Electronics > Metrology

Electron Plus SPA100 Source Picoammeter / High Resistance Meter

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MegaVolt:
Does anyone know what's inside it? Any pictures?
https://electron.plus/product/spa100-source-picoammeter
https://www.ebay.com/itm/124791936727

HighVoltage:
"<2fA resolution (200pA range)"

That is a bold claim especially on normal BNC cables.
Someone probably needs to buy one and perform a tear down.

Kosmic:
Just contact the owner of Electron Plus. He is a member of the forum. Username is fcb https://www.eevblog.com/forum/profile/?u=25995

fcb:
Fairly 'standard' transimpedance amplifier design with careful layout that's gone through a couple of iterations, lots of slots in PCB's etc..

The front-end and the bias generator are isolated with a transformer and opto-couplers.

We are updating our website at the moment (as well as manuals/datasheets/etc...) , so the picture is a little out-of-date, most of our products now have a label on-top and all have stainless steel front & rear panels.  Here's a picture courtesy of our US distributor, Saelig.

MegaVolt:

--- Quote from: fcb on November 26, 2021, 08:48:21 pm ---Fairly 'standard' transimpedance amplifier design with careful layout that's gone through a couple of iterations, lots of slots in PCB's etc..
--- End quote ---
Perhaps you can answer some questions?
1. BNC instead of triax? Why did you decide not to use them?
2. What was the noise level on the lower range?
3. Any pictures inside?

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