6602 OR time between the redeclenchables task runs

I'm trying to use a signal level TTL of a device to trigger a train of impulses of the 6602 OR. I have no problem getting the 1st pulse train, but the subsequent pulse trains are delayed and no longer synchronize with new incoming TTL signals. I've tested this with trains of pulses consisting of a pulse with no luck. Is there an interval over time required by a redeclenchables task to "recharge"?

It might be interesting to note that the initiator of the TTL trigger product the trigger as a 5V increase 0 and can access more than 0.7mA.

Vadim

Hi Vadim,

The trigger must be re-army in a time base tick or two (12, 5-25 ns if you use the time base of 80 MHz) when the previous impulse over, so this probably isn't the issue.

I expect that you run into is a characteristic of DAQmx how treats the initial delay property for redeclenchables meter tasks.  You can find a description here, but essentially the behavior is to generate a single pulse redeclenchables:

First start: will stay in a State of rest for the Initial delay, then generate a single pulse of time to the high.

All of the following triggers: will be remain in a State of rest for the period, and then generate a single pulse of the desired length of top.

This is true for most of the DAQ hardware.  Recent material (series X, other than the 9172 cDAQ chassis) actually use the behavior waited more than use the initial delay instead some time on each retrigger (with the possibility to go back to the old behavior by setting a property).  On your 6602, my recommendation when generating a single pulse redeclenchables is always set your low time equal to the initial period (the minimum value would be 25 ns).

Best regards

Tags: NI Hardware

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