Megger Limited PWS / Nov 06
DET4TC/R Launch
18
Don’t underestimate the power of “ART”
Even if the test current flowing through the electrode under test is less than 5% of the
total current generated by the DET4TC you can still get an idea of the electrode’s
resistance. Should this happen the instruments display will show the “clamp low”
indication as follows.
So if you take a reading of the complete system in standard 3P mode you know that
the electrode you were trying to test is at least 20 times that. Usually enough
information to make a decision. In addition you can also measure the standing
leakage current in each individual electrode. The DET4TC with ICLAMP is a flexible
addition to your testing ‘toolkit’.
Let’s imagine we were trying to measure the resistance of an earth path ‘A’ above.
Then using ICLAMP the low current symbol, shown above, appeared on the display.
In this instance we cannot use ART. You should still perform a standard 3-pole
measurement on the complete system.
Test
oint
C
P
Parallel earth paths
on any earth system
A
B
C
Internal earth path
Any Building
installation
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