Increasing ADC Buffer

[eeyc]

hii!!!
i am trying to read samples Using the DAQmx Timing to dermin the rate
but i am limited 7250(Hz) Rate
i dont wont to reduce  the rat,i need at high frequncy reading.
it possible to increase buffer size to avoid 200019 exception?

i need to take semples at  10k(Hz) Rate even more

i am using internal clock
and i have 6229 pci card

Thank's

eyal
 

[Norbert_B]

Eyal,

before people are starting to asume things, it would be better if you'd attach the code you are currently using...

Norbert

[Wallace_F]

Hello Eyal,

To begin with, I agree with Norbert in that it would be a lot more helpful to look at your code so that we can see how you are acquiring data.  But, if you are using DAQmx and LabVIEW, you can configure the input buffer using the DAQmx Configure Input Buffer VI.  You can find this VI in the DAQmx Advanced Task Options subpalette of the DAQmx palette.

Best wishes,

Wallace F.

[eeyc]

sorry...
i try to do it but it isn't work
eyal

[Norbert_B]

eyal,

the reason for the limited samplerate is simple:
The 6229 supports 250kHz samplerate for ALL channels together (http://sine.ni.com/nips/cds/view/p/lang/en/nid/14136) and you destribute this samplerate to 34 channels (32 ais and 2 internals). Therefore, each channel will sample at maximum with 250k / 34 = 7350 Hz.

hope this helps,
Norbert

[eeyc]

Thank's.....
i can control the frequency rate each channel alone?,how?
or it have to be all channels thogeter?
because i was thinking that i don't need high frequency at all channels so mybe
i can manage the the frequency quantity that i have to the right places.

eyal

[RavensFan]

No.  All channels have to be sampled at the same frequency rate.