pxi 4110 and dcpower express vi

[silvia_81]

hi everyone,

I'm really new to labview and I have to use a pxi 4110 to supply dc voltage with a square wave (or whatever shape I chose).
I treid using the "dcpower express vi" but I can't understand how to connect the generated signal. at now I have the wave and I put a block which transforms the wave from dynamic data to array.. but it doesn't work! 

i tried watchin g the examples, but none of them uses power express...

thanks for any help!!

[bronzacuerta]

Hi Silvia

i think you want to use the PXI-4110 in a way it's not thought for!

Anyway, using the ExpressVI it's not possible to generate a custom waveform in output.

You should use low level functions. An example attached to this post.

If your intention is to generate a custom waveform, think to use a MultifunctionalDAQ card.

[TobiasG]

As bronzacuerta mentioned, the PXI-4110 is not intended to generate a square waveform, or any specific waveform. It is intended to regulate a constant voltage or current, adjusting for changing loads. By changing the output using the NI-DCPower API, you may be able to approximate a square waveform, but it will not be a very good one, both in terms of rise/fall times and due to software-timed output updates.

A potentially better option (based on speed/flexibility/accuracy requirements) instead of a Multifunction DAQ card is a signal generator.

Tobias

Staff Software Engineer

Modular Instruments

National Instruments