deasserted.