multifunction tester

[Former Sponsor TM]

Hi, Fluke testers are traditionally very quick in conducting a loop test. I can only assume that they don't cancel out electrical noise on a circuit like other testers do, hence the rapid test result.

I've done a bit of research and you are correct about the error code. You can also still read the loop impedance measurement obtained by using the directional arrows - the ERR5 message is purely informative to let you know there is electrical noise on the system.

I don't know of any other brands of equipment that give you this message. Fair enough, a Megger or Metrel may take longer to conduct a loop test but they do cancel out any interference electronically.

Sorry for lack of information/help. As we're not currently a Fluke distributor, we don't have access to their technical service manuals unlike other manufacturer's

Edit - Also were you carrying out the same loop test configuration with the Megger? 9/10, you can rid a test of electrical noise by conducting your loop test at a higher current (not the anti trip setting), but you'll now be prone to tripping RCD's if they are present in the circuit