Frequently asked questions

• Battery testing

  • How can I predict when I need to change a cell?
  • How important is inter-cell connection resistance?
  • How often should battery impedance testing be carried out?
  • Is it possible to carry out a discharge test on a battery while it is still on line?
  • Measuring the float voltage of cells is usually easy, but how useful are the results produced by thi
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• Current transformer (CT) testing

  • What’s the best and least disruptive way to go about check the condition of the CTs in our installat
  • How does FDS testing work?
  • Is test equipment readily available for carrying out FDS testing?
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• Installation testing

  • In addition to performing tests on power systems, my team and I are often asked to carry out routine
  • Do these testers have any facilities for working on three-phase systems?
  • Apart from the features routinely needed for installation testing, do multifunction instruments typi
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• Insulation resistance testing

  • How do I null my leads?
  • Why do I read a continuity value of 0.00 Ohms or a negative value?
  • Why I am reading > 199 MOhms?
  • What is PI?
  • Why does the battery symbol show on the continuity range?
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• Loop testing

  • What is the loop and why do we test it?
  • Why are there different types of loop test?
  • What is a 2-wire high current test?
  • What are the limitations of the high current test?
  • Why do I need to connect a neutral for a non-trip test?
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• PAT testing

  • Can I prevent the printer from cutting an extra piece of blank label?
  • Can I test 3-phase equipment?
  • Does my PAT need appliance testing?
  • How can I keep the size of printed labels to a minimum?
  • How can I test 110V appliances?
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• PowerSuite software

  • How can I find the version number of my PowerSuite?
  • Can I create additional users?
  • Does PowerSuite work on a mac?
  • How can I add a password to PowerSuite?
  • How can I change the company logo?
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• Sweep frequency response analysis

  • Are other electrical tests necessary if I perform SFRA?
  • Can I perform SFRA before oil filling a new transformer?
  • Can SFRA test results from different manufacturers' test sets be compared?
  • Do I have to perform electrical tests in a particular order?
  • Does ambient temperature affect SFRA readings?
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• Time Domain Reflectometry

  • Are there different TDRs for different cable types?
  • Are there limitations when testing a high resistance conductor next to a low resistance conductor (e
  • Can ARM be used on secondary concentric cables?
  • Can external signals affect a TDR test?
  • Can I perform a TDR test after a VLF test?
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• HV circuit breaker testing

  • Are pre-insertion resistors in parallel with the main circuit breakers contacts?
  • Are pre-insertion resistors left energized when a breaker is closed?
  • Are there any standards regarding circuit breaker testing?
  • Can I use circuit breaker testers to test 50/51 relays?
  • Can I use live tank breakers for a breaker and a half scheme?
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• Battery and product disposal

  • Battery and product disposal
  • How do I dispose of my Megger battery pack?
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