KYORITSU 2413F - Manual (Page 14)

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CAUTION
●Transformers jaws , especially their tips, have been precisely
adjusted to obtain maximum accuracy. Take sufficient care to
avoid shock, vibration or excessive force when handing the
instrument.
●When a foreign substance is stick in the jaw tips or they cannot
properly engage, the transformer jaws do not fully close. In such
a case, do not release the jaw trigger suddenly or attempt to
close the transformer jaws by applying external force. Make sure
that the jaws close by themselves after removing the foreign
substance or making them free to move.
●The maximum size of conductor that can be measured is approx.
68mm in diameter. An accurate measurement cannot be made
on a conductor larger than this, because the transformer jaws
cannot be fully closed.
●Frequency selector switch (9) is designed to select the 50/60Hz
and “WIDE”frequency ranges. For further details, refer to
section 5-4 for operation of the frequency selector switch.
●The transformer jaws may buzz when measuring large current.
This has no effect on the instrument's performance or safety.
(1) Set the function/range switch to the desired position. Do not exceed
the maximum allowable input current for the selected range.
(2) For normal measurement, press the jaw trigger to open the
transformer jaws and clamp onto one conductor only. See Figure
3. Earth leakage current or small current that flow through a
grounded wire can also be measured by this method. (Fig. 4)
If is recommended that the conductor is placed at the center of the
closed transformer jaws.
(3) To measure out of balance leakage current, clamp onto all
conductors except a grounded wire. The leakage current measure
will be indication on the display. (Fig.4&Fig.5)