open zero crossing channel offsets

[mseybold]

Was wondering if someone could help me.  Am looking to calculate the zero crossing formula to ensure my test limits and parameters are correct in the test program.  I’ve attached a .jpg file of the zero crossing circuit and .vi file.  Do you know of a formula I can use to determine if the number of crossings anticipated are correct?  Or can someone please tell me how to change a channel offset?

 
In this test an AC voltage at about 10v and 120 Hz is applied to all high speed channels.  A large offset is programmed into the DUT for all channels but one.  Because the voltage is small it never reaches the magnitude of the offset programmed into those channels.  Only the channel with no programmed offset triggers the zero crossing detector.  Using this method, each channel is checked in turn until all channels have been checked and associated as voltages and zero crossing pairs.

Thank you!

Mark

[johnsold]

A picture of your  front panels does not tell us anything about how your VI works or does not work.  Please post the actual VI with some typical data saved as default.

Show with some comments on the block diagram or front panel what does not work and what you want it to do.

Lynn

[mseybold]

How do I export the .vi file out of the .llb file?  Sorry, I'm learning LabView as I go here.

[mseybold]

Sorry, got it. 🙂

[johnsold]

File >> Save As..   Then give it a new location outside the .llb.

If you have not already done so, look at the online tutorials for LV.  It may save you a lot of time and questions about the fundamentals.

Lynn

[johnsold]

I thought your front panel looked old.  I cannot open the LV 5.1 VI.  If no one responds here soon, you may want to post the VI to the thread where people "modernize" VIs and then post a newer version here.

Lynn

[mseybold]

Ok, thank you very much for your help!