7
Operating Precautions
Measurement Precautions
Observe the following to avoid electric shock and damage to the
instrument.
• Do not apply voltage to the input terminals (INPUT A and INPUT
B). Also, to avoid electrical accidents, only take measurements
after turning off the power to the circuit being measured.
• Do not allow voltage of 2 V DC or more to be applied to the TC
SENSOR jack.
• Never attempt to measure at a point where voltage is present.
In particular, be careful to avoid damaging the instrument from
inductor discharge when attempting to measure a transformer or
motor immediately after a temperature increase test or withstand-
voltage test.
• The input terminals incorporate a circuit protection fuse.
Measurement is not possible when the fuse is blown.
• In the 20 mΩ and 200 mΩ ranges, the test object can be loaded with
one watt or more. Also, in the 100 kΩ range and above, 10 volts or
more may be applied. Therefore, when measuring delicate
components, use the Low-Power Resistance Measurement mode.
• Allowable input voltage from an analog thermometer is 0 to 2 V
(between terminal contacts). Do not apply voltage exceeding this
range.
• Battery internal resistance cannot be measured with this instrument.
It will sustain damage. To measure battery internal resistance, we
recommend the HIOKI 3550, 3551 and 3555 BATTERY HiTESTERs
or the 3560 AC m
Ω HiTESTER.
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