The Keysight (Agilent) U3401A is a 4½ digit dual-display digital multimeter engineered for electronics testing, troubleshooting, and general-purpose laboratory and field service measurements. Its dual LED display enables simultaneous viewing of primary and secondary measurement values, significantly enhancing diagnostic efficiency. The instrument delivers precise AC and DC voltage and current measurements across multiple ranges, along with resistance testing, diode characterization, and continuity verification.
Technical Specifications
Voltage Measurement
• DC: 50 mV to 1000 V (six ranges); accuracy ±(0.05% reading + 2 counts) on 500 mV–500 V, ±(0.1% reading + 2 counts) on 50 mV and 1000 V
• AC (True RMS): 500 mV to 750 V (five ranges); accuracy ±(0.5% reading + 5 counts) on 500 mV–500 V, ±(1.0% reading + 5 counts) on 750 V; frequency response 20 Hz to 20 kHz
• Input impedance: 10 MΩ nominal
Current Measurement
• DC: 500 µA to 10 A (five ranges); accuracy ±(0.2% reading + 3 counts) on 500 µA–500 mA, ±(1.0% reading + 5 counts) on 10 A
• AC (True RMS): 500 µA to 10 A (five ranges); accuracy ±(1.0% reading + 5 counts) on 500 µA–500 mA, ±(2.0% reading + 10 counts) on 10 A; frequency response 20 Hz to 20 kHz
• Burden voltage: 0.2 V nominal at full scale
Resistance
• Ranges: 50 Ω to 50 MΩ (seven ranges); accuracy ±(0.1% reading + 2 counts) on 50 Ω–5 MΩ, ±(0.5% reading + 5 counts) on 50 MΩ
• Test currents: 1 mA (50 Ω and 500 Ω), 100 µA (5 kΩ–50 kΩ), 10 µA (500 kΩ–5 MΩ), 1 µA (50 MΩ)
Diode and Continuity
• Diode test: 1 mA nominal test current, ~3.0 V open-circuit voltage
• Continuity: Audible beep below ~50 Ω threshold; 1 mA nominal test current
Display
• Dual 4½ digit LED displays; 50,000 counts resolution each
– Key Features
• Dual-display architecture for parallel measurement and status monitoring
• Auto-ranging capability for streamlined operator workflow
• True RMS AC measurements (20 Hz–20 kHz)
• Wide current range with 10 A capability
• High-impedance voltage inputs (10 MΩ nominal)
– Typical Applications
Electronics service and repair, circuit diagnostics, field maintenance, laboratory characterization, component validation.
