Keithley 7111-S

The Keithley 7111-S is a low-voltage, quad 1×10 single-pole Form C multiplexer card for the 7001 and 7002 switch mainframes. It combines a screw terminal connector card and relay card into a single assembly, enabling direct wiring of external test circuits while delivering the low contact potential and minimal offset current required for sensitive measurements. Four independent multiplexer banks can be interconnected or isolated via jumpers, and the card reconfigures as two independent 1×10 two-pole banks when needed.

Technical Specifications

Multiplex Configuration: Four independent 1×10 single-pole Form C banks; configurable as two 1×10 two-pole banks

Connector Type: Screw terminals; accepts #16 AWG (0.092 inch O.D.) for up to 28 conductors per card, or #22 AWG (0.062 inch O.D.) for up to 88 conductors per card

Signal Levels: 110 V DC, 1 A switched, 30 VA (resistive); 125 V RMS and 175 V AC peak, 1 A switched, 60 VA (resistive)

Common Mode Voltage: 175 V peak, any pin to chassis

Contact Life: 10⁸ closures cold switching; 10⁵ closures at maximum signal levels

Channel Resistance: Less than 1 Ω per conductor

Contact Potential: Less than 500 nV per channel contact pair; less than 3 µV typical per single contact

Offset Current: Less than 100 pA

Actuation Time: 3 ms

Isolation (Bank): Greater than 10⁹ Ω, less than 25 pF

Isolation (Channel to Channel): Greater than 10⁹ Ω, less than 50 pF

Crosstalk (1 MHz, 50 Ω load): Less than –40 dB

Insertion Loss: Less than 0.1 dB below 1 MHz; less than 3 dB below 2 MHz (50 Ω source and load)

Relay Drive Current: 16 mA per relay

Key Features

Screw terminal design permits direct external wiring without adapters

Adjacent banks interconnect for expanded multiplexing configurations

Jumper-selectable bank isolation from backplane

Contact potential below 500 nV supports precision analog switching

Form C architecture enables simultaneous make-before-break transitions

Compatibility & Integration The 7111-S integrates directly with Keithley 7001 and 7002 mainframes via removable jumper connections to the analog backplane. Two cards cascade into a single 1×80 multiplexer through intercard backplane paths.