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.
