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TH2830 vs TH2832

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KungFuJosh:

--- Quote from: mawyatt on August 22, 2023, 11:34:15 pm ---This might be a "DC" measurement but with flipping the polarity to remove thermal EMF and other offsets, so the 12Hz would be the flipping rate, but I'm not sure about this. Might take a look later.

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I'm curious if it's the same on yours and the other LCRs discussed here. Also curious if it actually matters.

KungFuJosh:
I asked about it, and this is what one of the ST guys said:


--- Quote ---well, it is sort DC, just in sections ... and it is definitely not a sinus either.
The reasons for alternating polarity are that by joining different metals, you usually get a thermocouple contact which adds a temperature-dependent voltage. To eliminate its effects, common practice is to measure in different directions and determine the average. Also, if you use unidirectional current on a cored inductor, the core will go into saturation, and remanence will mess with subsequent other measurements.
The disadvantage is it doesn't work so well with large inductances where the current takes longer to settle than the alternation time.

The 2830 series has basically the same functions and menu structure as the 2829 series, but as it is a stripped-down version, not all of them are implemented in the 283x. DCR POL is one of them. It was planned to add a setting other than ALT later, but by then the hardware apparently was designed in a way that wouldn't allow switching between alternation and not, so they told me years ago they couldn't add it just in firmware.

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