Electronics > Metrology

A stable batt powered 1mA current source for measrmnt of 10k standard resistors

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zlymex:

--- Quote from: Vgkid on March 27, 2016, 06:25:03 am ---@ zlymex : What are those rotary switches?

--- End quote ---
I bought those second hand, no idea what they originally used for, rare to find.

quarks:

--- Quote from: zlymex on March 27, 2016, 07:34:54 am ---For current projects, I'll build my way up gradually. Actually I made an 100mA and an 1A current sources enable me to test small resistors in series, but there are some small issues need fixing. Then I'll do 10A, 30A and 100A. I made some tests on that 100A already and the results are very promising.

--- End quote ---

Looking forward to the higher amps.

To bad you were not active in this forum when my Metrology/ppm interest started

https://www.eevblog.com/forum/chat/help-wanted-low-and-high-ohm-measuremet/msg169139/#msg169139
https://www.eevblog.com/forum/chat/help-wanted-low-and-high-ohm-measuremet/msg184554/#msg184554
https://www.eevblog.com/forum/chat/help-wanted-low-and-high-ohm-measuremet/msg492031/#msg492031

dr.diesel:
Thanks zlymex, I look forward to your posts!

zlymex:

--- Quote from: quarks on March 27, 2016, 08:37:24 am ---
--- Quote from: zlymex on March 27, 2016, 07:34:54 am ---For current projects, I'll build my way up gradually. Actually I made an 100mA and an 1A current sources enable me to test small resistors in series, but there are some small issues need fixing. Then I'll do 10A, 30A and 100A. I made some tests on that 100A already and the results are very promising.

--- End quote ---

Looking forward to the higher amps.

To bad you were active in this forum when my Metrology/ppm interest started

https://www.eevblog.com/forum/chat/help-wanted-low-and-high-ohm-measuremet/msg169139/#msg169139
https://www.eevblog.com/forum/chat/help-wanted-low-and-high-ohm-measuremet/msg184554/#msg184554
https://www.eevblog.com/forum/chat/help-wanted-low-and-high-ohm-measuremet/msg492031/#msg492031

--- End quote ---
This thread looks very interesting. As a mater of fact, I bough a lot of low-ohm resistors such as VHP-4, PBV, RUG-Z, AE-PB roughly at the same time or even earlier.

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