Electronics > Projects, Designs, and Technical Stuff
Looking for ideas to DIY uA Meter (shunt amplifier)
<< < (5/6) > >>
Kleinstein:
If one really needs the high BW one would need a rather fast AZ-OPs, so maybe ADA4522 or OPA189 or MCP6V81.  These have quite some bias and also a little offset, that is however at least constant. For a lower BW version one could start with something like AD8551 or MCP6V27.

It also depends a lot on what to do with the result and what supply is available.
_Wim_:

--- Quote from: Kleinstein on December 14, 2018, 05:23:17 pm ---If one really needs the high BW one would need a rather fast AZ-OPs, so maybe ADA4522 or OPA189 or MCP6V81. 
--- End quote ---

If the stated 100kHz bandwith is needed also in the 100x mode, you need at least a GBW of 10MHz. The OPA189 seems than the best solution of the above
chickenHeadKnob:



--- Quote ---
What do You mean?
It will be Ok to clone uCurrent?
Why Dave discontinued it?

--- End quote ---

Dave made it open hardware, he explicitly encourages those who want to make there own to do so.
MiroS:
If you want to buy something that can be a good decision, they are very affordable, listed below are just exapmles , thay can be found cheaper than on  below list:

1. V640: lowest range is 150 nA (so lowest will be 5/10nA) and goes up to 1A
https://allegro.pl/oferta/multimetr-meratronik-v640-meratester-plomba-etui-7717926835

2. U726: lowest range is 1nA so lowest  value will be  ca. 20pA
https://allegro.pl/oferta/przyrzad-electronic-voltmeter-u726-meratronik-7665682869

3. U722: lowest range is 1nA so lowest  value will be ca. 20pA
https://allegro.pl/przyrzad-woltomierz-u722a-meratronik-voltmeter-i7688063688.html

Thay are very old, but usually working well , aligement is very simple, schema availbe online.

Display is analog, but they have also analaog output , for every range it will be 0-1V or somethng like that. That way you can  have digital output as well on every other multimeter capable measuring volts.

001:

--- Quote from: MiroS on December 15, 2018, 12:23:08 pm --- -

--- End quote ---

Thanx
But I see what burden voltage is high, isnt it?
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod