# 3265B Series & 1009 Wayne Kerr DC Bias — Series Overview ## Wayne Kerr 3265B Series DC Bias Units & 1009 DC Bias Fixture — Series Overview - **Five orderable products** in the family: four 3265B-series DC Bias Units (5 A / 10 A / 25 A / 25 A with 3 MHz) and the 1009 DC Bias Fixture for SMD inductors - **Function:** ancillary instruments that extend the Wayne Kerr 3260B Precision Magnetics Analyzer and the 3255B-series Inductance Analyzers (3255BL, 3255B, 3255BQ) into high-current DC-bias measurement - **DC bias range:** 25 mA to 125 A in 25 mA steps (five 25 A units paralleled); 50 A maximum on the 3255BL - **SMD inductor testing:** the 1009 fixture enables up to 50 A DC bias on surface-mount components when used with one or two 3265B units - **Variables measured (impedance mode):** L, Z, R, Q, D - **Basic accuracy:** ± 1% (varies with measurement speed, frequency and options chosen) - **Universal AC input:** 90 to 255 V AC, 47 to 63 Hz - **Safety:** bias safety interlock, internal 1.6 A measurement-terminal fuses, over-temperature trip, sense-lead failure protection Processed / reviewed In summary, the Wayne Kerr 3265B series is a family of four DC Bias Units (3265B/5A, 3265B/10A, 3265B/25A, and 3265BQ/25A) plus the 1009 DC Bias Fixture. The 3265B units are ancillary instruments for Wayne Kerr 3260B Precision Magnetics Analyzers and 3255B-series Inductance Analyzers; the 1009 is an SMD component test fixture that operates with the 3260B and one or two 3265B units. Together they extend impedance measurement (L, Z, R, Q, D) into the high-current DC-bias regime that defines real-world wound-component behavior. ### Which 3265B configuration is right for the application? The correct configuration is determined by two questions: (1) which Wayne Kerr analyzer is in the lab? and (2) what is the maximum DC bias current the wound component will carry in operation? The 3255BL accepts only the 3265B/5A and 3265B/10A; the 3255B, 3255BQ, and 3260B accept all four 3265B variants. For extended 3 MHz bandwidth on the 3260B, the 3265BQ/25A is required. ### How does paralleling work in the 3265B family? 3265B units can be connected in parallel to multiply available DC bias current. Five 3265B/25A or 3265BQ/25A units in parallel deliver up to 125 A. On the 3255BL, multiple 3265B/5A and 3265B/10A units may be paralleled to a maximum of 50 A. In all configurations, the resolution remains 25 mA. Power transfer bus bars (4-324-6009-PAIR) are required between paralleled units to safely carry combined currents. Factually, the 3265B family covers four discrete current tiers — 5 A, 10 A, 25 A, and 25 A with 3 MHz operation — with universal 90 to 255 V AC, 47 to 63 Hz power, ± 1% basic accuracy, an 11 V DC compliance at 0.25 V AC drive level, and 0 °C to 40 °C operating temperature range. The 1009 fixture adds a turn-key 50 A capability for SMD component test when paired with two 3265B/25A units. Wayne Kerr Electronics is one of the primary precision-impedance brands used in component-engineering laboratories worldwide, recognized alongside Keysight (E4990A, E4980A) and Hioki (IM3536) for inductor, transformer, and choke characterization. The 3265B series is the high-current bias accessory that brings the Wayne Kerr analyzer platform into the power-magnetics and EV-magnetics market segments. ### At-a-Glance Comparison Model Max Current Order Code Compatible Analyzers Notes 3265B/5A 5 A 1J3265B/5A 3260B, 3255BL, 3255B, 3255BQ Approved for 3255BL 3265B/10A 10 A 1J3265B/10A 3260B, 3255BL, 3255B, 3255BQ Approved for 3255BL 3265B/25A 25 A 1J3265B/25A 3260B, 3255B, 3255BQ Highest single-unit current 3265BQ/25A 25 A 1J3265BQ/25A 3260B (3 MHz), 3255B, 3255BQ Extended 3 MHz operation on 3260B 1009 (fixture) 