Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley Appnotes 2559 Error in Low Meas

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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 

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