Barkhausen Noise - Stress Measurement - BN Rollscan 210

Overview

The Barkhausen Noise Rollscan 210 is a portable analog Barkhausen noise analyzer for on-site quality control and detection of near-surface defects — grinding burns, heat treatment issues, and stress or microstructure changes in ferritic steels and other ferromagnetic materials. A front-panel LED bar graph and numerical display show RMS value, limit value, and magnetizing voltage, with all measurement parameters adjustable through front-panel controls on a single measurement channel.

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Dimensions in millimeters

Features

LED bar graph display with numerical readout of Barkhausen noise RMS value, limit value, and magnetizing voltage
Measurement parameters adjustable directly through front-panel controls; single measurement channel via PPC14 sensor connector
Adjustable audible buzzer alerts the operator when the set measurement limit is exceeded
Magnetizing frequency range of 1–500 Hz (sine wave), magnetizing voltage adjustable 0–16 Vpp, analyzing filter range 70–200 kHz
Four output connectors for oscilloscope monitoring (Scope/X2), analog RMS output (Rec/X3), oscilloscope sync (Sync/X4), and limit-relay alert (AUX/X5)

Applications

For testing near-surface defects such as grinding burns, heat treatment defects, as well as changes in stress and microstructure in ferritic steels and other ferromagnetic materials. Applications include:

Camshafts, crankshafts, gears, bearings, landing gear components, and grooves/holes
Machining processes – grinding, turning, milling
Cold working processes – shot peening, laser peening, autofrettage
Surface hardening processes – carburizing, nitriding, induction hardening
Dynamic processes such as creep and fatigue monitoring

Analysis

Optimize your manufacturing process and deliver the highest quality components by using Barkhausen noise analysis for detection of grinding burn damage and heat treatment defects.

Analysis

Barkhausen noise analysis is a non-destructive method involving the measurement of a noise like signal induced in a ferromagnetic material by an applied magnetic field.

There are two main material characteristics that will directly affect the intensity of the Barkhausen noise signal:

The microstructure of the sample – this effect can be broadly described in terms of hardness: the noise intensity continuously decreases in microstructures characterized by increasing hardness.
Presence and distribution of elastic stresses – compressive stresses will decrease the intensity of Barkhausen noise while tensile stresses increase the intensity.

Measurement principle

Barkhausen noise analysis requires the use of a Barkhausen noise signal analyzer (Rollscan) and sensor. The Rollscan 210 is a standalone handheld unit with no ethernet or USB connection, so it does not interface with data collection software such as ViewScan.

Performing Barkhausen noise measurements is a simple process:

Measurement area is magnetized with alternating magnetic field by the sensor
During magnetization the sensor measures the Barkhausen noise signal and transfers it to Rollscan
Real-time measured values are displayed on Rollscan

Technical Specifications

BN Rollscan 210 Technical Specifications
Measurement Channels:	1
Sensor Connector:	PPC14
Magnetizing Frequency Range:	1–500 Hz (sine wave)
Magnetizing Voltage:	0–16 Vpp, adjustable
Analyzing Filter Range:	70–200 kHz
Output Connectors:	Scope (X2): oscilloscope signal monitoring; Rec (X3): analog RMS voltage output; Sync (X4): oscilloscope sync; AUX (X5): limit relay output
Display:	LED bar graph + numerical readout (RMS, limit, magnetizing voltage)
Audible Alarm:	Adjustable buzzer triggered when measurement limit is exceeded
Input Voltage:	100–240 V AC, 50–60 Hz
Normal Power Consumption:	75 VA
Maximum Power Consumption:	100 VA (when batteries are empty)
External Dimensions:	16.06" x 5.51" x 12.36" (408 x 140 x 314 mm); handle radius R180 mm)
Weight:	13.23 lbs (6.0 kg); 16.53 lbs (7.5 kg) with batteries

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BN Rollscan 210

Analog Barkhausen Noise Signal Analyzer Designed For Basic On-site Measurements