50 A (paralleled) 1J1009 3260B + one or two 3265B units SMD inductor test fixture ## Accessories Across the Series All units are supplied with user manual, power cable, spare fuses, 4 × BNC to BNC links and daisy chain control link. The following optional accessories apply across the 3265B series and the 1009 fixture: Accessory Description Order Code Kelvin clip leads (fine jaws) **1EVA40100** Kelvin clip leads (large jaws) **1EVA40180** Power transfer bus bars **4-324-6009-PAIR** Filter pad (washable) **HMDEC10** 1009 DC bias fixture **1J1009** 1009 50A lead set **5-328-2005** ## Compatibility & Common Specifications Family Members 3265BQ/25A, 3265B/25A, 3265B/10A, 3265B/5A DC Bias Units plus 1009 DC Bias Fixture Host Analyzers (3265B units) 3260B Precision Magnetics Analyzer, 3255BQ, 3255B, and 3255BL Inductance Analyzers (3255BL: 3265B/5A & 3265B/10A only) Host Configuration (1009 fixture) 3260B Precision Magnetics Analyzer with one or two 3265B units Measurement Frequency Range (host-dependent) 3255BL: 20 Hz to 200 kHz (3265B/5A or 3265B/10A only); 3255B: 20 Hz to 500 kHz; 3255BQ: 20 Hz to 1 MHz; 3260B: 20 Hz to 3 MHz (with 3265BQ/25A) DC Bias Current Resolution 25 mA Maximum Paralleled Current 125 A (five 25 A units); 50 A on the 3255BL Compliance Voltages Maximum compliance voltage (<12 kHz) 11 V DC at 0.25 V AC drive level. 10 V compliance at 1 V AC drive level. For f>12 kHz deduct 0.5 V. Variables Measured In impedance mode: L, Z, R, Q, D. Not applicable to Rdc, or transformer measurements. Basic Accuracy ± 1%. Varies with measurement speed, frequency and options chosen. Measurement Terminals 2-terminal measurement via M8 studs. 4-terminal measurement via Kelvin leads and M8 studs. Measurement terminals internally protected by 1.6 A fuses against normal inductor back-EMF or accidental disconnection of inductor. Front panel fuses easily replaced. Interlock Bias safety interlock socket on rear panel of analyzer provides door lock and closed control lines. Control Connections I²C bus link controls application of DC current and monitors status of analyzer. Status data includes excessive voltage drop and over temperature. Optional Facilities 3265B bias units may be connected in parallel to give five times the rated current. Temperature Range Storage: −40 °C to 70 °C. Operating: 0 °C to 40 °C, 20 A (3265BQ/25A and 3265B/25A). Full accuracy: 15 °C to 30 °C (at maximum rated current). Power Supply (3265B units) Universal 90 to 255 V AC, 47 to 63 Hz. Input current 9 A rms max. Power factor >0.9. Unit powers up automatically when connected to a powered analyzer. Isolating switch provided. Cooling (3265B units) Fan cooled. Intake front, exhaust rear. Fan filter accessible on front panel. Over-temperature trip provided. Dimensions & Weight (3265B units) Height 190 mm (7 1/2"), Width 440 mm (17 3/8"), Depth 520 mm (20 1/2"). Weight 15 kg (33 lb). **⚠ Important — Analyzer Compatibility** The 3255BL Inductance Analyzer may **only** be used with the 3265B/5A and 3265B/10A. For extended 3 MHz operation with the 3260B, the 3265BQ/25A variant is required. Contact your Test Architect before ordering to confirm the right configuration for the analyzer already in use. This webpage was written by a human with an A.I. "Intern", which may contain errors. Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer. ## Details - **Price:** 0.0 USD - **Vendor:** Wayne Kerr - **Type:** Ana Oth - **Tags:** Analyzers, Manufacturers, Other, product_manual_group_1, Product_new, Wayne Kerr ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 0.00 USD | In stock | --- > Source: [ValueTronics](https://valuetronics.com/products/series-overview-3265b-1009-wayne-kerr-dc-bias-new) > Updated: 2026-05-19