Setting up Analog Output in PCI6025E

[E.Gani]

I have a PCI6025E board that I would like to setup such that it outputs a sawtooth data.

I used a Sawtooth function signal generator (range 0-4V), which I connected to AO Continuous Gen. I want to output this to pin DAC0Out, which I set up in MAX as a channel called test.

For testing, I also set up an analog input channel, using Differential mode (using ACH0 and ACH8). I connected the pin from DAC0Out to ACH0 and AOGND to ACH8.

When I tested the results using MAX, I couldn't get a signal, and MAX shows constant 5 V output. When I use a Probe on the waveform data, it shows the sawtooth signal.

Can anyone give me a suggestion how to fix this problem? I have tried the Labview example Continuous Sine Generation and set it
up to test, but I can't get any results out of it as well.

I'm using this setup because I needed a signal generator capable of outputting a sawtooth signal, as well as trying to measure any possible losses through cables and the DAQ board.

Thanks in advance

elton

[Robert M]

Hello elton,

At first glace it looks like you have everything set up correctly. To replicate your situation, I modified the �Simul AIAO Buffer(E-Series).vi� example with a 0-4 v sawtooth signal. I am including copies of this modified example both with and without the input line. They both ran fine, and the copy without the input line tested great with a virtual channel in MAX. If these files don�t address your particular situation, or if you have any other questions, feel free to post a copy of your program and I would be happy to take a look.

Have a nice day!

Robert M
Applications Engineer
National Instruments

[E.Gani]

Hi Robert,

Thanks for your help. Your files are similar to mine, with the exception of the sawtooth example with input line. I could not output and sample in fast enough, probably due to the limitations of 6025E (1 DMA channel)

I have run both files, and wired as per the configuration listed above (DAC0Out to ACH0 and AOGND to ACH8, as well as the 7 other differential channels), and I can't get a response from MAX either. I will ask my colleague to demonstrate his setup that was working previously

Thanks

elton

[E.Gani]

I have tested the DAQ card with an oscilloscope. It shows that the analog out is working perfectly, with the positive connected to DAC0Out and ground to AOGND.

I have tried the NI-DAQ MX self-calibration, but I am not getting any output, even through MAX test panels (AI is configured to Differential mode).

I will do some more testing before committing this to hardware malfunction.

elton