Hioki 3290-10, Instruction Manual

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• Be sure to read the instruction manual for the clamp sensor to
be used before starting measurement.
• The hall element is used for the detector of the clamp-on sen-
sor. The hall element tends to drift with age or due to the ambi-
ent temperature. Keep this fact in mind when performing
measurement continuously.
❖
See "Sensor Temperature Characteristics" (page 58)
• Correct measurement may be impossible in the presence of
strong magnetic fields, such as near transformers and high-
current conductors, or in the presence of strong electromag-
netic fields such as near radio transmitters.
• The reading may show a measurement greater than the actual
value due to magnetic-field interference. The amount of inter-
ference varies depending on the sensor.
❖
See Section 6.3 "CLAMP ON AC/DC SENSOR Specifications" (page 116)
• The 9691 has a lock mechanism for the clamps so that the
clamps will not open due to vibration or other similar causes
during measurement. Lock the clamps as necessary. (If the
clamps should open even slightly during measurement, the
accuracy cannot be guaranteed.)
• Attach the clamp around only one conductor. Single-phase (2-
wire) or three-phase (3-wire) cables clamped together will not
produce any reading.
OK