The Keithley 7164/7164-M is a 20-channel scanner card for integrating with Keithley data acquisition systems and mainframes. It routes multiple signals to a single measurement instrument—such as a multimeter or source meter—enabling efficient automated test setups and data logging. The 7164-M variant employs mercury wetted reed relays for superior contact performance and signal integrity across demanding measurement applications.
## Technical Specifications
**Channel Configuration & Contacts**
• 20 channels in 2-pole Form A configuration
• Common guard/shield connection per channel
• Mercury wetted reed relays (7164-M)
• Contact resistance: less than 1Ω at end of life
• Contact potential: less than ±500nV typical per contact; 1µV maximum
**Relay Signal Ratings**
• DC: 110V DC, 1A switched, 30VA maximum (resistive load)
• AC: 125V AC rms or 175V AC peak, 100kHz maximum, 1A switched, 62.5VA maximum (resistive load)
• Contact life: greater than 10⁵ operations at maximum signal level; greater than 10⁸ operations cold switching
• Actuation time: 2.5ms maximum on/off
**Input Characteristics**
• Connector: Screw terminal, #22 AWG wire
• Isolation between any two terminals: greater than 10⁹Ω, less than 75pF
• Isolation between any terminal and earth: greater than 10⁹Ω, less than 150pF
• Common mode voltage: 350V peak between any terminal and earth
• Maximum voltage between any two terminals: 110V DC, 125V AC rms
## Key Features
• Mercury wetted reed relays deliver low contact potential for precision measurements
• Cold switching rated to 10⁸ operations ensures extended operational life
• Screw terminal connectors accept #22 AWG conductors for field wiring
• Superior isolation characteristics minimize crosstalk in multi-channel measurement configurations
• Form A relay configuration provides straightforward two-pole switching architecture
## Typical Applications
• Multi-channel DC and AC signal routing to digital multimeters
• Source meter multiplexing in automated parametric test systems
• Data acquisition switching matrices for environmental chamber testing
• Precision measurement instrument signal distribution
## Compatibility & Integration
Designed for Keithley data acquisition systems and mainframes. Verify specific mainframe compatibility based on system requirements. Physical dimensions: 21mm H × 72mm W × 221mm D.
