twotaileddemon
Mar7-11, 09:26 AM
1. The problem statement, all variables and given/known data
How does a picoammeter work? I know it can measure small currents, but how is it different from the design of an ammeter and why can it measure small currents?
2. Relevant equations
Q = CV = CIR
I = Q/(RC)
3. The attempt at a solution
For example, the circuit within a particular picoammeter from tel-atomic can be simplified capacitor of .001 microfarads in parallel with a resistor which is in parallel to an amplifier.
I'm confused because it looks like the current would be inversely proportional to the capacitance, which is pretty small, so the current would be large.
How does a picoammeter work? I know it can measure small currents, but how is it different from the design of an ammeter and why can it measure small currents?
2. Relevant equations
Q = CV = CIR
I = Q/(RC)
3. The attempt at a solution
For example, the circuit within a particular picoammeter from tel-atomic can be simplified capacitor of .001 microfarads in parallel with a resistor which is in parallel to an amplifier.
I'm confused because it looks like the current would be inversely proportional to the capacitance, which is pretty small, so the current would be large.