Agilent/Keysight 3490A

The Keysight 34970A is a modular data acquisition and switch unit built around a 6½-digit (22-bit) digital multimeter with integrated signal routing and automated test capabilities. The three-slot mainframe accepts plug-in modules for multiplexing, matrix switching, RF switching, digital I/O, and analog output functions, enabling channel scanning up to 250 channels per second and support for up to 11 measurement functions including temperature, voltage, resistance, frequency, period, and current. Non-volatile memory stores 50,000 readings for uninterrupted data logging across power cycles.

– Technical Specifications

• DMM Resolution: 6½ digits (22-bit) with 0.004% basic DCV accuracy
• Scanning Speed: Up to 250 channels per second
• Module Slots: 3 configurable slots
• Data Storage: 50,000 readings non-volatile memory
• Measurement Functions: 11 direct measurements—AC/DC voltage, 2- and 4-wire resistance, AC/DC current, frequency, period, thermocouples, RTDs, thermistors
• Alarm Outputs: Hi/LO limits per channel plus 4 TTL alarm outputs
• Interfaces: GPIB, RS-232; optional LAN and USB (34972A model)
• Web Interface: Graphical browser-based control and monitoring (34972A model)
• Power: Grounded connection required; indoor use only, installation category II, pollution degree 2

– Key Features

• Built-in signal conditioning for thermocouple, RTD, and thermistor measurements
• Modular architecture supports eight different plug-in module types
• SCPI-compatible command language for test automation
• BenchVue software included with BenchVue DAQ Control and Analysis app support
• Representative modules: 34901A (20-channel 2/4-wire multiplexer, 60 ch/s), 34908A (40-channel single-ended, 60 ch/s), 34903A (digital I/O and analog outputs), 34904A (matrix switching)

– Typical Applications

• Automated test systems requiring multi-channel data acquisition
• Temperature monitoring with thermocouple or RTD networks
• Precision measurement and signal routing in production test
• High-speed data logging with local or remote access

– Compatibility & Integration

GPIB and RS-232 interfaces enable integration into existing test environments. LAN and USB connectivity available on the 34972A variant. SCPI compatibility ensures software portability across Keysight instruments.