Keysight (Agilent) U1461A Insulation Multimeter, OLED Display, 50V to 1kV

The Keysight U1461A Insulation Multimeter combines 4.5-digit digital multimeter functionality with comprehensive insulation resistance testing in a single, field-hardened instrument. Built for predictive and preventive maintenance in electrical and industrial environments, it delivers insulation measurements up to 260 GΩ across test voltages from 50 V to 1 kV, while supporting full DMM measurements with an OLED display rated for 66,000 counts. Safety-rated to CAT III 1000 V / CAT IV 600 V, the U1461A features IP67 sealing and 3-meter drop protection for demanding field deployment.

Technical Specifications

Insulation Resistance Testing

• Test voltages: 50 V, 100 V, 250 V, 500 V, 1000 V


• Adjustable test voltage: 10 V to 1.1 kV in 1 V steps


• Measurement range: Up to 260 GΩ


• Test modes: Timed, Polarization Index (PI), Dielectric Absorption Ratio (DAR)


• Automatic capacitive discharge and live-circuit inhibit


• Insulation accuracy (50–250 V): 1.5% ± 5 digits; (500–1000 V): 1.2% ± 5 digits Digital Multimeter Functions


• DC voltage: 0.09% ± 1 digit accuracy


• AC voltage (45–65 Hz): 1% ± 3 digits; true-RMS supported


• DC current (600 µA–440 mA): 0.2% ± 1 digit


• AC current (600 µA–440 mA): 1% ± 2 digits


• Resistance: 0.5% to 1.5% ± 2–3 digits depending on range


• Capacitance: 1% ± 2 digits


• Frequency: 0.02% ± 1 digit (99.99 Hz–99.99 kHz)


• Temperature measurement: 1% ± 1 °C


• Diode test, continuity, and non-contact AC voltage detection (Vsense)


• Low-pass filter for variable frequency drive measurements Power & Display


• Four 1.5 V AA batteries


• Battery life: 50–80 hours (brightness-dependent)


• 4.5-digit OLED display, 66,000 counts

Key Features

• Earth bond resistance: 0.5% ± 20 digits (6 Ω range); 0.5% ± 2 digits (60 Ω–60 kΩ)


• Adjustable DC test voltage accuracy: 0.5% ± 1 digit


• Safety-rated design prevents testing on live circuits


• IP67 enclosure, 3-meter drop-proof construction

Typical Applications Predictive maintenance, electrical safety audits, motor winding tests, cable insulation assessment, preventive equipment diagnostics in industrial and commercial facilities.

Compatibility & Integration Optional U1117A Bluetooth adapter enables wireless testing via PC or iOS/Android devices. Automatic test report generation via complimentary reporting software in tabulated or graphical formats.