Products > Test Equipment
TH2830 vs TH2832
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KungFuJosh:

--- Quote from: luudee on July 20, 2023, 01:56:21 am ---Hmm, looks like 200 KHz is still off ...

luudee

--- End quote ---

Yes, but overall significant improvement. When I do a full test we'll see how everything else is. 100KΩ accuracy isn't expected to be great at 200kHz, but that is worse than it should be.

What do 100KΩ measurements look like across the range with your TH2832?

Thanks,
Josh
luudee:

--- Quote from: KungFuJosh on July 20, 2023, 03:32:36 am ---
Yes, but overall significant improvement. When I do a full test we'll see how everything else is. 100KΩ accuracy isn't expected to be great at 200kHz, but that is worse than it should be.

What do 100KΩ measurements look like across the range with your TH2832?

Thanks,
Josh

--- End quote ---

Josh,

please look at post #165 ...

I will redo the tests. I am ordering some 0.1% resistors from mouser, 100 ohm, 10K, 100K, 499K & 1M

That should give a basic feel for it's performance ...

luudee
KungFuJosh:

--- Quote from: luudee on July 20, 2023, 04:12:50 am ---please look at post #165 ...

I will redo the tests. I am ordering some 0.1% resistors from mouser, 100 ohm, 10K, 100K, 499K & 1M

--- End quote ---

Oh yeah, that is much better.

I look forward to seeing the extended results.

Thanks,
Josh
mawyatt:
A simple RC model using the 200KHz value predicts a shunt C of ~2.14pF for the R, which seems large. This value C would produce a 100KHz reading of ~97.7K.

So it seems at 200KHz this is not utilizing a proper internal calibration value?

Agree, luudee's test should revel much!!

Also a quick look at the ratio of the 30 second and 1 hour warm up values across all frequencies and DC hints that the 200KHz range is suspect, only the 200KHz range has significant change!!

Best,
KungFuJosh:

--- Quote from: mawyatt on July 20, 2023, 01:37:52 pm ---So it seems at 200KHz this is not utilizing a proper internal calibration value?

--- End quote ---

My thoughts exactly. However, ST seems to think that there's only open/close correction, and no other means of adjustment. I don't know if that's true.

If there is a way to make adjustments, then that would be awesome. Figuring that out is another story.

There is manual open/close correction that can be done, but I assume that will get reset with ever new correction...and I don't remember if you can actually adjust the values. I'll mess with it.
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