Kewtech KT62 Instruction Manual page 22

Loop impedance WARNING
tests
Never connect the instrument to two phases at the same time.
Testing as described in 6.4 and 6.5 above will measure the Phase-Earth
loop impedance. If you wish to measure the Phase-Neutral loop
impedance then the same procedure should be followed except the earth
clip should be connected to the neutral of the system i.e.: the same point
as the black neutral probe.
If the system has no neutral then you must connect the black neutral probe
to the earth i.e.: the same point as the green earth clip. This will only work
if there is no RCD in this type of system.
Note : 200Ω Loop range
This range uses complex sampling and averaging routines. Therefore if the
circuit under test changes in value during the period when the unit is
plugged in for test, the resulting measurement displayed will be the
average of all values. If the reading between successive test button presses
changes significantly the resulting displayed value may be inaccurate.
Fig 9
Black Red phase
neutral
Green
earth
Fig 10
20