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IanP said:Using instrumentation amplifiers you will have to build a constant current source in the following ranges:
100 Ω - .99999 kΩ 5 mA
1 kΩ - 9.9999 kΩ 250-500 µA
10 kΩ - 99.999 kΩ 50-80 µA
100 kΩ - 1100 kΩ 5-8 µA
1 MΩ - 9.9999 MΩ 0.5-0,8 µA
10 MΩ - 200 MΩ 50-80 nA
Again using instrumentation amplifier you will buffer test point(s) to directly read voltage. by a microcontroller with ADC (PIC).
For example 120MΩ at 50nA gives you 6V voltage reading..
IanP said:Using instrumentation amplifiers you will have to build a constant current source in the following ranges:
100 Ω - .99999 kΩ 5 mA
1 kΩ - 9.9999 kΩ 250-500 µA
10 kΩ - 99.999 kΩ 50-80 µA
100 kΩ - 1100 kΩ 5-8 µA
1 MΩ - 9.9999 MΩ 0.5-0,8 µA
10 MΩ - 200 MΩ 50-80 nA
Again using instrumentation amplifier you will buffer test point(s) to directly read voltage. by a microcontroller with ADC (PIC).
For example 120MΩ at 50nA gives you 6V voltage reading..