EoW January 2013

Feature Testing & measuring

Solving answers to twisted pair wires Twisted pair wires are used in signal-/control-/network- and fieldbus cables. The degree of twisting is defined by the length of lay, or the twisting angle. The lay length (Snom) of the paired wires influences the electrical and mechanical characteristics. If the lay length deviates from the nominal value, various quality relevant defects appear. If those defects are noticed by the customer, expensive callback activities will result and controlling the lay length within the production line or rewinding station helps to avoid such actions. For controlling the lay length, Roland Electronic offers a method independent from the kind of cable jacket, suitable for unshielded cables, performable within the production line or the rewinding station: Detection of defects with eddy current encircling coil. For detecting defects a special eddy current encircling coil is used, through which the cable is led. The eddy current signals from the material are processed and evaluated in the control unit SND40. In case of deviation of twisting, the control unit reports

this directly to the machine controls. The inspection is not influenced by running high voltage inspection. Defect monitoring: Speed – 0.2...6m/s, detection threshold – deviations > 0.5 Snom*, basic condition, length of defect > 0.5 Snom* * lay length

Further possible applications are: Monitoring of the homogeneity of the shielding meshwork, inspection for homogeneity of strands, detection of weldings and cable joints and detection of material changes (eg of heating cables). Roland Electronic GmbH – Germany Website : www.roland-electronic.com Digital inline profile projector Geokon KJM GmbH in Germany has developed a new high-precision 2-D profile inline measurement system named Geokon. Four sensors acquire four images of the object and the data is then analysed on computer by image processing software. ▲ ▲ Detection of defects with eddy current encircling coil

Rectangular and complex profiles can be measured. The profile types can be entered as CAD-data in the DXF file format using the “Teach-In” program. With the “Teach-In” program, new products can be defined very simply. The technical drawing must be saved in DXF-format and entered into the “Teach-In” program. Then the measurement parameters are defined, as in CAD programs, by entering dimensions, creating a name (eg R15), defining tolerance or intervention levels and saving the parameters. For a new measurement, only the article to be measured must be selected. The results are displayed numerically as well as graphically. An exclusively numerical display of important dimensions in large numbers can be selected. Values outside of tolerance are highlighted in colour. Measurement results are saved, printed or transferred to computer-aided production data acquisition PDA- or QM-systems, according to customer requirements.

KJM GmbH – Germany Website : www.kjm-ag.de

▲ ▲ Geokon from KJM GmbH

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January 2013