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Well, this is my very own discussion? I've started the thread because I have some questions about building a testbench. The question about differential probes is related to my testbench.

Thanks for the answers! I'm quite new in the world of power electronics, so I was wondering what the difference between a "normal" voltmeter and a differential probe is?

You were right, thanks! Another question: I'm going to measure te voltage going from te VFD to the motor. Since te voltage doesn't have a perfect sinus-shape, I have to use true RMS to get the right measurment. I'm familiar with RMS, but how do I measure true RMS? I've read something about...

Sorry, forgot that PLS is called PLC in english.

Thanks for all the great tips! I think I'll just stick with the existing load cell, and use the 4-16mA signal. Another question, what is the actually the difference between PLS and DAQ? I know that the DAQ is much faster, but there must be other differences?

I could use the old loadcell setup, and input the measurment to a DAQ, but I really would like to calculate the torqe without it.

I forgot to say that I'm modifying an old test bench, which is built just like you decribed, with a loadcell to measure torque. The old bench is analog, and I want to convert it to digital, so that I can get the parameters on a touchscreen. The touchscreen will also be connected to a VFD so...

Hi everybody! First of all I have to excuse my english, but I hope everybody can understand me. I'm building a test bench for AC motors, where the AC motor will be connected to a DC motor(will be running as an generator) with an adjustable load connected. I've been trying to find a formula for...