The Keithley 6521 is a Two optional 10-channel plug-in scanner card available to extend the measurement performance of the Model 6517B Electrometer/High Resistance Meter. The cards install directly into the option slot in the back panel of the Model 6517B. The cards are also compatible with the Keithley6517A and 6517

The Keithley 6521 Low Current Scanner Card is a 10-channel multiplexer, designed for switching low currents in multipoint testing applications or when the test configuration must be changed. The offset current on each channel is <1pA and high isolation is maintained between each channel (>10 15 Ω). The Model 6521 maintains the current path even when the channel is deselected, making it a true current switch. BNC input connectors help provide shielding for sensitive measurements and make the card compatible with low-noise coaxial cables. The Model 6521 is well suited for automating reverse leakage tests on semiconductor junctions or gate leakage tests on FETs.

The Keithley 6522 Voltage/Low Current Scanner Card can provide up to ten channels of low-level current, high impedance voltage, high resistance, or charge switching. Although it is similar to the Model 6521 in many ways, the Model 6522’s input connectors are 3-lug Triax. The card can be software configured for high-impedance voltage switching of up to 200V. Triaxial connectors make it possible to float the card 500V above ground and drive the guard to 200V.