How do I vary the voltage of a DC power source in a sine pattern around a certain voltage?

[airic001]

Hello all!  I'm using a GW Instek PST-3202 DC power supply to apply a voltage to a cartridge heater to heat an aluminum block.  I want to apply a sine wave that varies the voltage by +0.05 V to -0.05 V centered around 15 V (from 14.95 V to 15.05 V).  I can manually set the voltage of my power supply to 15 V using the analog controls on the power supply itself, but as soon as I turn on my VI it resets to 0 V, which I don't want.  Also, it says there is a read timeout, and I'm not sure why.  I'm very new to LabVIEW so this may be a very easy fix, but any input would be greatly appreciated!  My VI is attached, as well as the VI I am using to monitor the temperature, just for completion.

[IanW]

You can add your offset (15 v in your case) to the output of your sine wave function.

[airic001]

This is probably dumb, but I don't know how to do it.  The output of the sine waveform only has the functions for the sine wave, phase out, and error.

[Yamaeda]

Try adding an offset to the generated waveform. 😉

/Y

[airic001]

I reiterate, I don't know how to add an offset to the waveform, it is not an option on the sine wave object.  I found the function I'm using in Signal Processing -> Signal Generation -> Sine Wave.  Perhaps I'm using the wrong function for what I want to accomplish?

[Dennis_Knutson]

Very simply, use the arithmatic Add function. Wire a constant to one input and your waveform to the other.

You really need to take one of the free tutorials.

[airic001]

I've followed all of the advice ITT, but I'm still getting a timeout error on VISA Read.  I added a wait between the write and read functions, as a tutorial told me I should, but I'm still having a problem.  Also, I feel like the sine pattern function isn't creating a continuous sine pattern, but that may be because the VISA Read is timing out still.  My VI is attached.  I know I need to take a free tutorial, but I haven't had the time yet.

[camerond]

Working a good online tutorial or two will take you much less time than it's taking you now thrashing around without getting anywhere. I'd suggest starting with the ones I stole the links for to put on the bottom of my signature.

Cameron

[IanW]

You've added the 15v to the Phase Out, it needs to be added to the Sine Wave output array.

[IanW]

If you go to Help, Find Examples and search for the 'Basic Serial Write and Read.vi', that should help you with your code.