acquire a signal with two differents rates

[Roro8989]

Hello

I would like to acquire a signal with two differents rates and record those two signals into two differents TDMS File. But I don t know how can I do to acquire a signal with 2 differents rates ( for example 1 with 5KHz and the other with 25kHz, in the same time )

Can you help me?

Thank you

Romaric GIBERT

[RavensFan]

Acquire both at 25 kHz and decimate the one set of data so that you only use 1 out of every 5 elements in the array.

[Roro8989]

Do you have an example please?

Thank you

Romaric GIBERT

[Roro8989]

But with this solution I can t choose my rate too, and I would like to choose the rate if it s possible

[Dennis_Knutson]

What do you mean you can't choose your rate? The sample rate is always selectable.

The question of different sample rates with the same hardware has been asked numerous times. The majority of NI's DAQ cards use a card with a mux and a single scan clock so obviously you can't select different sample rates. Some cards have individual A/Ds for each channel. You did not provide the essential information of the actual DAQ card you are using,

[Roro8989]

ok thank you, my card is a PXI 6115, is it possible to acquiere differents rate with this card?

thank you

Romaric GIBERT

[Dennis_Knutson]

I believe you can. Read the manual yourself.

[Roro8989]

So if I can how can I do to program with LABVIEW two differents rates? thank you very much

Romaric GIBERT

[Dennis_Knutson]

One task for each channel and a DAQmx Timing function for each task. A DAQ Assistant for each would be the same thing.

[Roro8989]

OK but I have only 1 channel and I would like to record this channel with two differents rate in the same time. I haven t multiple channel, just one.

Thank you very much

Romaric GIBERT