The Racal Instruments 1260-12 is a 20-channel DPDT relay switching module designed for signal routing and external device control in automated test systems. Each channel handles up to 2 A at 220 VDC or 250 VAC, with individual relay coil monitoring for operation verification. Channels operate independently or interconnected to form custom switching networks, accommodating both DC and AC applications from DC through 35 MHz.
Technical Specifications
Switching Performance
• 20 DPDT channels
• Maximum switching voltage: 220 VDC or 250 VAC (terminal-terminal or terminal-chassis)
• Maximum switching current: 2 A per channel (DC or AC)
• Maximum switching power: 60 W DC per channel; 62.5 VA per channel
• Path resistance: 200 mΩ at 2 A
• Isolation: 10⁹ Ω
• Switching time: <10 ms (includes settling)
AC Characteristics (50 Ω load)
• Bandwidth: 35 MHz typical (-3 dB)
• Insertion loss: <0.2 dB @ 100 kHz; <0.25 dB @ 1 MHz; <0.5 dB @ 10 MHz
• Crosstalk: <-75 dB @ 100 kHz; <-60 dB @ 1 MHz; <-40 dB @ 10 MHz
• Capacitance (open channel): <25 pF; (channel-chassis): <25 pF; (high-low): <50 pF
Reliability
• Mechanical operations: 10,000,000
• Electrical operations (full rated load): 100,000
• MTBF: 979,058 hours per MIL-HDBK-217
Environmental
• Operating temperature: 0°C to 55°C
• Storage temperature: -4°C to 75°C
• Relative humidity: 85% ±5% non-condensing at 30°C
• Operating altitude: 10,000 ft
• Shock: 30 g, 11 ms, ½ sine wave
• Vibration: 0.013 in (pk-pk), 5 to 55 Hz
• Weight: 2.59 lb without Option 01; 2.87 lb with Option 01
– Key Features
• Relay coil monitoring with user-selectable confidence checking
• C-size, single-slot VXIbus module form factor
• Bench handling rated to 4-inch drop at 45°
– Compatibility & Integration
• VXIbus interface with integrated VXI plug&play support
• GPIB/RS-232 and LXI switching system compatibility
• VXIplug&play drivers for LabWindows/CVI and LabVIEW
• Programming via standard module addressing syntax (e.g., "CLOSE 3.02")
• Message-based control with Option 01 for advanced features including scan lists and custom path naming
