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High flying ohmmeter solves aircraft corrosion threat

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The Royal Netherlands Air Force is using a high performance Cropico ohmmeter  as an  integral part  of a maintenance programme designed to identify and reduce the potential for airframe corrosion on front line fighter aircraft.

Air  force technicians are using the Cropico DO4000 digital ohmmeter to  measure the ground points on its fighter jets and Apache and Chinook.

These  ground  points are located at various key points around the airframe  and the  DO4000  enables technicians to quickly and easily check that the resistance levels between each one are lower than <2.5milliOhm.

Ground  points  are  required  to create a safe  electrical  network  inside  an aircraft – when it flies through dry air it gets statically charged, so when  it lands this needs to be safely discharged through the ground.

After  that,  the  ground  personnel can maintain the  aircraft  safely.  It  is important that these ground points have specific standards because, for example, when  refuelling  the  aircraft there could be spark-ignition  due  to  residual charge.  Also  the  ground  points take care of the different  currents  running throughout the airframe during flight.

The  DO4000 was supplied by Cropico's Netherlands test and measurement  equipment distributors, Total Test & Measurement Support.

A  spokesperson  for  the Royal Netherlands Air Force said:  "The  DO4000  is  an excellent instrument, offering superb performance, reliability and accuracy.

"It's  met  the air force's need for an easy to use tester and has fulfilled  all expectations,  particularly impressing as it is being  used  within  a  demanding testing environment."

The DO4000 has also received its NATO stock number – 6625-17-923-9744.

The  portable  and rugged instrument includes a number of advanced  features  to ensure  measurement  accuracy including forward and reverse current  measurement with  auto  averaging,  true current zero, long scale length  and  a  selectable measurement range from 40m to 4k with respective resolutions between 10 and 1.

Within the range, model 4001 also includes temperature compensation, with preset coefficients for copper and aluminium plus user settable coefficients for  other materials.  Temperature  measurement over  the  range  -50  to  +800ºC  is  also available.

Protection  up  to  415V rms is provided at the measurement terminals  and  push button  operation is achieved easily by clearly marked function controls. Direct reading measured values are displayed on a four-digit LCD display.

Over  range  and  low  battery  indication is also  provided  and  warning  LEDs illuminate when an open circuit lead condition is detected.


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