Zero Resistance amp meter

Thread Starter

vortexflow

Joined Feb 16, 2009
4
I am trying to figure out the schematics for a zero resistance ampmeter. I cant used a shunt or a clamp type meter since I am measuring no more than 15 mA. and the circuit is an electrochemical cell so if i use any other meter than a (ZRA) I will be playing chicken between voltage value and current generated. I got as far as figuring out that I need an ADC and an OP amp for the circuit. I would appreciate any help on this matter.
thanks
 

KL7AJ

Joined Nov 4, 2008
2,229
I am trying to figure out the schematics for a zero resistance ampmeter. I cant used a shunt or a clamp type meter since I am measuring no more than 15 mA. and the circuit is an electrochemical cell so if i use any other meter than a (ZRA) I will be playing chicken between voltage value and current generated. I got as far as figuring out that I need an ADC and an OP amp for the circuit. I would appreciate any help on this matter.
thanks
What you want is a transimpedance amplifier.

From the master:

http://electronicdesign.com/Articles/Index.cfm?AD=1&ArticleID=4346
 
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