The Keithley 7071-4 is a Dual 4×12 General Purpose Matrix Card that expands the switching capabilities of Keithley 707A and 708A mainframes. This card enables column expansion up to 720 columns across five 707A mainframes through two independent banks of four signal paths. The matrix configuration supports Dual 4×12, 8×12, or 4×24 arrangements via removable jumpers for segment isolation or reconfiguration. Each crosspoint features 3-pole Form A switching (HI, LO, GUARD) with screw terminals on rows and quick-disconnect 38-pin connectors for column connections.
## Technical Specifications
• **Matrix Configuration:** Dual 4 rows × 12 columns; configurable as 8 rows × 12 columns or 4 rows × 24 columns
• **Crosspoint Type:** 3-pole Form A (HI, LO, GUARD)
• **Maximum Signal Level:** 200 V, 1 A carry / 0.5 A switched, 10 VA peak (resistive load)
• **Common Mode Voltage:** 200 V maximum between any 2 pins or chassis
• **Contact Life:** 10⁸ closures (cold switching); 10⁵ closures (at maximum signal level)
• **Path Resistance:** <0.6 Ω initial; <1.5 Ω at end of contact life
• **Contact Potential:** <5 µV per crosspoint (HI to LO, <1 minute after actuation)
• **Offset Current:** 10¹⁰ Ω with <10 pF; Differential 10¹² Ω, 45 pF nominal; Common Mode 10¹² Ω, 300 pF nominal
• **Crosstalk:** <–45 dB at 1 MHz, 50 Ω load
• **Insertion Loss:** 0.1 dB typical (1 MHz, 50 Ω source, 50 Ω load)
• **3 dB Bandwidth:** 5 MHz typical (50 Ω load)
• **Relay Settling Time:** <3 msec
• **Relay Drive Current:** 15 mA per crosspoint
• **Operating Temperature:** 0° to 50°C (up to 35°C at 70% R.H.)
• **Storage Temperature:** –25° to 65°C
## Key Features
• Quick-disconnect 38-pin connectors for column connections; screw terminals on rows
• Jumper-configurable architecture for custom matrix topologies
• Two mass-terminated cable options (1.5 m and 6 m lengths) with shielded twisted pair construction for noise immunity
• Bulkhead mount receptacle available for panel integration
• Conforms to EU Directive 89/336/EEC (EMC) and 73/23/EEC (Safety, EN61010-1/IEC 1010)
## Typical Applications
General-purpose signal routing and switching in automated test environments requiring multi-channel matrix expansion and low-noise analog signal paths.
## Compatibility & Integration
• **Mainframes:** Keithley 707A, 708A
• **Accessories:** Model 7078-MTC-5 (1.5 m cable), 7078-MTC-20 (6 m cable), 7078-MTR (bulkhead receptacle), 7078-KIT (custom connector kit)
