Creeping current while generating 2 PWM signals and one DC AO with the NI USB-6259 possible?

[Kambra]

Hello there!

I would like to use the USB-6259 to generate two independent PWM signals using the two counters of the device and send them to two of the four available anolog outputs. Additionially I would like to use the third AO to generate a variable DC output.

Now I would just like to now if I have to fear any creeping currents that might destroy me PWM signal or if everything should be fine doing it this way?

Thanks in advance,

Kamil

[Dominik55]

Hallo Kamil, 

here is Dominik from the AE's in Munich. 

Which USB 6259 device do you use. Can you give me the full marking? 

Best regards,

Dominik

[Kambra]

Hi Dominik,

it's the modul 779628-04 with the two connectors which you can see in the 6th picture of the other views.

There is also a small update on the signal output:

Of course I won't use the AO for the PWM signal but instead I will simply send the counter outputs to two PFIs, thus the only AO will be the one for the set point of the PID-controller.

Additionally there will be now an AI from a massflow counter which has a range of 4 - 20 mA.

Kind regards,

Kamil

[Dominik55]

Hi Kamil, 

The AI is oparated with 5 - 10V. The maximum voltage and currents which are allowed are described in the specifications of your target.

Attached i send you a tutorial for generating PWM with LabVIEW. Perhaps it would be better when you use the national instruments examples in LabVIEW. You can find it under Help-> Find example. 

Pherhaps it would be better when you send your programmed code when you have problems.

Best regards

Dominik