Yikes - I just realized that Iggy, who blocks posts from Google Groups, will never see this. I really don't have the time or inclination to change news readers right now (I've been down that road before - I ran a major usenet feed in the early 90s), so if someone wanted to forward this to Iggy...
I'm violating one of my rules here "reading and responding to an electronic thread". :-) But it's interesting that so many folks don't seen to understand that point. The read what is on the front panel and "assume". :-) ...lew...
I guess you are saying most people don't have true rms meters which is what Jim is saying.
My 117 is true rms if I can believe the spec sheet, I'm pretty sure the meter I had before it was also. Wish I had it here, I could generate some sine, square, and triangle waves, measure them with the scope and then compare to what the meter indicates. That is subject to a scaling factor of .707 or .577 .
Just to make sure I'm on the right track, 10 Vdc and 10VAC rms has the same heating value?
Average is a series of equally spaced samples of magnitude divided by sample number. RMS deals with P=E^2/R which an average does not.
I'm going to have to go out and snow blow. I wasn't planning on thinking too much before noon today. ;)
Wes
Wes
Done
I unblocked RangersSuck, it is not that I block GG because I do not like it, only because spammers post through it. Thanks a lot for a good thinking on this measuring question.
heating value?
Yes.
First off, the average value of a AC sine wave is.... zero.
Understood. (and thanks, Wes). Getting a better new reader is somewhere on my list of things to do, but Google Groups is just so damned convenient.
Anyway, I'd be real interested in hearing how this missing phase detector works out. RS
Okay, average of the absolute value ;)
It is starting to sound like a good rule for me too. ;)
Wes
I will post an update once I figure out the safest way to do it. Which could be some weeks away. For now I just wired it with three phase and will work on the drive at my leisure.
Again, I have nothing personal against GG users. Only against buy-my-counterfeit-shoes-and-handbags.com spammers.
Like this:
I have some RF ammeters - they are nice - 4 wire thermocouple... Heating effect of a precision coil drives the meter.
It works on DC to RF. Kinda nice military grade meters. (I mean panel meter - not a hand or bench ones.) I have those in Mil grade and in TI grade. My Beckman lost the LCD so I did the same to it.
Mart> >
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