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A G R E AT E R M E A S U R E O F C O N F I D E N C E

Problem: Error in Low
Voltage, Low Current
Measurements
Potential Cause: Voltage Burden voltage drop of 0.7V. Assuming that the Remedy
One of the biggest sources of error in source resistance is 10k and the voltage Electrometers and picoammeters, be-
measuring low currents from low voltage burden is 200mV, then the current through cause of their feedback design, have very
sources is voltage burden. Unlike an ideal the meter will be: low voltage burdens--typically in the tens
ammeter, a shunt style ammeter (for ex- to hundreds of microvolts. If a picoammeter
0.7V