KYORITSU 6010B - Manual (Page 22)

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WARNING
Do not connect phase to phase as this instrument is rated at 230V.
7.5 Loop impedance at 3 phase equipment
Use the same procedure as in 7.4 above ensuring that only one phase is
connected at a time i.e.:
First Test: red lead to phase 1, black lead to neutral, green lead to earth.
Second Test: red lead to phase 2, black lead to neutral, green lead to earth etc.
WARNING
NEVER CONNECT THE INSTRUMENT TO TWO PHASES AT THE
SAME TIME.
Testing as described in 7.4 and 7.5 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 lead should be connected
to the neutral of the system i.e.: the same point as the black neutral lead.
If the system has no neutral then you must connect the black neutral lead to the
earth i.e.: the same point as the green earth lead. This will only work if there is
no RCD in this type of system.
Note: Before commencing the test, please clearly eliminate the load which
remains in the circuit to be tested, otherwise it may affect the accuracy of
the measurement.
Fig 11