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The RCP2A is a compact milliohm meter designed to measure bonding resistance in aircraft structures. It ensures effective discharge of electric loads and protects against lightning strikes. With user-friendly interfaces and a wide range of accessories, it offers precise measurements and easy operation.
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RCP2A Marketing A division of Martek Power Group
Summary • Why measure bonding resistance ? • RCP2A Presentation • Customer targets • Competition analysis • RCP2A key points
The effects of lightning strikes ? • Lightning : a danger for planes! • On average every civil transport aircraft is struck by lightning in flight once a year • The risk of strikes by lightning is increased in rainy zones, at approximately 4000 meters and between -5°C and +5°C • During a strike by lightning, the lightning does not stop on the plane but sweeps it to continue its way in the atmosphere with a point of initial entrance and a point of final exit
Direct effects of lightningStrikes • They are caused by the effect of the discharge or by the conduction of the lightening strike current (up to 200 kA!) • Types of the damage: • Thermic with perforation of walls by fusion • Dynamic with rise of pressure which generates a destructive shock wave for the cabling and the dissimilar and composite materiels. • Electromagnetic which perturbs the on board equipment
Why measure the bonding resistance ? • A plane with a structure and a metal envelope (aluminium) constitutes an excellent protection against lightning strikes provided electric continuity is insured • Connection of dissimilar materials can cause a weakness in the electric conductivity and prevent the effective discharge of electric loads received by the plane • The bonding of these surfaces becomes indispensable and thus the control of this bonding and the continuity
RCP2A The milliohm meter RCP2A is a measuring device of resistances from 0,001 m to 6000 m with currents of 0.1 A, 1 A or 10 A. Presented in a fibreglass and resin polyester box of small dimensions (340x120x220 mm) with a weight of 4 kg, its ergonomics allows the user to use it either placed on the ground or across one’s shoulder or chest. A wide back-lit LCD display combined with an intuitive keyboard ensure simple and easy operation.
Specifications • RS232 interface • 1000 measures with 10A • Removable battery pack • Remote control at distance • Suite case • A wide range of accessories
Front panel Red/Green light LCD sreen Joystick Batteries Start/Stop Function keys Enter key Measure Measure terminals
Extraction handle RS232 socket Locking screw Charger socket Locking screw Block batteries’s front panel Measurement press button
Method of measure In order to make low resistance measurement with a high precision, the RCP2A uses the 4 wire Kelvin method. • 2 wires are used to connect a constant current source to the resistance to be measured • 2 additional wires are used to measure the difference of potential directly to the terminals of the device under test. • With this method, the resistance of the measuring leads does not introduce any error.
RCP2A Accessories (leads etc.) Bonding resistance +I RLead +U Ux Ic Rx -U Rx = Ux / Ic Kelvin Method RLead RLead RLead -I RLead = Lead resistance
RCP2A typical customers Manufacturers of civil and military aircrafts : • AIRBUS • BOEING • DASSAULT • EUROCOPTER • EMBRAER • FOKKERS
RCP2A typical customers The subcontractors • SOGERMA • TURBOMECA • HISPANO SUISA • INTERTECHNIQUE
RCP2A typical customers Aeronautical maintenance technicians : • AIR FRANCE • AIA • ARMY • LABINAL
RCP2A advantages • Measurement specifications • Ergonomics: small weight and volume • User friendly interfaces • Replaceable Batteries of big capacity • Measurement traceability through the SEQUENCE mode • Remote control with LCD display • RS232 interface with PC download/upload facility • Wide accessory range • Measurement up to 100 meters • Approval of the equipment by Airbus Toulouse and Nantes
AIRBUS list sites • FRANCE • Toulouse • Nantes • St Nazaire • Meaulte • GERMANY • Hamburg • Bremen • Varel • Nordenham • Stade • Buxtehude • Laupheim
AIRBUS list sites(2) • ENGLAND • Filton • Broughton • SPAIN • Getafe • Illescas • Puerto Real • Airbus Web site for additional information www.airbus.com/about/manufacturing.asg
November 2004 A division of the Martek Power group