how to read analog input channels from a R-series board for (PXI-7851R)

[KevinKM]

Can you please guide me with the steps for reading analog input from a r series board. I am using PXI-7851R as the fpga target.

[dan_u · Accepted solution]

Did you look at the examples that ship with LabVIEW? There are examples showing how to read analog inputs.

[KevinKM]

Thanks for your info.I have gone thro examples for R series. It was very much helpful. I was able to read the analog input channels in the FPGA VI. I have to conduct a Loop back test i.e i have to get the Analog Output from the target device for the corresponding Analog Input. Can you please help me out with this. I am using PXI-7851R as Fpga target and a M series connector0 SCB-68.

[KevinKM]

Thanks for your info.I have gone thro examples for R series. It was very much helpful. I was able to read the analog input channels in the FPGA VI. I have to conduct a Loop back test i.e i have to get the Analog Output from the target device for the corresponding Analog Input. Can you please help me out with this. I am using PXI-7851R as Fpga target and a M series connector0 SCB-68.

[dan_u]

Do I understand correctly that you read e.g. AI1 and want to write this value to AO1? Where exactly do you have a problem doing this? What did you try so far?

[KevinKM]

Thanks dan_u,        

I have read AI1, its working fine., the problem is with writing this to AO1, i am not sure on how to go about it. I am a beginner in labview. PL help me with this.

[dan_u]

What is the problem with writing to AO1? Show some code.

The easiest setup I could think of is a loop running at 750 kHz (maximum AI speed), read AI, wire the value to a feedback node, wire feedback node output to AO.

[KevinKM]

Thanks dan_u,

I could find a sloution to the problem. I am getting the analog output at the AO0 channel.  i am able to measure the RMS voltage using Multimeter at the AO0 channel.. Real problem is I am not able to acquire the signal in the oscilloscope. Is there a problem with the connector device? Does the connector device needs external power supply? i am unable to figure it out.  The connector device is unable to drive the voltage to the oscilloscope. Pl help me out with this.

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