Electronics > Metrology

True rms converters

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Vgkid:
Since I do nothave a stable ac voltage source I thought that I would build one using the schematic from the LTC1968. Since they are only a few offerings from LT/AD/Maxim. This would increase the odds that others would have dealt with them. My own multimeters(Fluke 87/34401) have these chips inside. There fore, they should be pretty good.
That is not what I'm after. What I would like to know is how stable are these chips(day,months,yearly) drift rates, and what is the tempco of these units.  I will be using a fixed frequency, and voltage.

tszaboo:
I've used them. They are some 0.1% accurate. Not the most accurate things in the world, but for AC it is very good in fact. I definately prefer them over any heat transfer RMS or those pseudo RMS things from Analog devices. They do some delta-sigma magic in them, but that is OK. Very important, use a good quality foil capacitor on the output.

TiN:

--- Quote --- I definately prefer them over any heat transfer RMS or those pseudo RMS things from Analog devices.
--- End quote ---
Why so both ways? I think more detailed reasoning could help others to understand better too.

e61_phil:

--- Quote from: TiN on June 29, 2016, 10:33:09 am ---
--- Quote --- I definately prefer them over any heat transfer RMS or those pseudo RMS things from Analog devices.
--- End quote ---
Why so both ways? I think more detailed reasoning could help others to understand better too.

--- End quote ---

I'm also interested in any answer to this question. I've bought a Fluke 540B thermal transfer standard for AC measurements some time ago..

ebclr:
Another interesting circuit


http://www.linear.com/solutions/1594

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