AMC Barkhausen Tester PCB 549637-003 Rev XA Custom Enclosure DB25 DB9

AMC Barkhausen Tester PCB 549637-003 Rev XA Custom Enclosure DB25 DB9

This is an AMC Barkhausen Tester printed circuit board, part number 549637-003 Rev XA, housed in a custom-built desktop enclosure. The Barkhausen effect refers to the series of small, sudden changes in magnetization that occur in ferromagnetic materials as an external magnetic field is applied or varied — Barkhausen noise measurement instruments like this one are used to characterize magnetic properties of materials, detect surface stress or heat treatment anomalies in steel components, and support non-destructive testing (NDT) applications in manufacturing and quality control. This unit is being sold AS-IS for parts or repair and is not guaranteed functional.

Specifications & What's Included

• Brand: AMC
• PCB Part Number: 549637-003
• PCB Revision: Rev XA
• Enclosure: Custom aluminum/steel desktop enclosure with blue accent trim
• Front panel: 4-digit red LED numeric display (shown reading 9999), red indicator lamp, toggle switch
• Front panel: Open window exposing IDC 26-pin ribbon cable connector for external sensor/probe connection
• Rear panel: IEC C14 AC power inlet with rocker switch
• Rear panel: DB25 female connector (with rainbow ribbon cable attached internally)
• Rear panel: DB9 female connector
• Internal: Green PCB populated with multiple DIP ICs and discrete components
• Internal: Separate power supply module mounted alongside PCB
• Included: Enclosure with PCB installed, internal ribbon cable assembly, rear DB25 and DB9 connectors as shown
• Sold AS-IS — not tested, no functionality guarantee

Applications

Barkhausen noise (BN) measurement is a non-destructive testing technique used to evaluate the surface integrity of ferromagnetic materials, particularly hardened steel components. It is commonly applied in the aerospace, automotive, and precision machining industries to detect grinding burns, residual stress, and surface microstructure changes in ground or heat-treated parts — conditions that can indicate fatigue risk or manufacturing defects invisible to the eye. Instruments of this type typically connect to a dedicated electromagnetic sensor (excitation coil and pickup coil) placed on the test surface; the PCB conditions and analyzes the resulting Barkhausen noise signal and outputs a numeric reading correlated to surface stress or hardness. Systems of this class were used in production-line quality inspection of bearing races, gears, camshafts, and similar critical components from the 1980s onward. The AMC designation and PCB construction style suggest this is a specialty industrial instrument from that era. A buyer with knowledge of Barkhausen testing systems or AMC instruments may find the PCB, enclosure, connectors, and subcomponents individually useful for repair, reverse engineering, or system reconstruction.