same device multiple channel acqusition at different sample rate

[ravindersingh1986]

Hi

I want to acquire signal from NI 9219 from two (or more) channel simoultaneously, at different sample rate for each channel.
Meaning
Channel 1: sample rate = 1kHz
Channel 2 sample rate = 100kHz
Channel 3  samplr rate = 50 kHz
all to be acquired simoutaneously.

Please help

Thnx
Ravinder

[Pnt]

You can have a timed while loop at 100KHz (if your hardware supports it).

At each iteration read the 100KHz channel,

every 2 iterations read the 50KHz,

every 100 iterations read the 1KHz.

This may help

[Ben]

...or if you are not running on a cRIO device, read all channels at 100K and then just toss all of the "extra" data.

Ben

[DFGray]

Don't toss the extra data.  Use it.  You can average for better noise immunity and higher resolution.  You can get max/min/stdev.  There are lots of options...

Of course, you could just toss it.


Message Edited by DFGray on 06-20-2008 07:50 AM

[Ben]

DF wrote;

---

Don't toss the extra data.  ...

Of course, you could just toss it.

---

[PBear]

Haha, that was funny!

I agree with all those posts above. If you don't have a cRIO, those are two good options.

[Kameralina]

The 9219 can handle simultaneous input upto 100 S/s/channel, meaning 100 Hz, which is not in the kHz range that you wanted.


Message Edited by FieldKam on 06-20-2008 01:20 PM