The Racal Instruments 1260-37A is a C-size, single-slot VXIbus switching module that combines 40 Form C (SPDT) relays with eight 1×6 multiplexers in a compact footprint. It consolidates extensive switching capability within one VXI slot, reducing chassis real estate while delivering high-density signal routing for precision test environments. The module includes relay coil monitoring for user-selectable confidence verification, ensuring relay integrity across measurement cycles.
Technical Specifications
Switching Architecture
• 40 Form C (SPDT) switches and eight 1×6 multiplexers
• Multiplexer expansion via on-board jumpers: four 1×12, two 1×24, or one 1×48 two-wire channel configuration
• Signal capacity: 1 A at 250 VDC or ACrms
• Power rating: 60 W per channel, 62.5 VA per channel
• Switching time: 2 mS
Electrical Performance
• Closed channel resistance: 2×10⁹ Ω
• Open channel capacitance: <50 pF
• Bandwidth (-3dB): 35 MHz
• Insertion loss: <0.1 dB to 100 kHz, <0.5 dB to 1 MHz, 40 dB to 100 kHz, >35 dB to 1 MHz, >28 dB to 10 MHz (50 Ω termination)
• Crosstalk: <-40 dB at 100 kHz and 1 MHz, <-20 dB at 10 MHz (50 Ω termination)
Relay Life
• Mechanical: 1×10⁸ operations
• Electrical: 500,000 operations at 30 V / 1 A; 1,000,000 typical at 60 W
– Key Features
• Relay coil monitoring with user-selectable confidence checking
• Flexible multiplexer configuration for diverse switching topologies
• Low on-resistance and high DC isolation
• Broadband AC performance to 35 MHz with controlled crosstalk
– Compatibility & Integration
Controlled via Racal Instruments Option 01 message-based interface or Option 01T message-based and register-based interface; smart card (Option 01) may be required. Module features crimp connectors; IDC (ribbon cable) connector options available separately. Supplied with one set of mating connectors.
Physical
• Weight: 3.07 lb (1.38 kg) without Option 01; 3.35 lb (1.51 kg) with Option 01
