The Shop > Electronics & IC Programing
True RMS wattmeter = buy or make suggestions
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picclock:
@PK
Definitely would buy if I could find one to buy, and not too many £££££'s. However I have not found anything out there as yet. There are some on ebay but its hard to know if they are true rms or just average amp times volt types.

If I get time I may just roll my own, as there have been many times in the past that a device like this would be very useful. Also could make it for DC with AC superimposed and with ranges for hi/lo voltages and currents. Price of multiplier chips is quite hi though unless you settle for the less accurate ad633 and its variants.

Best Regards

picclock
awemawson:
Tick Tock,

You don't say what application you have in mind. Are you doing DC measurements, 50 Hz, or are you in the realms of RF, microwaves or what? It makes a huge difference to the correct approach.

 
BillTodd:
RMS volts or current ok

No need for RMS watts  (although i cannot recall why exactly! - something to do with the rms function not giving the answer that one is actually looking for)

Bill,

(too old for this maths *%+/)
awemawson:
The beauty of the old fashioned method (ie hot wire) is that over a wide spectrum it is irrelevant what the wave form is, whether it's steady or pulsed, and within bounds what the frequency is.

After all the heating effect IS the RMS value as I understand it.
John Rudd:

--- Quote from: awemawson on August 17, 2016, 03:38:48 AM ---Tick Tock,



--- End quote ---

 :lol: :lol:......Andrew, you dont arf take some liberties....... :beer:

Btw, aint come across any Ayres Rock yet..... :scratch:
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