Electronics > Metrology

Measuring nanoamps and below like a Ninja

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About GLIN v.2:
Still in progress... Output PCB ready(LPF + programmable amplifier + protection circuits), digital PCB and front panel arrived.

Local PCB factory delivered today last PCBs and stencils.
Internal power source updated to tantalum capacitors.
In this weekend must be delivered these tantalum capacitors and i hope to assembly all PCBs together :popcorn:

For attoamps Ninja: Low current reference of VNIIFTRI Metrology institute, 1976y.


A.M.Ilukovich "Technique of electrometry"
© Energiya Publishing house, 1976.
Pages 262-263

UPD: "Indirect method" shows into V7-45 performance verification procedure:
On subranges 10-10...10-14A use the differentiator D1 of the EK1-6 calibrator, and on subrange 10-15A - the differentiator D3.

As in the differentiator D3 the so-called non-stationary differentiating capacitor, is used by electrode of the output of the differentiator and the input electrode of the V7-45 voltmeter, the differentiator D3 demands preliminary calibration.

To carry out calibration of the differentiator D3 in the following sequence:
1 - check the indication of the V7-45 voltmeter on the subrange 10-14A, giving from the EK1-6 calibrator via the differentiator D1 current 10-14A.
2 - Replace the differentiator D1 with the differentiator D3 and repeat check on the subrange 10-14A, giving current from the calibrator to EK1-6 of the 9.999∙10-15. Rotation of the axis "CALIBRE" resistor on the differentiator D3 to achieve that indications of the V7-45 voltmeter in both cases did not differ more, than for the 1%.
Then to pass to check of the error of measurement on subrange 10-15A. To set controlled current and high-speed performance according to tab. 9.4.
It very similar to VNIIFTRI method, except small changes. That means, UUT must be tested on point 10-14A with classic "stationary dual electrode capacitor". After that directly on input installs non-stationary differentiating capacitor, and tuned on highest ramp speed x10 exactly to same current 10-14A. It means non-stationary differentiating capacitor tuned as closer as possible to:
After that ramp speed is slow down to normal value, and performance verification of range 10-15A and less can be started.

     I noticed that the Russian word for voltage has been translated into 'tension'.  I've seen the same in other documents (google-)translated from Chinese.  I found that amusing, as the German word for both tension and voltage is 'Spannung'.


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