TH2830 vs TH2832

[GnomeZA]

"Today" I got the new firmware for our ST2830 from Sourcetronic (the guy asked me if I knew about the new firmware through a certain "Josh"...  ).
I then asked again what exactly had been changed, the question was passed on and I may get an answer soon (which I will then post here).
This is interesting because I have to pay attention to the calibration.

Any chance you could also share this ST2830 firmware Martin?
I think having both is not per-se a bad thing

[Martin72]

Hi,
No problem - tomorrow..

[Martin72]

A little late, but not forgotten...

https://drive.google.com/file/d/1VnfhRBVc8n2ndyWcnriZIla9GFPnQXkD/view?usp=sharing

[KungFuJosh]

One of my contacts at Sourcetronic was kind enough to share how to do the Dissipation Factor test. He said:

For the D test, Cs-D fundamentally has the same information as Cs-Rs, as the loss factor is directly connected to the ESR Rs.
That also means that you can fake the D by putting actual resistors in series to the capacitor, and you get different sizes of D depending on the resistance you put up.

So I tried it out, and it works. I threw different value resistors in series, and it gave DF values similar to what was expected using math (eww, gross)...just kidding, I used a calculator. 🤣

Measured Rs of the cap was about 29Ω at 1kHz. So using some standard R values, I can do something like this:
29Ω = 0.00018 (cap only)
79Ω = 0.00049 (29Ω + 50Ω)
162Ω = 0.00101 (29Ω + 133Ω)
797Ω = 0.00506 (29Ω + 768Ω)
1609Ω = 0.01010 (29Ω + 1.58k)
16029Ω = 0.10071 (29Ω + 16k)
160029Ω = 1.00530 (29Ω + 160k)

I'm sure those numbers aren't perfectly accurate, but they should be close enough to test it on a new test board. 😉

Thanks,
Josh

PS. Abbreviating Dissipation or Dissipation Factor as just D, leaves some hilarious statements out of context.

[KungFuJosh]

Here's an update on the Dissipation Factor test values.

Tested at 1kHz:
1nF cap (no series resistor) -> 0.00010
50Ω (actually 49.9) -> 0.00050
133Ω -> 0.00100
768Ω -> 0.00500
1.58 kΩ -> 0.01000
16 kΩ -> 0.10000
160 kΩ -> 1.00000

Those values are pretty spot on for the cap I used. I used Panasonic 0.1% 25ppm SMT resistors.

Thanks,
Josh