Reactive power - Reactive Generator research from GotoLuc - discussion thread

[barbosi]

Hi poynt and all,

here is a video update with the scope set to DC coupling. I'm still questioning the channel 2 Inversion.
Can you please confirm which way it is and what is Watts used

Video: http://www.youtube.com/watch?v=gTJ8i5unIwQ&feature=youtu.be

Thanks

Luc

In the probe menu as far I can see your probe (which is a voltage probe), you should not chose current probe. Tek has its own current probes and it knows how to deal with their characteristics. While you have your own shunt and measuring voltage across... you get it. same you should not trust agilent current probe on tek, and so on.

Example of a current probe notice the orifice to insert the cable:
http://cdn7.us.yokogawa.com/uploaded/701928_29_5.jpg

From Tek:
http://www.tek.com/sites/tek.com/files/media/image/TCP202DCCoupledCurrentProbe-1-L.jpg

PS: In fact, there are other types of current probes, for IC, etc. Tek will recognize it from the pins on the connector. All pretty expensive. Since you are not looking at the edge of visible spectrum or brain surgery, you can stick with the poor man's tools, shunt & voltage probe.

[poynt99]

In the probe menu as far I can see your probe (which is a voltage probe), you should not chose current probe. Tek has its own current probes and it knows how to deal with their characteristics. While you have your own shunt and measuring voltage across... you get it. same you should not trust agilent current probe on tek, and so on.

Example of a current probe notice the orifice to insert the cable:
http://cdn7.us.yokogawa.com/uploaded/701928_29_5.jpg

From Tek:
http://www.tek.com/sites/tek.com/files/media/image/TCP202DCCoupledCurrentProbe-1-L.jpg

PS: In fact, there are other types of current probes, for IC, etc. Tek will recognize it from the pins on the connector. All pretty expensive. Since you are not looking at the edge of visible spectrum or brain surgery, you can stick with the poor man's tools, shunt & voltage probe.

We've been through this already here in this thread, and it was I that was giving Luc a hard time about using a voltage probe as a current probe. But I have tried this on my Tek scope and not only does it work, but I can see no reason why it is not a valid method.

[barbosi]

We've been through this already here in this thread, and it was I that was giving Luc a hard time about using a voltage probe as a current probe. But I have tried this on my Tek scope and not only does it work, but I can see no reason why it is not a valid method.

So you determined that a Tek current probe is linear as a 0.1Ohm resistor he is using? Others may not have the shunt like that but rather 700mv@200A. They should know they have to use a different approach.

Or make a standard poorman's procedure, but I may be wrong and all would know how to handle it.

[poynt99]

So you determined that a Tek current probe is linear as a 0.1Ohm resistor he is using? Others may not have the shunt like that but rather 700mv@200A. They should know they have to use a different approach.

Or make a standard poorman's procedure, but I may be wrong and all would know how to handle it.

I determined that using a 0.1 Ohm CSR, one can select current for probe CH2, and one can also set the scaling for 100mV/A so that CH2 will read directly in the correct mA.

Yes, the measurement is sufficiently accurate for these measurements at 60Hz. If that CSR was replaced with a good non-inductive resistor, we could do high frequency measurements as well. Actual Current probes are non-intrusive, but they produce a voltage output just as a voltage probe across a CSR does.

[gotoluc]

I determined that using a 0.1 Ohm CSR, one can select current for probe CH2, and one can also set the scaling for 100mV/A so that CH2 will read directly in the correct mA.

So poynt, what is your decision on channel 2... Inverted or not Inverted?

Thanks

Luc