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Bench multimeter

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mawyatt:
Yeah, think this is a little different than "Enabling" a SDS2000X+, SDG2042X, or SDP3303X, since apparently there are some hardware differences between the SDM3045 and 3055.

Even if it's "just" the voltage reference and some resistors; precision, stable references and resistors can get expensive, and real precision, gets real expensive, real quick :o

Best,

zepto:

--- Quote from: Joop01 on June 25, 2023, 08:39:40 pm ---Which brand depends greatly on what you want to measure. I'm busy with sound/audio and in that area Siglent is not the brand to have. Not mentioned in the specs is the input resistance which is going down with climbing frequency. With 10kHz already 160kOhm. That will introduce a big error. You can find this somewhere in the back of the manual, but not in the datasheet.

--- End quote ---

You might find this in the back of a 34401a manual as well.

I like some of the offerings from Siglent and Rigol, but I have never considered purchasing any of their multimeters (or power supplies). Too many great 5.5/6.5+ meters were produced in the last 30 years to warrant buying new as a hobbyist.

KungFuJosh:

--- Quote from: mawyatt on June 26, 2023, 01:36:52 am ---Yeah, think this is a little different than "Enabling" a SDS2000X+, SDG2042X, or SDP3303X, since apparently there are some hardware differences between the SDM3045 and 3055.

Even if it's "just" the voltage reference and some resistors; precision, stable references and resistors can get expensive, and real precision, gets real expensive, real quick :o

Best,

--- End quote ---

SDM3055 and SDM3055X-E are two different models. SDM3055X-E is identical hardware to SDM3045X. The SDM3045X is crippled by the firmware, and swapping model firmware gives you the full 5.5 digits / 240,000 counts. There are a couple small hardware improvements for the SDM3055 version, but the question is if that's worth the extra $$ to the OP.

I've been running the SDM3055X-E firmware on my SDM3045X for over a month with no issues. 5.5 digits, and no issues with the calibration or accuracy.

Thanks,
Josh

tautech:

--- Quote from: mawyatt on June 26, 2023, 01:36:52 am ---Yeah, think this is a little different than "Enabling" a SDS2000X+, SDG2042X, or SDP3303X, since apparently there are some hardware differences between the SDM3045 and 3055.

--- End quote ---
For western models yes, however we have proved a long standing hunch I had that western SDM3045X = eastern SDM3055X-E HW and only the SW/product ID is different.

Study of the thread linked earlier by KungFuJosh reveals the issues western SDM3045X has with ranging whereas eastern SDM3055X-E doesn't have such issues due to how the SW/OS has it operate....yet it's the same HW !
One only has to study/compare datasheets of SDM3045X and SDM3055X-E to see SDM3045X is a bit of an oddball with different measurement ranges to the other 2 western SDM3k models.....yet eastern SDM3055X-E has those same 2,20,200 range steps too.

Anding:
Thank you all.  I learned a lot from these replies.  I will be placing an order for the SDM3055

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