DAQPad 6015 under memory problem?

[128]

Dear friends:

i am trying to generate pulse signal (10 Hz, 0-2 Volts). and i hope every seconds this pulse signal can output 10 pulses. and i want to count pulse number to confirm how many pulses have been output.

does any one have some idea to do it?

i put my vi. in the attachment. and there is always a problem of 'device memory underflow'.

any one can help me?

cheers

dan

[devchander]

The ideal situation would have been generate 10Hz signal on one of your AO channels and if the amplitude is less than TTL high ( < 5V), you can loop it back and measure using your counter channel

But this Hardware has one drawback

Its AO update rates are pretty low

Software timed = 300 samples/sec

Hardware timed = 50 samples per sec

and both these values are system dependent

So I cannot assure that you will be able to generate a good10Hz Pulse with such low update rates

( with 300 samples/sec, you must be able to, but definitely not a good quality pulse with a 50 samples /sec update rate)

Hope this helps

Dev

[128]

thank you Dev:

i never know that the AO update is so low. 

according to your information, i can not generate a 100 Hz pulse, since AO updat rate is may be less than 300 samples/second.

thank you any way.

i will keep trying.