Fluke 80K-40 High Voltage Probe

The Fluke 80K-40 High Voltage Probe extends the voltage measurement capability of AC/DC voltmeters and multimeters to 40 kV DC or peak AC. Operating as a precision 1000:1 passive voltage divider with 1000 MΩ input impedance, this probe minimizes circuit loading and delivers accurate readings in low-energy applications including CRT circuits, televisions, and photocopiers. It is not suitable for power distribution system measurements.

Technical Specifications Voltage Range

1 kV to 40 kV DC or peak AC

28 kV AC RMS DC Accuracy

±1% from 20 kV to 35 kV at 20°C to 30°C

±2% from 0 kV to 35 kV to 40 kV

Add ±1% for 10°C to 30°C to 45°C when measuring 20 kV to 35 kV DC AC Accuracy

±5% at 60 Hz Electrical Characteristics

Input impedance: 1000 MΩ

Division ratio: 1000:1

Circuit loading: 1 µA per 1 kV

Required meter input impedance: 10 MΩ ±1.0% Safety Rating

IEC 61010-2-031:1993, Type B, Overvoltage Category I

Altitude derating: Above 2000 m to 5000 m, working voltage derates linearly from 40 kV peak to 28 kV peak; transient overvoltage derates from 80 kV peak to 57 kV peak

Key Features

High input impedance minimizes measurement circuit loading and distortion

Precision matched-resistor voltage divider for stable performance

Integrated safety guard protects user during high-voltage measurement

Insulated plastic housing provides electrical isolation

Dual banana plug connectors (0.75" spacing, 0.160" plugs) with earth ground clip lead

Typical Applications Low-energy high-voltage measurement in CRT displays, television circuits, photocopier systems, and similar enclosed environments where voltages to 40 kV require accurate characterization.

Compatibility & Integration Achieves rated accuracy with AC/DC voltmeters and multimeters having 10 MΩ ±1.0% input impedance. Compatible with Fluke and most standard DMM models. Operation requires dry conditions (no condensation) within specified temperature ranges.