Hi,
SDM3055.
It meets your spec.
Absolutely enough.
At 200 uA range accuracy is 0.055 + 0.005 (% of measurement + % of range). At 200.000 display precision and 1 uA measurement, it means +/- 0.010
(55) overall precision, which is one whole digit better than the requested 1 uA significant precision.
I'll make some deeper research on PC-log/-trend side early next week.
Who are the calibration providers in Hungary?
Maybe if you contact Siglent in Hamburg they can tell you some they are already using.
There are a lot of providers with different equipment and different services. Most of my devices are way within the 2-year period and haven't yet made a whole market research for the possibilities (I have only Rigol, but switched one supplier to another recently, and the new one have some in-house calibration offer -- but I do not know anything about it yet). So, there is a wide range of possibilities. The big question is availability and price. My above mentions about Rigol is about the old supplier so it may be better with the new one.
I am very thankful for your answer and your suggestion too. This is still a learning curve for me. If you may have some time, I may be very pleased, if you could write a few lines about my current idea. So,
what if I...
- expand the DCI limit down to the nA range with 10 nA significant precision,
- expand to 6 1/2 digits,
- doubles the budget up to the €900–1000 range,
- simply forget the “dual measurement of U and I” idea for practical reasons,
- and say/guess that a Kithley DMM6500 may be a good/best choice?
https://www.tek.com/tektronix-and-keithley-digital-multimeter/dmm6500The only relevant limitation is capacitance measurement (too small range), but extra features like capturing live signals with 1 MS/s may be extremely useful for my main development goals (ultra low-power IoT). This is what I was going to make on the PC-side. And, finally, as far as I know, Siglent and Tektronics/Kithley are in two different leagues.
Thanks in advance.
Tamás