Keithley 7037-D 30-Channel Digital I/O Card

The Keithley 7037-D is a 30-channel digital I/O card designed for integration into automated test and measurement systems. It combines single-pole relay switching with independent digital inputs and outputs, delivering versatile signal routing and control for complex test environments. The card accommodates 30 independent 1-pole Form A relay channels alongside 10 digital inputs and 10 digital outputs, all accessible through two heavy-duty 50-pin D-sub connectors rated for frequent industrial connections. ## Technical Specifications Relay Switching • 30 independent channels, 1-pole Form A configuration • Maximum signal: 110V DC, 110V rms, 155V peak (between any two inputs or chassis) • Switched current: 1A; power rating: 30VA (resistive load) • Channel resistance: <1.25Ω per conductor • Contact potential: <4µV per contact • Offset current: 10⁹Ω, 10⁹Ω, <100pF • Crosstalk at 1MHz, 50Ω load: <−40dB • Insertion loss: <0.25dB below 1MHz, <3dB below 10MHz • Relay drive current: 16mA per relay Digital I/O • 10 independent outputs: open-collector drivers with internal 10kΩ pull-up resistors and flyback diodes • Output pull-up voltage: 5V internally supplied; external connection available up to 42V maximum • Output short circuit protection: up to 25V • Maximum sink current: 250mA per channel, 1A per card • Configurable negative or positive true logic • 10 independent inputs with configurable 10kΩ pull-up or pull-down resistors • Maximum input voltage: 42V peak • Input logic: positive true ## Key Features • Heavy-duty 50-pin D-sub connectors for industrial production environments • Hardware-configurable digital I/O logic levels • Flyback diode protection on output drivers • Low contact resistance and minimal crosstalk for signal integrity ## Typical Applications Portable device testing, automated test setups, multi-channel signal routing, equipment control with external device monitoring. ## Compatibility & Integration Compatible with Keithley 7001 and 7002 switch mainframes, as well as other 7XXX series cards.