Keysight / Agilent / HP 3498A Extension Mainframe

The Keysight / Agilent / HP 3498A is an extension mainframe for modular data acquisition and automated test systems. Designed to expand a primary controller such as the 3497A, it accommodates up to 10 plug-in assemblies and scales to support complex measurement and control applications with significantly increased I/O channel capacity.

## Technical Specifications

• Mainframe capacity: 10 plug-in assemblies per unit
• Scalability: One 3497A supports up to thirteen 3498A extension mainframes for a total of 135 plug-in assemblies
• Maximum analog assemblies: 45
• Maximum digital assemblies: 85
• Maximum channel capacity: 1000 analog channels or 1360 digital channels
• Power supply: Switch-selectable AC input at 110, 120, 220, and 240 volts ±10%, 48–66 Hz
• Physical dimensions: 190.5 mm H × 428.6 mm W × 520.7 mm D (7″ × 16″ × 20″)
• Net weight (fully populated): 20.4 kg (45 lb)
• Shipping weight: up to 26.3 kg (58 lb)

## Key Features

• Requires 3497A or 34980A primary controller for operation
• Modular plug-in architecture for custom system configuration
• Connectivity managed through controlling mainframe; 3497A provides HP-IB interface
• Flexible mixed-module support for analog and digital assemblies

## Typical Applications

Multi-channel data logging, automated test sequencing, distributed sensor networks, and control system integration where expansion beyond a primary controller’s slot capacity is required.

## Compatibility & Integration

Designed as an extension chassis for the HP 3497A Data Acquisition/Control Mainframe and referenced as Option 298 when paired with the 3497A. Also compatible with the 34980A Multifunction Switch/Measure Unit. Legacy product; Keysight’s 34980A offers modern alternatives with integrated DMM, scan rates to 1000 channels/second, and LAN/USB/GPIB connectivity.