Keithley 2559 Error in Low Meas free download

File name 2559 Error in Low Meas.pdf

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