The Keithley Instruments 7056 General Purpose Scanner Card is a plug-in switching module for Keithley scanner mainframes (Models 705, 706, 7001, 7002) that routes analog signals to measurement instruments. It operates as a configurable voltage scanner, relay card, or matrix with 10 channels in 2-pole mode or 20 channels in 1-pole mode. Each channel contains two Form A (SPNO) relays with less than 2 ms actuation time and contact life exceeding 10^8 closures at cold switching. Contact resistance stays below 2 Ω, while contact potential remains under 100 µV per pair with copper leads. The card supports maximum signal levels of 150 V, 250 mA, and 10 VA on resistive loads, with common mode voltage to 150 V peak. Channel isolation exceeds 10^9 Ω with less than 20 pF capacitance. External connections use quick-disconnect screw terminals (e.g., Model 7055) rated for #18 AWG wire. Offset current measures typically below 10^-13 A. The 7056 measures 272 mm × 114 mm × 32 mm and weighs 0.27 kg, operating from 0° to 50°C with storage capability to –25°C to 65°C. It complies with EU Directives 89/336/EEC (EMC) and 73/23/EEC (safety, EN61010-1/IEC 1010-1).
Technical Specifications
• Channels: 10 (2-pole mode) or 20 (1-pole mode)
• Relay Type: Form A (SPNO), 2-pole per channel
• Actuation Time: 10^8 closures (cold); >10^7 closures (maximum signal)
• Contact Resistance: <2 Ω to rated life
• Contact Potential: <100 µV per pair (typical 10^9 Ω, 10^9 Ω, 10^9 Ω, <150 pF typical
• Channel Crosstalk: <50 dB at 1 MHz into 50 Ω
• Offset Current: <10^-12 A (typical <10^-13 A)
• Connector: Screw terminal quick-disconnect card; max #18 AWG
• Dimensions: 272 mm × 114 mm × 32 mm; 0.27 kg
• Operating Temperature: 0° to 50°C (≤35°C at 70% RH)
• Storage Temperature: –25°C to 65°C
– Key Features
• Dual-mode operation: 10 channels (2-pole) or 20 channels (1-pole, HI/LO)
• Low contact potential (10^9 Ω) with minimal capacitive coupling
• Fast relay switching (10^8 cycles) under cold-switching conditions
• Guard connection for low-level differential measurements
– Typical Applications
• Automated test systems requiring multi-channel signal routing
• Data acquisition for voltage, current, and resistance measurements
• Matrix switching for complex test configurations
• High-impedance measurement applications
– Compatibility & Integration
Plugs directly into Keithley Models 705, 706, 7001, and 7002 scanner mainframes. Interfaces via Model 7055 quick-disconnect screw terminal card for simplified field connections and module swap.
