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Chapter II
18 Portable digital multimeters
Definition of installation categories :
CAT IV: Measurement category IV corresponds to measurements taken at the
source of low-voltage installations.
Example: power feeders
CAT III: Measurement category III corresponds to measurements on building
installations.
Example: industrial machinery or instrument power supplies
CAT II: Measurement category II corresponds to measurements taken on
circuits directly connected to low-voltage installations.
Example: household appliance and portable tool power supplies
CAT I: Measurement category I corresponds to measurements taken on
circuits not directly connected to the network.
Example: protected electronic circuits
1.2.1. Before use
Comply with environmental and storage conditions.
For your safety, before using the leads, systematically check they are is in
perfect working condition.
1.2.2. During use
A
s a safety measure, use only suitable leads and accessories supplied
with the instrument or approved by the manufacturer.
If the measurement category of the accessory is different from that of the
apparatus, the lowest category applies to the unit.
Never exceed the protection limit values indicated in the specifications for
each type of measurement.
Before changing the function, disconnect the measurement leads from the
circuit measured.
Never measure resistances on a live circuit.
When the instrument is connected to the measurement circuits, never touch an
unused terminal.
1.3. Safety features
It is impossible to access the battery or fuse compartment without first
disconnecting the measurement leads.
When measuring voltages greater than 30 V
DC or 60 VAC, the symbol
flashes on the display.
When measuring voltages above 7 A, the sign blinks on the display and
an intermittent audible signal warns the user.
When there is a persistent overload on following ranges, an intermittent buzzer
indicates the risk of electric shock : VLOW Z, VAC+DC, VDC, ADPDC, ADPAC+DC,
500 mADC (or 50 mADC : MX 24 and except MX 23), 500 mAAC+DC
(or 50 mAAC+DC : MX 24 and and except MX 23), 10 ADC, 10 AAC+DC
(except MX 23).
6


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