Issue with PXI 7831R

[shareef]

Hi all,

I am using NI PXI 1042 for my academic project, to acquire the leakage current of insulators. For that we tried to use PXI 5112 card initially for acquiring the current waveform. As it is not possible to capture the current waveform directly using PXI 5112, we tried to use PXI 7831 Reconfigurable I/O device. But its not detecting in Measurement & Automation Explorer. Among the total 8 chasis, its shown "Empty" in the place corresponding to PXI 7831R. Please help me in resolving this issue of the problem with the device.. Also please clarify me about whether the 7831R device can be used for acquiring current signals (range varies from 0 to 200mA) directly without any current - to -  voltage conversion as in the case of PXI 5112. Please help me in resolving this issue. 
Thanks in advance....

Note: One more card PXI 7811 which is an I/O device, is also not detecting in M & A explorer. Its also shown Empty in the place corresponding to it.

Please help me in resolving the issues.

[DD]

The 7831R requires the NI-RIO driver. Check the Software limb in the M & A
Explorer (MAX) to see if it is already loaded. You can download the driver
from NI if you don't have it. The analog inputs on the 7831R only measure
voltage. The 7811R also requires the NI-RIO driver. If you haven't done so
already, you should check the data sheets at NI.com for the specifications
of your devices.

[shareef]

Thank you for your response. But the thing is I could not identify whether all the device drivers are installed properly or not. In the MAX, under PXI column, the columns intended for 7831R and 7811 R are shown to be Unknown. But under RIO devices, its shown to be working properly. I have attached the snapshots of the MAX windows here. Please look into the snapshots and help me sorting out the issue. I could not get a clear idea of how to use 7831R with labview, and also with signal express. Please help me with any tutorials or links for materials. Please help me.. Thank you.

[DD]

As far as using the 7813R with LabVIEW, you need the LabVIEW FPGA Module
software. I don't think Signal Express will work; RIO devices are not
Traditional NI-DAQ nor NI-DAQmx devices. In MAX, my PXI RIO devices show up
under the My System -> Devices and Interfaces limb. Further down, under the
PXI limb, I see only a chassis, not individual devices. BTW, your snapshots
didn't attach to your post.


"shareef" <x@no.email> wrote in message
news:1282637413102-1225022@exchange.ni.com...
> Thank you for your response. But the thing is I could not identify whether
> all the device drivers are installed properly or not. In the MAX, under
> PXI column, the columns intended for 7831R and 7811 R are shown to be
> Unknown. But under RIO devices, its shown to be working properly. I have
> attached the snapshots of the MAX windows here. Please look into the
> snapshots and help me sorting out the issue.
>
> I could not get a clear idea of how to use 7831R with labview, and also
> with signal express. Please help me with any tutorials or links for
> materials.
> Please help me..
>
> Thank you.

[shareef]

Hi,

The snapshots might not be uploaded due to bad network connection at the time of posting the message. Now I am attaching here... I dont know whether LabVIEW fpga module is installed in the PC I'm currently using for my academic project. Is it available in function palette of LabVIEW or as a seperate sofware, as Signal express... Please tel me about accessing the LabVIEW FPGA module...

[DD · Accepted solution]

If you haven't already run across the letters 'FPGA' while using LabVIEW,
then your computer doesn't have the module installed. If it were installed,
you would see an icon on the startup splash window, you would have FPGA
options under the Tools menu, and the new project wizard would give you the
choice of creating an FPGA project. It would be odd that your school has PXI
RIO devices and not also have a license for the FPGA module, unless the
devices were donated. Run the NI License Manager and see if you have limbs
for Modules and then for the FPGA Module.

One thing to consider is that pursuing using the RIO devices might be
counter-productive for you. Programming these devices is more complicated
than using DAQ devices, especially if you are just trying to sample signals.
Other than not being able to measure current directly, was the PXI-5112
working? If so, see if you can get a current sensor that outputs voltage.
There are several different types available, including these, which map
+/-50 amps into 5 to 0V:

http://www.newark.com/allegro-microsystems/acs756kca-050b-pff-t/ic-linear-current-sensor-10ma-pff/dp...