Keithley

Keithley 6517A Electrometer High Resistance Meter. The half-rack-sized Model 6517A has a special low current input amplifier with an input bias current of 0.75fA p-p (peak-to-peak) noise and on the lowest range. The input impedance for voltage and resistance measurements is 200TΩfor near-ideal circuit loading. These specifications ensure the accuracy and sensitivity needed for accurate low current and high-impedance voltage, resistance, and charge measurements in areas of research such as physics, optics, nanotechnology, and materials science.