HP / Agilent 42842C Bias Current Test Fixture

The HP/Agilent 42842C Bias Current Test Fixture is a precision accessory that enables DC bias current injection during impedance measurements on components under real-world operational conditions. Designed for use with the HP/Agilent 42841A Bias Current Source and compatible LCR meters, it delivers stable, repeatable measurements critical for component characterization in R&D and quality assurance. The fixture accommodates standard devices smaller than 60(W) × 50(H) × 60(D) mm, with optional SMD support down to 1.6(L) × 0.8(W) mm. A clear plastic safety cover reduces back-e.m.f. voltage below 40 V within 0.1 second upon opening, while an integrated heat-sensitive switch prevents DUT thermal damage. DC bias voltage monitoring is provided throughout operation.

– Technical Specifications

• Maximum DC Bias Current: 10 A
• Maximum Voltage: ±40 V peak (AC+DC)
• Frequency Range (with Agilent 4285A): 75 kHz to 30 MHz
• Operating Temperature: 0°C to 55°C
• Operating Humidity: ≤95% RH at 40°C
• DUT Size (Standard): <60(W) × 50(H) × 60(D) mm
• DUT Size (with Option 001): Minimum 1.6(L) × 0.8(W) mm SMD
• Dimensions (without SMD fixture): 122(W) × 60(H) × 58(D) mm
• Weight (without SMD fixture): 145 g

– Key Features

• DC bias voltage monitoring integrated into fixture design
• Dual safety architecture: back-e.m.f. suppression and thermal overload protection
• Direct connection to 42841A Bias Current Source output terminals
• Directly controllable via HP 4284A/4285A with Option 002
• Optional SMD Test Fixture (42842C-001) for surface mount device evaluation
• Includes shorting plate and operation/service manual

– Typical Applications

• Inductor characterization under DC bias load
• Component impedance measurement under simulated operational conditions
• SMD and discrete component performance evaluation

– Compatibility & Integration

Primary compatibility: HP/Agilent 4285A Precision LCR Meter with Option 4285A-002. Secondary compatibility: HP 4284A Precision LCR Meter. Requires HP/Agilent 42841A Bias Current Source for operation.