The Keithley 708B is a single-slot semiconductor switch matrix mainframe that controls up to 96 crosspoints through a single 8×12 matrix card. Designed for high-speed switching in laboratory and production test environments, it delivers command execution in as little as 1.9 ms and trigger-to-trigger response under 0.5 μs. The instrument stores hundreds of switching configurations in non-volatile memory and supports both manual front-panel operation and remote control via LXI Class C, USB, and GPIB interfaces.
## Technical Specifications
• **Matrix Capacity:** Single 8×12 matrix card; up to 96 crosspoints
• **Command Execution Speed:** 1.9 ms to 20.5 ms depending on interface and card type
• **Trigger Performance:** ≤0.5 μs (trigger in to trigger out); ≤85 μs (trigger in to matrix ready pulse in DDC mode)
• **Maximum Trigger Rate:** 65 to 160 scan steps per second depending on card
• **Digital I/O:** 14 bits open drain; 25-pin female D connector
• **Digital I/O Voltage Limits:** −0.25 V to 5.25 V absolute; 0.7 V max logic low; 2.1 V max logic high
• **Digital I/O Current:** 960 μA source max; 5.0 mA sink max @ 0.7 V
• **Relay Drive:** 30 W maximum (6 V at 5.0 A)
• **Power Supply:** 100–240 VAC, 50–60 Hz; 110 VA maximum
• **5V Digital I/O Supply:** 600 mA maximum
## Key Features
• Embedded TSP® processor with TSP-Link® interface for integration with Series 2600A/2600B System SourceMeter® instruments
• 707A/708A Device Dependent Commands (DDC) emulation for direct migration from legacy systems
• Keithley Test Script Builder (TSB) Integrated Development Environment support
• Non-volatile memory stores hundreds of matrix configurations and channel patterns
• Compatible with plug-in cards designed for 707A/708A mainframes
## Compatibility & Integration
The 708B accepts popular switching matrix cards including the 7072, 7072-HV, 7173-50, and 7174A, with execution speeds optimized for each card type across Ethernet, GPIB, USB, and TSP-Link control interfaces.
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