Agilent/Keysight 3438A

The Agilent/Keysight 3438A is a 3.5-digit digital multimeter delivering five measurement functions for bench and system-level electronic testing. This autoranging instrument measures AC and DC voltage, AC and DC current, and resistance with a bright 7-segment red LED display. The 3438A integrates HP-IB (GPIB) control for remote operation in automated test configurations, supporting both addressable and talk-only modes.

Technical Specifications

• DC and AC voltage


• DC and AC current


• Resistance (ohms) Display & Conversion


• 7-segment red LED, 0.3 inch high, with function and range annunciation


• Dual-slope analog-to-digital conversion


• 100 msec integration time Input Specifications


• Maximum input: 1200 V (DC + peak AC)


• Input resistance: 10 MΩ ± 1%


• Shunt capacitance: < 50 pF


• Floating input, 500 V maximum common-mode to ground


• Sensitivity: 100 µV on the 200 mV range Performance Characteristics


• Automatic polarity sensing and display


• Normal mode rejection: 40 dB at 50 Hz and 60 Hz ± 1 Hz


• Response time: < 0.7 seconds to 1-digit accuracy on single range; add 1 second per range change


• Reading rate: 2.4–4.7 readings/second depending on input level Ranging Modes


• Automatic or manual for AC voltage, DC voltage, and ohms


• Manual only for AC and DC current Environmental & Power


• Operating temperature: 0°C to 55°C


• Storage temperature: -40°C to +76°C


• Humidity: 0–95% RH at 40°C


• AC line power; standard rack mount case (rack kit not included)

Key Features

• HP-IB/GPIB interface for integration into automated test systems


• Addressable and talk-only communication modes


• Autoranging on voltage and resistance measurements


• Manual function and range selection when required

Typical Applications

• Laboratory bench testing and troubleshooting


• Automated test equipment (ATE) systems


• Process monitoring and quality control


• Field service and maintenance

Compatibility & Integration The 3438A connects directly to GPIB-based test systems and can operate as a standalone instrument or as part of a larger measurement network. Both addressable and talk-only modes enable flexible system configuration and legacy equipment compatibility.