The Keithley 7078-TRX-BNC is a male three-slot triaxial to female BNC adapter that bridges triaxial connectors on precision test instruments to standard BNC cables. Engineered for low-noise sensitive measurements, it maintains excellent electrical isolation and contact integrity across demanding test environments. The brass construction with nontarnish finish and PTFE insulation ensures long service life and reliable performance in laboratory and production settings.
## Technical Specifications
**Electrical Performance**
• Connector Type: 3-slot male triaxial to female BNC
• Working Voltage: 500 V peak (center conductor to inner shield); 30 V peak (inner shield to outer shell)
• Maximum Working Current: 1 A peak
• Contact Resistance: <0.5 Ω
• Insulation Resistance: 10¹⁵ Ω (center conductor to inner shield at 500 V test voltage)
**Physical & Environmental**
• Material: Brass with nontarnish finish and PTFE insulation
• Operating Temperature: 0 °C to 50 °C
• Operating Humidity: Up to 70% relative humidity at temperatures up to 35 °C
• Package Dimensions: 2.75 × 6.75 × 13 inches (nominal)
## Key Features
• Triaxial outer shield connected to BNC shell for noise rejection in three-conductor measurements
• High insulation resistance (10¹⁵ Ω) supports picoampere and sub-picoampere level instrumentation
• Low contact resistance (<0.5 Ω) minimizes measurement errors in voltage and resistance applications
• Brass construction resists corrosion and tarnishing in extended storage
• PTFE insulation maintains electrical properties across the full operating temperature range
## Typical Applications
Low-level DC measurements, guarded three-terminal connections, high-impedance test setups, and environments requiring shielded signal paths with minimal leakage current.
## Compatibility & Integration
Designed for direct integration with Keithley switching systems (7072, 7072-HV), picoammeters (6482, 6487), electrometers (6514, 6517A, 6517B), source measure units (236, 238, 2634B, 2635B, 2636B), capacitance-voltage meter (4210-CVU), LCZ meter (7051), and test fixtures (8006, 8008 when used with Model 7078-TRX-GND). Compatible with Keithley Model 4801 triaxial cables.
