UNI-T UT90B, Operating Manual

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Rules For Safe Operation (1)
Warning
To avoid possible electric shock or personal injury,
and to avoid possible damage to the Meter or to the
equipment under test, adhere to the following rules:
l
Before using the Meter inspect the case. Do
not use the Meter if it is damaged or the case (or
part of the case) is removed. Look for cracks or
missing plastic. Pay attention to the insulation
around the connectors.
l
Inspect the test leads for damaged insulation
or exposed metal. Check the test leads for
continuity. Replace damaged test leads with
identical model number or electrical specifications
before using the Meter.
l
When using the test leads, keep your fingers
behind the finger guards.
l
Do not apply more than the rated voltage, as
marked on the Meter, between the terminals or
between any terminal and grounding.
l
When the Meter working at an effective voltage
over 60V in DC or 30V in AC, special care should
be taken for there is danger of electric shock.
l
Use the proper terminals, function, and range
for your measurements.
l
The rotary switch should be placed in the right
position and no any changeover of range shall
be made during measurement is conducted to
prevent damage of the Meter.
l
Disconnect circuit power and discharge all high-
voltage capacitors before testing current,
resistance, diodes or continuity.
l
Replace the battery as soon as the battery
indicator appears. With a low battery, the Meter
might produce false readings that can lead to
electric shock and personal injury.
Model UT90B: OPERATING MANUAL
6