Kyoritsu Electrical Instruments Works KEW 4506, Instruction Manual

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Note
● As shown in Fig. 6-5, the phase of test voltage applied to
a neutral wire (N) changes 180-degree depending on the
orientation of the test voltage injection clamp. KEW 4506
performs socket test based on the polarity (phase difference)
of the test voltage signal; therefore, if the orientation of test
voltage injection clamp is incorrect, KEW 4506 judges as [NE
Reverse] even if the tested socket is correctly wired.
Fig. 6-5
[NE Reverse] [correctly wired]
● It is impossible to test ungrounding system (floating power
supply) which is mainly utilized in hospital, sound room, and
UPS (Uninterruptible Power Supply) because test voltage
cannot be applied to.
Po
w
er
su
pp
ly
KEW8343
Fig. 6-6