The Keysight U1231A is a handheld True RMS digital multimeter engineered for field and laboratory measurements across voltage, resistance, capacitance, frequency, and diode testing. Its 6000-count display delivers 4-digit resolution with auto and manual ranging modes, accommodating diverse measurement scenarios with ±0.5% DC voltage accuracy and ±1.0% AC voltage accuracy.
Technical Specifications
DC voltage measurement spans 600 mV to 600 V with ±0.5% + 2 counts accuracy and 10 MΩ typical input impedance. AC voltage ranges from 600 mV to 600 V with ±1.0% + 3 counts accuracy, 10 MΩ nominal input impedance in parallel with <100 pF, and 600 Vrms overload protection. Resistance measurement extends to 60 MΩ maximum with <3 V DC open voltage and audible continuity feedback below 23 Ω ± 10 Ω. Capacitance measurement capability includes a maximum 1200-count display. Frequency measurement is supported. Diode testing features <3 V DC open voltage with continuous beep below 50 mV and single beep for forward-biased junctions (0.3 V to 0.8 V).
A Low Impedance (ZLOW) mode with 3 kΩ nominal input impedance eliminates ghost voltage artifacts. Intermittent measurement capture time exceeds 1 ms. Temperature measurement requires separately purchased Type-K thermocouple probe and adapter or temperature module.
– Key Features
• Built-in LED flashlight for low-light visibility
• Audible beeper and flashing backlight for continuity alerts
• Min/Max recording and Display Hold / Auto-Hold functions
• Null function for baseline subtraction
• Data logging stores up to 10 readings
• Four 1.5V AAA alkaline batteries provide ~500 hours operation
• CAT III 600V overvoltage protection rating
• Ergonomic design
– Typical Applications
Electrical troubleshooting, component testing, circuit validation, field service diagnostics, and bench-top measurements in industrial and maintenance environments.
– Compatibility & Integration
IR-to-USB connectivity enables PC data transfer via Keysight GUI Data Logger software (downloadable). Temperature measurement expansion available through optional adapters and modules.
