Cropico tester on track at train maintenance company
Bombardier Tra
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| DO7Plus Micro Ohmmeter |
The business unit incorporates the ‘Cropico DO7 Plus' high performance digital micro ohm meter into the testing and measurement of its electric DC and AC traction motors and vehicle earth integrity in order to improve reliability and unit availability.
Advanced component analysis and motor testing systems have been initiated by Bombardier which involves the DO7 Plus as part of the assessment to achieve enhanced motor performance.
Andrew Mills, technical electrical engineer at Bombardier, said: "The DO7 Plus is a highly capable, easy-to-use instrument, even in the harshest of environments, producing excellent test data to allow analysis of results and easy data collection and storage."
Applications:
• The DO7 is used to detect high resistive joints and open circuits on all motor types. The instrument is used to carry out Bar-bar resistance and equaliser winding integrity assessments on DC motor field coils, interpole coils, armature coils.
• The risk of fire resulting from a poorly performing axle earth return ‘high resistive joint' can be avoided by the use of the DO7 to check earth resistance through the axle and wheel interface.
• The instrument is also used for development work at Bombardier to analyse, assess and implement product improvements.
• The D07 Plus improves the accuracy to which low resistance can be measured, simplifying resistance associated with electrical connections, weld integrity, cable and joint resistance, electric motors and other engineering applications.
Andrew Mills adds: "It carries out all the required tests as well as we had hoped, and we are now looking at the possibility of buying further units for next year."
Features:
• Accurate to within 0.05%, lead resistance errors are eliminated with the incorporation of true four-wire technology, while advanced features include seven selectable measurement ranges, extending from 0.1μΩ to 6 kΩ - in addition to a 10A measuring current.
• Capable of recording and storing 1,000 measurements plus sequences. There is an option for selecting continuous or pulsed current output. A long scale count meter (up to 60,000) enables the automatic averaging of forward and reverse measurements, which can then be downloaded to a PC or printer if required via a full serial RS232 or USB outlet port.
• A QWERTY keyboard and LCD graphics panel have been incorporated to allow for quick and easy access and control. Other features include temperature compensation, full cooling curve facilities with built-in graphical plotting, remote start facility and comprehensive digital calibration.
• Remote power is provided by rechargeable batteries, which provide up to one hour's continuous use at the lowest ranges and 20 hours for all others. A mains cord is also supplied as standard together with test leads, user manual and instructional CD-ROM. Specialist test leads and calibration standards are also available from Cropico.
• The D07 Plus comes sealed in an impact-resistant, lightweight (5kg) and easy-to-carry ABS case capable of withstanding the harshest field conditions and is part of a comprehensive range of precision measurement instruments from Cropico, part of the Seaward Group.
