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CAUTION
• Take sufficient care not to apply shock, vibration or excessive force to the jaw tips. Otherwise,
precisely adjusted transformer jaws will be damaged.
• This instrument performs self-calibration for about 3 seconds when it is turned on. (“ “ is
displayed on the LCD.) Do not clamp onto any conductor or open the jaws during this procedure.
Inaccurate measurements may occur.
• For accurate measurements, ensure that the jaw tips are free from foreign substances, align properly,
and fully close. Do not release the jaw trigger abruptly or attempt to close the transformer jaws by
applying external force.
• The jaw opening allows for a maximum conductor diameter of 1.25". Accurate measurements cannot
be made on a larger conductor since the jaws will not fully close. Never attempt to apply excessive
force to close the jaws.
• When measuring large current, the transformer jaws may buzz. This is normal and has no effect on
the instrument's performance or safety.
• The instrument's transformer jaws are highly sensitive. Because of the characteristics of the
transformer jaws, it is impossible to eliminate the interference of an external magnetic field
completely. If there is a large magnetic field nearby, the display will not zero before clamping onto a
conductor. In this case, use the meter at a location as far as possible from the magnetic field.
Typical generators of magnetic fields include conductors with large currents flowing, motors,
electromagnetic equipment, integrated wattmeters.
7. Measuring method
DANGER
• Never make measurements on a circuit in which the electrical potential exceeds 300VAC.
• Transformer jaws are made of metal and their tips are not completely insulated.
Guard against the possible shorting where the equipment under test has exposed metal parts.
• Do not use the instrument in the presence of flammable gas, dust or vapor.
• Never make measurements with battery cover removed.
• Do not measure currents over 30A. Transformer jaws may overheat, causing a fire, deforming of
plastic parts or degrading of insulation. If “ “ is displayed on the LCD, stop measuring
immediately and remove the instrument from the conductor under test.
ND 5417-1 61-920 Ins 9/26/06 8:49 AM Page 12