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Megger MFT-X1 - Loop Test Options and Methods

Megger MFT-X1
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7.3.2 To check the lead null value
1. Open circuit then short circuit the test leads a few times.
2. Ensure the main display shows 0.00 Ω each time the leads are shorted.
NOTE : This may vary a little depending on the quality of the contact between the test leads.
7.3.3 To remove a test-lead null:
1. Press the TEST button.
2. The null icon in the bottom of the display and the null value should disappear.
7.3.4 To update a test-lead null value
1. Remove the test lead null value.
2. Repeat the lead null process in 7.3.1 above.
7.3.5 Lead null errors
Resistance too high
Only test-leads with a resistance of 9.99 Ω or less can be nulled. If you try to null test-leads with a higher resistance,
the instrument beeps and >9.99 Ω flashes on the display for three seconds.
Poor lead connection
If possible, use crocodile clips when shorting the leads together for nulling to ensure that you get a good connection.
Alternatively, push pointed test probes firmly into a good metal conductor, such as a coin.
Negative lead null values
After a lead set has been nulled the main display may show values of (less than) <0.00 Ω. This is common if the leads
are shorted together as the resistance may be just slightly lower than the nulled value.
It is displayed as below, and the value will flash.
Fig 16: Continuity lead null too low
However, if this happens on a circuit measurement then the null value should be double checked as the null value
may be significantly higher than the lead resistance. If the null value is too high the leads should be re-nulled.
To avoid null issues:
Ensure there is a good connection during the nulling process. Possibly use a piece of copper pipe or bar to join
the leads.
Repeat the test-lead process as described above. Check the test-leads for signs of damage.
Use a copper bar or piece of pipe to join the leads.
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MFT-X1
30
Continuity testing and resistance measurement

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