PXI-6229 gives error 200019 when acquiring more than 25ch input

[tabito]

Hello,

I am trying to measure 32ch voltages with PXI-6229 and PXI-8106.

So I build attached VI and It works fine when acquiring less than 26ch input

by setting "Physical Channel" in VI to "PXI1Slot2/ai0:25".

I think PXI-6229 have 32ch Analog Input, but It gives error -200019

when I tried to measure more than 25ch Input by setting "Physical Channel" to "PXI1Slot2/ai0:26".

Please help me fix this.Thanks,

Tabito

[j.terao · Accepted solution]

Hello tabito

Thanks for posting your question on our discussion forum.

I am Junichi Terao from NI Japan.

I have looked into PXI 6229 specification sheet and your VI , and it seems that the error is caused by the sampling rate that you are using. Please take a look at below PXI 6229 specification (page 1):

http://www.ni.com/pdf/manuals/371290g.pdf

The maximum sampling rate of PXI 6229 for multi channel is 250kS/s (aggregate).  So the maximum sampling rate for each channel can be calculated as follow:

fmax=250k / number of channels

When you set 26 channels and sample at 10000S/s, it exceeds 250kS/s. This could be the reason for the error.

If you are planning to use 32 channels, sampleing rate of each channels has to be below 7842Hz

Sincerely,

Junichi

[tabito]

Hello, Junichi

Thank you for your information.
I understand that the error is caused by the limitation of sampling rate.
I set sampling rate to 6250Hz , my system can use 32 channels successfuly.

Thanks,

Tabito