KYORITSU 6011A - Manual (Page 22)

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Fig 9
6.5 Loop impedance at 3 phase equipment
In order to test the Loop impedance at 3 phase equipment the optional OMA
DIEC(Model7133) is necessary.
Use the same procedure as in 6.4 above ensuring that only one phase is
connected at a time i.e.：First Test: red prod to phase 1, black prod to neutral,
green crocodile clip to earth.
Second Test: red prod to phase 2, black prod to
neutral, green crocodile clip to earth etc.
WARNING ：N EVE R CON N ECT TH E I NSTR U M E NT 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.