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Discuss Varying continuity readings in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. pig
    Offline

    pig EF Member

    Location:
    Tenby
    Hi all,
    I am using a Fluke 1662 with fused test leads. I find when doing continuity tests such as R1+R2, as the test button is being held the result fluctuates dramatically. Both increasing and decreasing. Seems to happen on insulation resistance as well however not so much. I also find after zeroing the leads with the Fluke zeroing adaptor, I press the test button again with the leads still in the adaptor and get a reading between 0.20 and 0.80 ohms.
    Used a Megger before and never came across this.

    Regards.
     
  2. buzzlightyear
    Offline

    buzzlightyear still kicking sand, before pushing up daisies . Electrician's Arms

    Location:
    star command
    Bad allergator clips ?or leads
    Ring up fluke and ask the Tec dept .
     
    • Agree Agree x 2
  3. pig
    Offline

    pig EF Member

    Location:
    Tenby
    I did sway towards this as I don't seem to get it when using the plug top test lead. Just wondering if anyone had experienced something similar before
     
  4. buzzlightyear
    Offline

    buzzlightyear still kicking sand, before pushing up daisies . Electrician's Arms

    Location:
    star command
    Not me always used a megger .have cut my teeth on them .what do the manual tell you for problems.
     
  5. pig
    Offline

    pig EF Member

    Location:
    Tenby
    Not a lot really. Says how to zero the leads etc but that's about it
     
  6. Midwest
    Offline

    Midwest Electrician's Arms

    Location:
    Oxfordshire
    I had similar with a megger, even with replacment leads. Was a dodgy terminal, which required repair.
     
    • Like Like x 1
  7. suffolkspark
    Offline

    suffolkspark Electrician's Arms

    Location:
    suffolk
    If it doesnt do it with your plug in lead... Then its your leads lol, if you want a good set of leads and croc clips at the moment theres some new RS phase rotation meters on ebay for about £21.99 delivered

    Item no. 223214624444

    Its unlikely youll get a set of leads and crocs at that price alone
     
  8. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    When my Metrel does this, its time to buy new leads .........
     
    • Like Like x 1
  9. Pete999
    Offline

    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    You mean Crocerdile clips don't you Buzz? sorry Mate just messing with your head no malice intended
     
  10. ChrisElectrical88
    Offline

    ChrisElectrical88 Forum Mentor

    Location:
    Norwich
    Leads or clips or even batterys. I go through 3 or 4 pair of leads a year.
     
    • Like Like x 1
  11. Jim_e_Jib
    Offline

    Jim_e_Jib Regular EF Member

    Location:
    Devon
    I remember reading somewhere, possibly on this forum, that the Fluke fused probes can be a bit temperamental. If you're dead testing, you could try the non fused probes and see if the results are any different. If they are, perhaps the fuses and contacts need a bit of a clean.
     
  12. PEG
    Offline

    PEG Forum Mentor

    Location:
    Manchester
    Any capacitance on the installations you are testing?
    Are the symptoms identical,when leads are reversed?
     
  13. Vortigern
    Offline

    Vortigern Electrician's Arms

    Location:
    England
    Business Name:
    F.H. Electrical
    I have had this problem but with an old meter. If I left it in the vehicle overnight it would be very variable on low ohms readings. Keep it in the warm and dry no problem. Obviously condensation problems in my case.
     
    • Like Like x 1
  14. Andy5678
    Offline

    Andy5678 Electrician's Arms

    Location:
    Scotland
    I think I may have the same sort of issue as vort. If I blow into the connections of the leads and the MFT the resistance of the leads drops from around 0.30 to 0.10 and I get much more accurate readings. Moving about the cable at the ports also helps too. I also change leads regulary and have the same problems each time . Calibration is also done every year.
     
  15. static zap
    Offline

    static zap Regular EF Member

    Location:
    west midlands
    Different metals ,and slight temperature differences -that will disappear with time when plugged in . Can make any DC measurements drift ... milivolts !
    (Not sure if MFT is using AC ?)
     
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