Hi
I just bought a second hand metrotest mpat10
and it seems to work ok and i will be getting it recalibrated soon
my question is I tested the earth bond lead by connecting it to a plug earth pin inserted in the 240v test socket earth
so the tester was just testing its own earth bond lead ...(.I know probably not good practice )
and it came back with a reading of .03 ohms which i confirmed with my fluke low reading ohm meter
Now what i want to know is is this normal as the ohm reading seems to be correct for the earth test lead itself and if so do you then take .03 ohms off your lead calculations to allow for the meters own resistance of its own test lead
As any mains lead tested will actually be .03 higher than it actually is
has anyone else noticed this
it could be that my tester needs calibrating with an offset to cater for its own test lead resistance
or it just might be the way it works anyway so it will fail higher reading leads
i dont have any other information maybe someone out there knows the answer
I did try speaking to seaward as they do a similar meter\clone but they did not read my question properly and went on about lead length software that they could sell me
So i thought i would try here and maybe get a sensible answer
thanks for your time reading this and maybe you have an answer
I just bought a second hand metrotest mpat10
and it seems to work ok and i will be getting it recalibrated soon
my question is I tested the earth bond lead by connecting it to a plug earth pin inserted in the 240v test socket earth
so the tester was just testing its own earth bond lead ...(.I know probably not good practice )
and it came back with a reading of .03 ohms which i confirmed with my fluke low reading ohm meter
Now what i want to know is is this normal as the ohm reading seems to be correct for the earth test lead itself and if so do you then take .03 ohms off your lead calculations to allow for the meters own resistance of its own test lead
As any mains lead tested will actually be .03 higher than it actually is
has anyone else noticed this
it could be that my tester needs calibrating with an offset to cater for its own test lead resistance
or it just might be the way it works anyway so it will fail higher reading leads
i dont have any other information maybe someone out there knows the answer
I did try speaking to seaward as they do a similar meter\clone but they did not read my question properly and went on about lead length software that they could sell me
So i thought i would try here and maybe get a sensible answer
thanks for your time reading this and maybe you have an answer