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Technical Low Current/High Resistance Information Measurements An ammeter is an instrument for measuring electric of the DUT. A shunt ammeter's voltage burden is typi- lower measured emitter current than intended. If a current flow, calibrated in amperes. There are two cally on the order of hundreds of millivolts. picoammeter or electrometer were used instead, the main types of ammeter architectures: shunt amme- voltage burden would cause a negligible change in Technical information: Low current/high resistance measurements ters and feedback ammeters. Picoammeter/Electrometer emitter current. Shunt vs. Feedback Ammeters Sources of Generated Current Error