Keithley 6103C High Voltage Probe

The Keithley 6103C High Voltage Probe is a precision DC measurement instrument for voltmeters and electrometers requiring accurate readings up to 30,000 V. With a 1000:1 division ratio and 380 GΩ input resistance, it delivers minimal loading effects on high-impedance measurement instruments. The probe connects via UHF connector and includes a 30-inch (0.8 m) cable with a 4-foot ground lead terminated in alligator clip and banana plug.

Designed for demanding applications in electronics testing, research, and equipment maintenance where high-voltage DC measurements demand accuracy and stability.

Technical Specifications

• Voltage Range: 0 to 30,000 V DC


• Division Ratio: 1000:1


• Ratio Accuracy: ±5%


• Input Resistance: 3.8 × 10¹¹ Ω (380 GΩ)


• Internal Divider Resistor: 375 MΩ


• Cable Length: 30 inches (0.8 m)


• Physical Dimensions: 76 mm diameter × 387 mm length


• Net Weight: 341 g (12 oz)

Key Features

• UHF connector interface for direct integration with electrometer and voltmeter inputs


• High input impedance minimizes circuit loading; less than 0.5% loading error when paired with 10 GΩ input resistance instruments


• Integrated ground lead assembly with alligator clip and banana plug connector


• Compact form factor suitable for bench and field measurements


• Operating restriction: avoid use above 60% relative humidity

Typical Applications

• High-voltage DC testing in power electronics and equipment development


• Electrostatic discharge (ESD) monitoring and verification


• Equipment maintenance and troubleshooting at voltages to 30 kV


• Research environments requiring precision DC high-voltage measurement

Compatibility & Integration The probe is engineered for use with electrometers or DC voltmeters having nominal input impedance of 10 GΩ or greater. Connection requires the voltmeter's low terminal connected to safety ground, the probe's UHF connector to the voltmeter's high input, and the ground lead between the voltmeter's low terminal and the source low. When measuring 30 kV, the voltmeter must be set to 100 V full-range; each 1 V increment displays as 1 kV measured. Always inspect probe body, cables, and connectors for damage before use.