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Try the Fluke 430 Series Three-Phase Power Quality Analyzers. I haven't used it but we did use the Fluke 41 which was an older single phase version.

Thanks VolkerR. Actually what we are looking at doing is a bit of a fiddle. We are going to use our own protocol either way. We are trying to decide which to use based purely on the merits of the electrical interface of each. So I guess that is actually the question I am asking.

OK, thanks guys. I hadn't considered fibers.

Sorry, max length of say 100 feet

Just normal serial data up to 38.4 kpbs Thanks

Hi, I am trying to decide which interface to use - CAN or RS-485. The bus will be within a high power (50kW) broadcast transmitter operating in the AM band (500 - 1800 kHz). My main concern is the noise immunity of either standard. Any comments or suggestions you might have to sway me...

Check out the Aromat website (www.aromat.com. They make a large variety of latching relays.

Thanks again for all the helpful info.

RickoZone - It is the square root of 3 - not 2, in your formula.

Check the ITU Regulations (International Telecommunications Union) and local authorities.

Don't forget the coefficient of coupling between the coils in your calculations. And as stated in other posts - look at the output with an oscilloscope. Make sure you have sufficient primary inductance for the desired waveform.

Thanks to all for the information. It's exactly what I was looking for. Brennaj

Thanks Felixc, I guess the question I should have asked with respect to SPI and I2C was which one (if any) you prefer to use and why.

I am trying to decide which serial standard to use in a data acquisition and diagnostic system I am working on. I can buy IC's with either interface to do the job. Any suggestions or comments based on your own experience would be helpful. If this topic has already been dealt with in a...

Lewish: Based on your explanation of the system I agree with IRStuff's logic that the 55kHz signal is amplitude modulated by the 1 to 3Hz "tone". The spectrum of that is a 55kHz tone and two sidebands. Assuming you want to recover the 1 to 3Hz tone the simplest method is an envelope...

Give me a bit more info. How is the 3Hz being modulated on the 55KHz or are they being modulated at all, perhaps just added? Is the '3 Hz modulation' being done on purpose or is this the problem you are dealing with? Maybe you could post the mathematical equation of the 'signal' - ie 55kHz...

"I have an amplitude modulated 55KHz signal and I want to mix it with a 55KHz carrier and extract the sum and difference signals without the 55KHz carrier" What I get from the above is you have a 55kHz carrier with two sidebands and you want to extract the sidebands and ditch the...

1) Sorry Nbucska I spelled your name wrong in my last post. 2) Lewish: I found this is an old scribbler of course notes I have. Assume cosA is the input and cosB is the local oscillator. Single Balanced Mixer (2 diodes) The simple mathematical explanation is the input cosA is multiplied by...

Nbrucksa: I don't think we're comparing apples to apples here. The equation in the original post 2cosAcosB is the mixer equation and yields double side band suppressed carrier modulation. There is no carrier term as the math shows. cosAcosB = 0.5cos(A+B) + 0.5cos(A-B) This latest equation...

I did the math and I don't see any carrier term. Check this: cos(A+B)=cosAcosB-sinAsinB (Eq 1) cos(A-B)=cosAcosB+sinAsinB (Eq 2) Add Eq 1 to Eg 2 cos(A+B)+ cos(A-B)=2cosAcosB Divide both sides by 2 0.5(cos(A+B)) + 0.5(cos(A-B))= cosAcosB