The HP/Agilent 42841A Bias Current Source is a DC bias accessory for Agilent/Keysight impedance analyzers, delivering stable current to devices under test for impedance characterization across varying bias conditions. It enables precise measurement of components—particularly inductors—under simulated operational currents, essential for R&D, quality control, and production testing in switching power supplies and RF applications.
Technical Specifications
DC Bias Current Ranges:
• 0.00 A to 1.00 A: Resolution 0.01 A, Accuracy ±(1% + 5 mA)
• 1.1 A to 5.0 A: Resolution 0.1 A, Accuracy ±2%
• 5.1 A to 20.0 A: Resolution 0.1 A, Accuracy ±3%
Maximum Output Current:
• 10 A with 4285A
• 20 A with 4284A (single unit)
• 40 A with 4284A (two units in parallel)
• 40 A with E4980A (two units in parallel)
Frequency Range (dependent on host analyzer):
• 20 Hz to 2 MHz with E4980A
• 20 Hz to 1 MHz with 4284A
• 75 kHz to 30 MHz with 4285A
– Key Features
• Front panel control via compatible LCR meter
• Modular design supporting single or dual-unit configurations for higher current requirements
• Tiered accuracy specifications: ±(1% + 5 mA) at sub-ampere levels, ±2–3% at higher ranges
• Installation Category II, Pollution Degree 2 per IEC 1010-1
• Indoor-use only, standard AC power input
– Compatibility & Integration
The 42841A integrates with:
• E4980A (Option E4980A-002)
• 4284A (Option 4284A-002)
• 4285A (Option 4285A-002)
Complete measurement systems require compatible bias test fixtures (42842A, 42842B, or 42842C), appropriate test leads, and bias current cables per configuration. Dual-unit 40 A configurations demand the 42842B fixture and 42843A bias current cable.
