Pico ammeter


Posted on Jan 6, 2013

A very sensitive pico ammeter (— 1 V/pA) employs the amplifier in the inverting or current summing mode. Care must be taken to eliminate stray currents from flowing into the current summing mode. It takes approximately 5 for the circuit to stabilize to within 1% of its final output voltage after a step function of input current has been applied


Pico ammeter
Click here to download the full size of the above Circuit.

The internal diodes CR1 and CR2 together with external resistor Rl to protect the input stage of the amplifier from voltage transients.




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