Products > Test Equipment

TH2830 vs TH2832

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mawyatt:
Been following this, nice work tv84 and Josh :-+

Were you able to get 200KHz? Also down to 20Hz?

The calibration is questionable, I guess you could make some measurements with the 2832 enabled, then revert back to the 2830 and see if they agree. You have a SMD fixture like we have, that would be a good way to do the capacitor comparisons, some quality COG/NPO caps might be worthwhile, even some good 0.1% low TC chip resistors. The Tonghui supplied Kelvin clips are pretty good, altho likely more chance of variability than the SMD fixture for caps.

One thing that just occurred is if you should do a recalibration of the Open and Short if you change back to the 2830 to verify a given set of measurements. Since apparently there isn't any physical changes, leaving the Short/Open cal alone might give a more "repeatable" result between firmware changes?

Anyway, nice safe cracking :)

Best,

 

KungFuJosh:

--- Quote from: mawyatt on July 01, 2023, 11:28:14 pm ---Been following this, nice work tv84 and Josh :-+

--- End quote ---
That was mostly tv84's skill, nctnico's insight, and me willing to screw my meter up. 😉


--- Quote ---Were you able to get 200KHz? Also down to 20Hz?

--- End quote ---
Yes, full range in tiny steps if you want. I posted the 20Hz/20kHz screenshots previously. Also the DC bias voltage, and the DCR test voltage is also adjustable now. Instead of DCR test voltage being stuck at 1V, it can be anywhere from 50mV to 2V.


--- Quote ---The calibration is questionable, I guess you could make some measurements with the 2832 enabled, then revert back to the 2830 and see if they agree. You have a SMD fixture like we have, that would be a good way to do the capacitor comparisons, some quality COG/NPO caps might be worthwhile, even some good 0.1% low TC chip resistors. The Tonghui supplied Kelvin clips are pretty good, altho likely more chance of variability than the SMD fixture for caps.

One thing that just occurred is if you should do a recalibration of the Open and Short if you change back to the 2830 to verify a given set of measurements. Since apparently there isn't any physical changes, leaving the Short/Open cal alone might give a more "repeatable" result between firmware changes?

--- End quote ---

I do like the idea of getting use out of the SMD fixture. However, it is mildly tedious switching back and forth between firmwares because all of the memory based settings are lost when switching between the two models.

My guess is that the short/open cal will also be lost, but I can do a test before and after running the corrections on the 2nd fw. My other guess is that if my cal data was lost, it likely won't exist for either fw anymore. I'll see how accurately those SMD toys test, and also compare with my ST42.

I added stuff for testing to my Mouser cart:



Edit: My previous cap tests weren't with the kelvin leads, I used the 26048A fixture. However, none of them were precision caps, and I kept them in a closed zip lock bag, so I assume not ideal.

mawyatt:
Oops, forgot about Nick, so thanks to Nick as well :-+

Think a 1206 or 0805 NPO/COG caps of 1000, 100 and 10pF might be good for some verification between firmware changes. Polystyrene & Mica are another very stable capacitor type, if you can find some (Surplus Sales Nebraska).

Anyway, well done by you, tv84 and Nick ;)

Best,

KungFuJosh:

--- Quote from: mawyatt on July 02, 2023, 01:39:34 am ---Oops, forgot about Nick, so thanks to Nick as well :-+

--- End quote ---
And Rudi too for that matter. Without his photos and stuff, this likely wouldn't have happened at all.


--- Quote ---Think a 1206 or 0805 NPO/COG caps of 1000, 100 and 10pF might be good for some verification between firmware changes. Polystyrene & Mica are another very stable capacitor type, if you can find some (Surplus Sales Nebraska).

--- End quote ---
I have polystyrene and mica caps. I updated my mouser cart with more SMD crap. 😉

mawyatt:
Ok, thanks to Rudi too :-+

Another possible issue could be, does the TH2830 have factory calibration parameters for the "extra" frequency ranges that come with the TH2832?

Best,

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