The Keithley 708 Single Slot Switching Matrix Mainframe is a compact signal routing platform for automated test and data acquisition systems. It accommodates a single interchangeable matrix card to build custom switching configurations, supporting up to 96 crosspoints (2-pole) with expansion to 480 via daisy-chaining. The 708B model controls an 8×12 matrix card and delivers significantly faster command-to-connect speed than earlier Series 700 mainframes, reducing test cycle times in high-speed measurement applications.
## Technical Specifications
**Switching Architecture**
• Single slot for matrix card installation
• 8×12 matrix configuration (708B): 96 crosspoints
• Daisy-chain expansion: up to 480 crosspoints across multiple units
• Non-volatile memory stores hundreds of switching configurations for instant recall
**Digital I/O (14 bits)**
• Open-drain architecture with configurable pull-up resistors
• Logic Low: 0.7V @ +850 µA max input
• Logic High: 2.1V @ +570 µA max input
• Source current: 960 µA max per bit
• Sink current: 5.0 mA max @ 0.7V (per bit); 600 mA max per channel
• Internal pull-up: 5V @ 65 mA
• External pull-up: up to 40V max
• Short-circuit protection to 25V DC
**Power & Relay Drive**
• Power consumption (708B): 110 VA max
• Relay drive (708B): 30W max per slot (6V @ 5.0A)
**Processing & Memory**
• Embedded Test Script Processor (TSP) with TSP-Link interface
• Test Script Builder (TSB) IDE for script development and debugging
## Key Features
• Command-to-connect speed optimized for rapid switching sequences
• TSP-Link integration with Keithley Series 2600A/2600B System SourceMeter instruments
• LXI Class C (v1.2) remote programming interface
• IEEE-488.1/488.2 GPIB compliance with optional USB-to-GPIB converter
• USB 2.0 Device (Type B) with USBTMC (Full and High Speed)
• 10/100 BaseT Ethernet with Auto-MDIX
## Typical Applications
• High-speed automated test systems requiring rapid channel switching
• Precision signal routing in multi-channel measurement setups
• Semiconductor characterization integration via GPIB
• Production test environments demanding configuration reusability
## Compatibility & Integration
• Compatible with plug-in cards designed for Keithley 707A and 708A mainframes
• Direct integration with Series 2600A/2600B System SourceMeter instruments
• Model 4200-SCS semiconductor characterization support via GPIB
