Keithley 708B 1 Slot Semiconductor Switching Mainframe

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.