What we were overcharged for to do pico-amp level measurements in a lab setting.
* CN2 on the first photo was “rated” to 1pA. * TIA*x* on the second photo was also “specified” to <1pA. * The switch connections and coax on the third photo was also meant to switch 1pA signals.
None of those things performed – the leakage was way too high here, unsurprisingly!
What we were overcharged for to do pico-amp level measurements in a lab setting.
* CN2 on the first photo was “rated” to 1pA.
* TIA*x* on the second photo was also “specified” to <1pA.
* The switch connections and coax on the third photo was also meant to switch 1pA signals.
None of those things performed – the leakage was way too high here, unsurprisingly!
Who soldered that? Frosty the Snowman? [This guy?](https://www.hamsexy.com/cms/?p=1267)
edit: that last link is 8 years old. I expect that he’s grown up and matured. Don’t give him the gears, eh?
Heh, soldering aside, where’s the guard trace or trace clearance on the PCB?