How do i pulse a relay accurate at e.g. 250 msec?

[XTrevor]

Hello together,

i want to simulate a button press  on some hardware for a certain time. Therefor i need to use NI 2566. Is it possible to switch a relay on for deterministic time (range 10 - 1000 msec)?

Can i do this by hardware?

One solution is to generate this pulse with a counter card (NI 6602) and connect this signal to an external relay (incl. relay driver). But is there another solution to do this with one card?

Thank you in advance

XTrevor

[chericks1]

Hi XTrevor,

The NI PXI-2566 has a maximum operate time specification of 4.4 ms, so the maximum error in a close and open operation would be 8.8 ms.  Is this acceptable for your deterministic (10 ms) application requirement? 

If acceptable, then I can think of two ways to accomplish the deterministic relay operations. 

1. (Windows) Create a known connection list (scan list) and download it to the board, iterating through the connections with a deterministic hardware trigger.

2. (Real-Time) Simply program with the NI-SWITCH or DAQmx driver and add a software wait time to deterministically close and open relays.

Hope this helps!

Chad Erickson

Switch Product Support Engineer

NI - USA