Keysight / Agilent / HP E1476A High-Density Reed Relay Multiplexer Module

The Keysight/Agilent/HP E1476A is a high-density VXIbus reed relay multiplexer module engineered for automated test and data acquisition systems requiring precise multi-channel switching. This C-size, single-slot register-based module delivers thermocouple-compensated measurements, voltage acquisition, and resistance characterization across 64 temperature channels, 64 three-wire voltage channels, 64 two-wire resistance channels, and 32 four-wire resistance channels. Low-thermal offset reed relays (< 2 µV) ensure measurement integrity in demanding applications. The module's dynamically configurable architecture, dual-bank organization, and integrated analog bus support enable seamless integration into existing VXIbus systems.

## Technical Specifications

• **Module Type:** Register-based VXIbus relay multiplexer, C-size form factor, 1-slot chassis requirement
• **Switching Technology:** Reed relays with low-thermal offset < 2 µV
• **Channel Configuration:** 64 thermocouple channels with automatic cold junction compensation; 64 three-wire voltage channels; 64 two-wire resistance channels; 32 four-wire resistance channels
• **Scanning Rate:** 333 channels/s (typical)
• **Rated Load:** 10⁷ operations
• **Reference Junction Accuracy:** 0.38 °C (18–28 °C operating range)
• **Terminal Block:** QUIC spring clamp with quick connect screwless terminals; accepts 22–26 AWG wire (0.5, 0.75, 0.9 mm)
• **Analog Bus Cable:** 6 cm interconnect cable (E1400-61605) included

## Key Features

• Dual-bank architecture with independent voltage sense and current source control switches
• Three-wire and four-wire measurement support for precision resistance acquisition
• Analog bus access via front panel connectors for external voltmeter/multimeter integration
• Thermocouple temperature measurement with integrated cold junction compensation
• High-integrity signal routing with separate high, low, and guard connections per channel

## Typical Applications

• Multi-point thermocouple temperature monitoring
• High-channel-count voltage data acquisition
• Precision resistance characterization in production test
• Automated thermal and electrical parameter measurement systems

## Compatibility & Integration

Designed for VXIbus modular instrumentation systems with standard register-based control interface. Supports analog bus communication for interconnection with other VXI devices and compatible multimeters. Note: Product is marked obsolete by Keysight; service and support continue through end of worldwide support life.