Products > Test Equipment
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.

--- End quote ---

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.

--- End quote ---
GnomeZA:

--- Quote from: KungFuJosh on July 24, 2023, 10:08:23 pm ---If somebody with a 2830 wants to test, the failures on mine were:
100uF was lower than expected (100uF read as 83uF; 2832 saw it as 90uF).
100nH read as 100.045 on the ST2832, and read as 180.321 on the TH2830.

--- End quote ---

This thread died down a bit but I was wondering if you were still running the ST2832 firmware?
And do you generally use that or are you sticking to the original firmware day to day and only using the other firmware to play around with?

Also it is bizarre that based on your data you posted above even the TH2830 original firmware seems to have some strange readings (100nH)
KungFuJosh:

--- Quote from: GnomeZA on December 14, 2023, 12:35:42 am ---
--- Quote from: KungFuJosh on July 24, 2023, 10:08:23 pm ---If somebody with a 2830 wants to test, the failures on mine were:
100uF was lower than expected (100uF read as 83uF; 2832 saw it as 90uF).
100nH read as 100.045 on the ST2832, and read as 180.321 on the TH2830.

--- End quote ---

This thread died down a bit but I was wondering if you were still running the ST2832 firmware?
And do you generally use that or are you sticking to the original firmware day to day and only using the other firmware to play around with?

Also it is bizarre that based on your data you posted above even the TH2830 original firmware seems to have some strange readings (100nH)

--- End quote ---

I do still run the ST2832 FW. It still has a couple bugs, but otherwise is excellent. I'm hoping ST acquires a new FW version and shares it, but it's been radio silence from them for a while. Understandable, since I didn't actually purchase from them.

Maybe somebody with an ST purchased device could reach out for newer firmware. 😉
GnomeZA:

--- Quote from: KungFuJosh on December 14, 2023, 01:05:55 am ---
--- Quote from: GnomeZA on December 14, 2023, 12:35:42 am ---
--- Quote from: KungFuJosh on July 24, 2023, 10:08:23 pm ---If somebody with a 2830 wants to test, the failures on mine were:
100uF was lower than expected (100uF read as 83uF; 2832 saw it as 90uF).
100nH read as 100.045 on the ST2832, and read as 180.321 on the TH2830.

--- End quote ---

This thread died down a bit but I was wondering if you were still running the ST2832 firmware?
And do you generally use that or are you sticking to the original firmware day to day and only using the other firmware to play around with?

Also it is bizarre that based on your data you posted above even the TH2830 original firmware seems to have some strange readings (100nH)

--- End quote ---

I do still run the ST2832 FW. It still has a couple bugs, but otherwise is excellent. I'm hoping ST acquires a new FW version and shares it, but it's been radio silence from them for a while. Understandable, since I didn't actually purchase from them.

Maybe somebody with an ST purchased device could reach out for newer firmware. 😉

--- End quote ---

I may have missed it in this thread, but where did you get the original TH2830 firmware? (and what was the date code)
I bought a TH2830 from AliExpress and it has firmware with date code "2022-05-31"
Any chance you could try get the latest from the Sourcetronic folks, or maybe you can tell me how exactly you asked them for it? (did you just email?)
I'm hesitant to do go backward in time in terms of firmware given your previous experience, not to mention bugs that have been (hopefully) been fixed
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