The Tektronix/Keithley 7067 Four-Wire Scanner Card is a 10-channel signal routing component for precision measurement systems. It employs four-wire (Kelvin) sensing to eliminate lead resistance errors in high-accuracy applications. Each channel contains 4-pole, single-throw normally open relays with dedicated source and sense contacts, enabling accurate resistance and voltage measurements across a wide range of test scenarios.
Technical Specifications
Channel Configuration
• 10 channels per card
• 4PST normally open relay architecture
• Two general-purpose source contacts and two high-quality sense contacts per channel
• Long-life reed relays throughout
Source Line Ratings
• Maximum signal: 150V, 350mA, 10VA (resistive loads)
• Contact resistance: <0.2Ω initial, <2Ω at rated life
• Contact potential: <50µV per contact pair
Sense Line Ratings
• Maximum signal: 150V, 100mA, 2VA (resistive loads)
• Contact resistance: <0.5Ω initial, <2Ω at rated life
• Contact potential: 10⁹ Ω, 10⁹ Ω, 10⁷ Ω, <150 pF
• Common-mode voltage: 300V peak
• Actuation time: 10⁸ closures (cold switching); >10⁶ closures (at maximum signal levels)
Thermal Characteristics
• Low thermal voltage offset error via contact potential specification
• 1-hour warm-up required for thermal stability
Connectors
• Quick disconnect terminal blocks and screw terminals
• Maximum wire size: #18 AWG
– Key Features
• Dedicated sense lines eliminate lead resistance from measurement accuracy calculations
• Ultra-low contact potential on sense contacts (<1µV) supports millivolt-level precision
• Extended contact life under cold switching conditions exceeds 100 million operations
• Dry voltage switching capability with high-quality sense contacts
– Typical Applications
• Four-wire resistance measurements (resistors, relays, connectors, switches, RTDs)
• Precision resistance testing and temperature coefficient characterization
• Bridge measurements and sensor excitation
• Remote sensing of voltage source outputs
– Compatibility & Integration
Integrates with Tektronix and Keithley automated test systems.
