The Keysight N1425A is a shielded test lead assembly engineered for precision high-resistance measurement in femtoampere and picoampere applications. At 1.5 meters in length, these leads deliver the noise immunity required for accurate measurements up to 100 GΩ, making them essential infrastructure for advanced electrometer and picoammeter systems. The shielded construction actively suppresses electrical noise—critical when resolving currents in the femto- to picoampere range across teraohm-level resistances.
Technical Specifications
• Cable length: 1.5 m
• Maximum DC voltage: 1000 V
• Maximum current: 0.5 mA
• Measurement range: Up to 100 GΩ
• Shielded construction for noise reduction
• Built-in interlock circuit for safe high-voltage operation
– Key Features
• Shielded cable design minimizes capacitive and electromagnetic coupling
• Rated for teraohm-level resistance measurements
• Voltage and current ratings support high-impedance measurement applications
• Interlock safety feature protects both user and instrument during high-voltage work
• Modular adapter compatibility enables flexible DUT connection schemes
– Typical Applications
The N1425A addresses measurement challenges in semiconductor characterization, material science, and component quality assurance—any domain requiring sub-picoampere sensitivity across extreme impedance ranges. Leakage current testing, surface resistivity measurement, and insulation integrity validation all demand the noise floor this lead system provides.
– Compatibility & Integration
The N1425A connects directly to Keysight B2985A/B and B2987A/B femtometer/picoammeters and electrometers via the N1413A High Resistance Meter Fixture Adapter. Three fixture options expand its utility: the N1426C accommodates large device terminals; the N1426A suits small DUTs such as PC board assemblies and IC sockets; the N1426B provides breakout termination for custom lead configurations. Complete guidance is available in the N1424/N1425/N1427/N1428 accessories user manual.
