Features Cost-effective low current measurement solution 10fA resolution 5-1/2 digit resolution <200μV burden voltage Up to 1000 readings/second Built-in Model 485 emulation mode IEEE-488 and RS-232 interfaces Analog output The 5-1/2 digit Model 6485 Picoammeter combines Keithley's expertise in sensitive current measurement instrumentation with enhanced speed and a robust design. With eight current measurement ranges and high speed autoranging, this cost-effective instrument can measure currents from 20fA to 20mA, taking measurements at speeds up to 1000 readings per second.