cdaq 9188 sample rate diadem problem

[MaddinK]

Hi,

I try to use DIAdem with a cDAQ 9188 chassis. I alredy have some issues with the sampling rate when I only use a NIDAQ-In and NIDAQ-Out Block to just emit the same voltage that I am measuring. Here some information about the system:

- NI cDAQ-9188 with:
    1. NI 9205 -> AI
    2. NI 9264 -> AO
    3. NI 9401 -> DO
    6. NI 9232 -> AI with IEPE
    7. NI 9232 -> AI with IEPE
    8. NI 9232 -> AI with IEPE

- NI MAX v 5.5.0f0
- DIAdem 647.3.1f5361 Service Pack 1a
- Win7 on a Intel Core I5 3360M with 4GB Ram

I aranged some global vitual channels (AI and AO) in the NI MAX and only have sample rate block, the NIDAQ-IN, the NIDAQ-Out and a Visualation Block in my DAC. I use the software-rate as I need it for further DAC blocks.

I already get a "Buffer overflow" @ 500 Hz sampling rate.

I had much more complicated DAC sheets that worked with my old NI USB-6259 @ 1000 Hz on even slower PCs.

Is there something wrong with the setup, the system or is this arrangement not usable at higher sampling rates?

Kind regards,

Martin

[Riepld]

Hi Martin,

i'm a little bit confused, which DiAdem Version do you have, 2012?

Can you upload your DAC diagram?

Best regards

Dominik

[MaddinK]

Hi Dominik,

thanks for your reply.

I tried it with Diadem 2012 Service Pack 1a and for testing purpose I used the attached "stupid" DAC. 🙂

I am not able to use the NiDAQ-IN and NiDAQ-Out in the same DAC sheet at sample rates higher than 100 Hz.

Kind regards

Martin

[Riepld]

Hi Martin,

now i have tested your system with the device setting, but at moment only with simulated devices.

Maybe you can make it with a simulated device too, only for testing. The next thing did you tried

to delete the output and test it without it. 

The last thing is can you tell me which AI and AO you use for your test, which card and which channel.

best regards

dominik

[MaddinK]

Hi Dominic,

i tested it with simulated devices and it works quite well. Much higher sample rates are possible.

I just use the ai0 of the NI 9205 and the ao0 of the NI 9264 for testing. It already does not work with these two.

If I remove either the Output or the Input the system works at higher sample rates up to 2000 Hz.

I tried an older Win XP Computer today but that was even worse... 😞

Kind regards,

Martin

[Riepld]

Hi Martin,

have you tried to use different sample clocks? Maybe when one device sample faster you can avoid the buffer overflow.

Best regards

Dominik