| Products > Test Equipment |
| TH2830 vs TH2832 |
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| KungFuJosh:
That's all great theory, but we've already shown in practice that the meters we're discussing here can in fact accurately measure 100KΩ at 100kHz and 200kHz. Those charts also point out that what I said is accurate. Using the correct test subjects at the correct test frequency was skipped. They only used a limited range of cap values that can be read in a broader frequency range. Most likely to reduce labor costs, or because whatever standard Tonghui was pretending to do didn't require anything beyond that. This gives a generalized result, without getting into more detailed specifics. Attached here is the chart from the Sourcetronic manual for the 283X models. |
| nctnico:
--- Quote from: KungFuJosh on July 09, 2023, 06:15:57 pm ---That's all great theory, but we've already shown in practice that the meters we're discussing here can in fact accurately measure 100KΩ at 100kHz and 200kHz. --- End quote --- Try to convince a calibration lab this statement is true. >:D In reality you have to be really careful to make claims about test equipment accuracy beyond the specification. It is better not to make such claims in order to prevent unpleasant surprises. The reason some values are not tested as part of the calibration is not due to laziness or saving work but to provide only meaningfull data. You can be sure that a 10k Ohm resistor measures within spec next year. Your 100k Ohm resistor may show an entirely different value... You won't be able to know for sure whether the resistor has changed or the meter has aged. |
| KungFuJosh:
--- Quote from: nctnico on July 09, 2023, 06:58:20 pm ---Try to convince a calibration lab this statement is true. >:D In reality you have to be really careful to make claims about test equipment accuracy beyond the specification. --- End quote --- Well, either way, we're talking about faulty firmware. The bad firmware had issues with 100KΩ across all the ranges. The closest measurements were actually in the 100kHz and 200kHz ranges. This isn't about discussing accuracy at those ranges in general. luudee's TH2832 did measure accurately in all ranges with his better firmware. Can you read that ridiculous chart I posted? What does it say for accuracy of 100kΩ at 100kHz? It looks like it should still be in the 0.1 to 0.2% range to me. That's not too crappy. |
| Martin72:
@nctnico: I think his first concern is why he gets a plausible value with the original firmware and not with the other two. Detached from the accuracy question. |
| KungFuJosh:
--- Quote from: Martin72 on July 09, 2023, 07:11:36 pm ---@nctnico: I think his first concern is why he gets a plausible value with the original firmware and not with the other two. Detached from the accuracy question. --- End quote --- You are correct. Either way, within the limits in the chart I posted above, 100kΩ at 100kHz should be within a 0.1 to 0.2% margin of error. 100kΩ at 200kHz should be within a 0.25 to 0.35% margin of error. Device limitations is certainly not the issue. |
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