Astronics / EADS / Racal 1260-38T High Density Multiplexer Module (Option 01 or 01T Compatible)

The Astronics/EADS/Racal 1260-38T is a high-density multiplexer module designed for signal routing and data transmission in automated test equipment, continuity testing, and telecommunications systems. This C-size single-slot VXIbus module supports user-configurable multiplexer topologies ranging from sixteen independent 1x8 units to cascaded 1x128 configurations under program control. Both two-wire and four-wire switching modes are supported across a bandwidth exceeding 30 MHz, with insertion loss below 0.1 dB at 100 kHz and isolation greater than 45 dB at 10 MHz. Electromechanical relays provide switching capability up to 220 VDC/VAC at 2 A maximum, with total power handling to 60 W or 125 VA. The module integrates VXIplug&play drivers for LabWindows/CVI and LabVIEW frameworks, requiring a Racal Instruments Option 01 or Option 01T switch controller for operation.

Technical Specifications

Form Factor: C-size, single-slot VXIbus module

Multiplexer Configurations: Sixteen 1x8 units; cascadable to 1x128

Switching Modes: Two-wire and four-wire

Bandwidth (-3 dB): >30 MHz (1x8 configuration)

Insertion Loss: <0.1 dB @ 100 kHz; <0.25 dB @ 1 MHz (1x8); <0.2 dB @ 1 MHz (1x128); 45 dB @ 10 MHz (1x8)

Crosstalk: <−50 dB @ 10 MHz (1x8)

Maximum Switching Voltage: 220 VDC or 220 VAC

Maximum Switching Current: 2 ADC or 2 AAC

Maximum Switching Power: 60 W; 125 VA

Path Resistance: <750 MΩ (1x8, two-wire)

Insulation Resistance: 10⁹ Ω

Thermal EMF: <15 µV (1x8, two-wire)

Capacitance: <5 pF channel to chassis (1x8)

Switching Time: <5 ms maximum

Key Features

Electromechanical relay-based architecture

Front panel guard grounds minimize crosstalk and enhance isolation

Operating temperature range: 0°C to 55°C

Storage temperature range: −40°C to 75°C

Shock rating: 30 g, 11 ms, ½ sine wave

Vibration: 0.013 in. peak-to-peak, 5–55 Hz

CE Mark compliance for RF emissions and electrical safety

Compatibility & Integration Requires Racal Instruments Option 01 (native command set) or Option 01T (message-based and register-based operation). VXIplug&play support included for Microsoft Win32 API-based frameworks.