Keysight (Agilent) 16065A

The Keysight (Agilent) 16065A is a four-terminal-pair external bias fixture that applies DC bias voltage or current to a device under test during LCR or impedance measurements. It enables component characterization under operating bias when the primary instrument lacks internal DC bias capability or cannot supply required voltage levels. The fixture accepts external voltage sources up to ±200 VDC via a dedicated DC BIAS INPUT BNC connector and provides a DC BIAS MONITOR BNC connector for observing DC voltage across the DUT. A 5.6 µF series blocking capacitor isolates the applied DC from the measuring instrument while preventing use of internal bias sources. The 16065A supports four-terminal-pair measurements on 2-terminal components across a frequency range of 5 Hz to 15 MHz (50 Hz to 2 MHz in certain configurations). Maximum combined AC+DC voltage is ±42 V peak. Three interchangeable contact inserts enable measurement of axial-lead, radial-lead, and short radial-lead components. Operating temperature range spans 0 °C to 55 °C. Dimensions are 180 mm width × 120 mm height × 200 mm depth with approximately 40 cm cable length and 1.5 kg weight.

– Technical Specifications

• Maximum external DC bias: ±200 VDC
• Frequency range: 5 Hz to 15 MHz (50 Hz to 2 MHz alternate range)
• Maximum voltage (AC+DC): ±42 V peak
• Series blocking capacitor: 5.6 µF
• DUT connection: 2-Terminal
• Terminal connector: 4-Terminal Pair, BNC
• Operating temperature: 0 °C to 55 °C
• Dimensions: 180 mm × 120 mm × 200 mm
• Cable length: Approximately 40 cm
• Weight: Approximately 1.5 kg

– Key Features

• High-voltage BNC socket for DC bias input
• DC bias monitor output via BNC connector
• Integrated 5.6 µF blocking capacitor prevents DC backflow into measuring instrument
• Three interchangeable electrode inserts: axial-lead, radial-lead, radial short-lead
• Included shorting bar and operation/service manual

– Typical Applications

• Component characterization under DC bias conditions
• Extended voltage biasing when instrument internal sources are insufficient
• Impedance and LCR measurements on passives with applied DC offset
• Testing of zener diodes, capacitors, and inductors under bias

– Compatibility & Integration

Designed for 4-terminal-pair LCR meters and impedance analyzers. Electrode modules are interchangeable with Keysight 16047A/D fixtures. When used with 4284A Option 001, zener diode limits signal level to AC maximum 7 V. Not suitable for applications requiring the instrument’s internal bias source; use 16047B Test Fixture instead.