Keithley 480 Picoammeter

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The Model 480 is a 3½ digit Picoammeter that provides seven decade current ranges from 10-9 to 10 -3 ampere, with 100% overranging on all ranges. The instrument features include an input voltage burden of ≤ 200V, front panel zero check and adjustment, an analog output and automatic polarity indication of the input current.