Products > Test Equipment

Keithley 2100,2000, etc or Chinese bench multimeters?

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nctnico:
Well, you don't learn how to make samurai swords in one day. It takes decades of training and devotion.

BTW: do you have a good enough reference to back the claim that your SDM3065X has excellent stability? You'd need some really sophisticated gear to determine stability for a 6.5 digit DMM.  ;) In general most people / labs don't. You'd need a metrology grade voltage standard.

Martin72:
I bought a handful of SDM3045Xs for “my” test field. We don't need more than 3 decimal places of accuracy and as long as the annual external calibration “says” that the Siglent meets its own specifications, everything is fine.
The same applies to my private SDM3065X.

KungFuJosh:

--- Quote from: nctnico on October 28, 2024, 10:26:46 pm ---Well, you don't learn how to make samurai swords in one day. It takes decades of training and devotion.

--- End quote ---

Ha! That's a silly analogy. Making swords is a significantly higher level skillset. I have no experience selecting or aging ref chips, but I'm sure if I was working with somebody who was experienced, I'd be fine, and refer to them for confirmation. Electronics = measurable specs. Sword making is an art that takes hundreds or thousands of hours to be mediocre at. 😉


--- Quote from: nctnico on October 28, 2024, 10:26:46 pm ---BTW: do you have a good enough reference to back the claim that your SDM3065X has excellent stability? You'd need some really sophisticated gear to determine stability for a 6.5 digit DMM.  ;) In general most people / labs don't. You'd need a metrology grade voltage standard.

--- End quote ---

Absolutely! For my needs. Actually, for better than my needs. 🤣

I tested with a VREF10-001 r9 and posted the results from TestController in the Siglent DMM thread. I also shared the results with Doug (the maker of the VREF) and he was impressed with the Siglent's performance, and said the noise seen in the results is right on with the specs of the reference chip itself.

Thanks,
Josh

coromonadalix:
for the based lm399  ltz 1000 and such,  aging will make them better and less drifty ...

i had proof of that  with oldies like 34401a  and their replacement L4411a and 34410a,  theses later where as good ...

even old Keithley 196 and Tek DM5120  based on lm399  where darn good too,  but 300 volts, not 1kv

surely  other in the k2xxx series would be as good

I'm not bashing Siglent or others   but ...  they will age in a sense ... all electronics do age,   but temp controlled zenner will stabilize over time

but now  all comments including mine are derailing the @op thread,  he'll decide whats best for him,  not us  loll



Now other brands tries to get the best bang for the buck,  but some  will never be as good as the past or actual main actors  ...  see the top end 8.5 digits

Nothing as really changed over the years,  just some black"ish"  phenomenon 

Fluke / Wavetek, Advantest, Keysight, Keithley,  Datron, Prema, Solartron   ...  some of them haven't got any successor or extended models,  just a black 3458a  ... 
Or the ones we find on fleabay, that can be repaired and saved ...

Now there is the new REF xxx series   who seem's good, pretty good ?, well see how they evolve ...

KungFuJosh:
I just watched the rest of Tony's video. The Siglent was not warmed up in Tony's video, but it was more accurate according to the outdated cal sheet. 😉 Then I watched a couple reviews of the DMM6500.

Now I'm even more interested to see the SDM4065A when it comes out.

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