Fluke U1500S High Voltage Differential Probe

The Fluke U1500S High Voltage Differential Probe measures differential voltages up to 1500 V DC and 1000 V AC RMS with 0.1% accuracy. This differential probe delivers a 4 mV/V output scaled for direct connection to oscilloscopes and data acquisition instruments, eliminating the need for external scaling calculations. Built to IEC 61010-1 and IEC 61010-2-030 safety standards, it operates safely at CAT III 1000 V and CAT IV 600 V ratings.

Technical Specifications

Measurement Range: 1500 V DC and 1000 V AC RMS continuous Accuracy: 0.1% of reading + 0.1% of range Bandwidth: 100 kHz maximum Input Impedance: 2 MΩ and 10 MΩ Input Capacitance: <10 pF Scale Factor: 4 mV/V Common Mode Rejection Ratio: 60 dB at 50 Hz Temperature Coefficient: 0.05% / °C (outside 18 °C to 28 °C range) Over-range Protection: 10% over range Input Terminals: 4 mm banana jacks Output Terminal: BNC female with 1.6 m BNC to 4 mm banana plug cable Dimensions: 138 mm × 75 mm × 45 mm Weight: 295 g (battery included) Ingress Protection: IP40 (terminals mated) Battery: 4 × AA alkaline cells (IEC LR6), 168 hours typical life Operating Temperature: −10 °C to 50 °C Operating Humidity: ≤90% RH (10 °C to 30 °C), ≤75% RH (30 °C to 40 °C), ≤45% RH (40 °C to 50 °C) Operating Altitude: 2000 m

Key Features

• High-voltage differential measurement capability with galvanic isolation


• Low-noise 60 dB CMRR reduces common-mode interference


• Linear 4 mV/V output enables direct instrument scaling


• Battery-powered operation with visual status indicators (green working, red low battery)


• Compact design fits tight test points on automotive and power electronics assemblies

Typical Applications

• Power electronics circuit characterization and troubleshooting


• Automotive system diagnostics (battery bus monitoring, motor control)


• Industrial control and variable frequency drive measurements


• DC bus bar voltage acquisition in renewable energy systems

Compatibility & Integration Standard BNC output connects directly to oscilloscopes, multimeters, and data loggers. Output voltage scales within the connected instrument to display real-unit readings without manual conversion.