Agilent/Keysight N1425B

The Keysight N1425B Low Noise Test Leads are precision shielded leads engineered for high-resistance measurements on the B2980 Series femtometer/picoammeters and electrometers. Featuring 3-meter shielded cable construction, the N1425B reduces electrical noise in sensitive measurement environments, supporting resistance values up to 100 GΩ with an integrated safety interlock for high-voltage operation.

Technical Specifications

• Length: 3 meters


• Maximum Voltage: 1000 V


• Maximum Current: 0.5 mA


• Measurement Capability: High resistance up to 100 GΩ


• Noise Architecture: Shielded cable construction


• Safety: Built-in interlock circuit for high-voltage measurements

Key Features The shielded cable design is critical for precision work - it actively suppresses environmental electrical noise that would otherwise corrupt measurements in the picoampere and femtoampere ranges. The interlock circuIt has operator protection during high-voltage testing scenarios. The 3-meter length accommodates both bench and remote measurement setups without compromising signal integrity.

Typical Applications The N1425B excels in high-resistance metrology, leakage current measurement, and electrostatic discharge (ESD) characterization. Common use cases include semiconductor device testing, insulation resistance verification, and surface leakage analysis on components requiring measurement sensitivity in the gigaohm range.

Compatibility & Integration The N1425B connects directly to Keysight B2985B and B2987B electrometers via the N1413A High Resistance Meter Fixture Adapter. System flexibility is achieved through optional accessories:

N1426C: Accommodates devices with large terminals

N1426A: Enables small DUT testing (PC boards, IC sockets)

N1426B: Supports custom test lead construction Reference the User's Guide for N1424/N1425/N1427/N1428 Accessories (available for both B2985B/B2987B and B2985A/B2987A models) and the B2980 Series data sheets for detailed integration specifications.