Continuity testing

[sidekick]

I have a Fluke 1653 and have been testing without problem for a couple of years with it.
However, I have just had it calibrated and therefore should not question readings.
But I appear to be quite often getting 0.0 as a continuity reading and it does not look correct.
Is there a problem with the fluke I should be aware of or is something i am doing wrong.
Latest reading was on 14m run of new 10mm t/e continuity reading 0.0?
and again on 5m run of new 2.5mm t/e?

Anyone any ideas or should I just record this on cert?

 

[Johno]

Just for piece of mind, have you tried testing a longer length of cable and maybe compare to OSG

 

[telectrix]

sounds like calibration is out. you should get some sort of positive reading even if it's only 0.01

 

[morph]

no its just that the cable is of low resistance and i suspect when you last nulled the leads you over compensated when hold the tips or clips together
take of the null and try again

 

[Golden_Boy]

I have a Fluke 1653 and have been testing without problem for a couple of years with it.
However, I have just had it calibrated and therefore should not question readings.
But I appear to be quite often getting 0.0 as a continuity reading and it does not look correct.
Is there a problem with the fluke I should be aware of or is something i am doing wrong.
Latest reading was on 14m run of new 10mm t/e continuity reading 0.0?
and again on 5m run of new 2.5mm t/e?

Anyone any ideas or should I just record this on cert?

Use a check box ...

 

[Amp David]

Sometimes got zero reading on my Megger 1552, but mostly displays the lowest reading of 0.02

 

[Amp David]

Check the cal cert you got. These have all the results on them, or they should have

 

[morph]

,most good testers , fluke and megger etc, should read to 0.01, but if nulled wrong that figure can will show as negative as well as zero

 

[Amp David]

In 4 years never seen 0.01 on my 1552, but never had any worries

 

[morph]

its not likely i know and i dont remember seeing it myself but it is true , if it didnt it would not meet the reqs of GN3 , its got to measure to 0.01 in order to measure .11
ie the resolution is 0.01

 

[Amp David]

Agree with you Morph. At first always worried about it but now just get on with it and record result

 

[morph]

whats a few .01 ohms here and there ?
we loose far more than that on resistances of screws and testing tips etc
i have had negative readings on a short large csa when i have not nulled the leads correctly, it depends how hard you press the clips together
i found with the megger the average reading of the leads is about 0.13 ohms so i have a roughy idea what to expect whenever i null the leads..

 

[Amp David]

Would agrre with the nulling. Must be pretty consistant as mine are always 0.14

 

[brucelee]

agree with amp david and morph my megger is the same 0.14

 

[i=p/u]

do yous dudes use you megger mft 1552 to pat test...... basic 2 test just, and would the mft give you 100mA soft test for computers