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

Measurement Functions
• 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.