Chapter II
Portable digital multimeter
17
1. GENERAL
INSTRUCTIONS
You have just acquired a 5000 count-portable digital multimeter and we thank you for your
confidence.
This instrument complies with the specification of EN publication 61010-1, concerning safety
requirements for electronic measuring apparatus. To get the best service from this instrument,
read carefully this user’s manual and respect the detailed safety precautions.
1.1. Precautions
and safety measures
1.1.1. Before
use
•
This instrument has been designed for use indoors:
- in an environment with pollution level 2,
- at an altitude of less than 2000 m,
- at a temperature between 0
°
C and 50
°
C,
- with relative humidity of less than 80 % up to 40
°
C.
•
It can be used for measurements on the following types of circuits:
-
Measurement category III for voltages no higher than 600 V (AC or DC)
in relation to the earth and between input terminals.
-
Measurement category IV for voltages no higher than 600 V (AC or DC)
in relation to the earth and between input terminals.
•
Definition of measurement categories :
CAT
I
: Measurement category I is for measurements performed on circuits not directly
connected to mains.
E.g.: protected electronic circuits
CAT
II
: Measurement category II is for measurements performed on circuits directly connected
to the low voltage installation.
E.g.: power supply to domestic appliances and portable tools.
CAT
III
: Measurement category III is for measurements performed in the building installation
E.g.: machine or industrial apparatus power supply.
CAT
IV
: Measurement category IV is for measurements performed at the source of the low-
voltage installation.
E.g.: energy inputs
∗
For your own safety, only use the measuring probes which have been delivered with the
instrument : they conform to the EN 61010-031 safety standard. Before use, check that
they are in good condition.
∗
The safety of any system incorporating this instrument is the responsibility of the system
assembler.
1.1.2. During use
∗
Never exceed the protection limit values indicated in the specifications for each type of
measurement.
∗
When the multimeter is linked to measurement circuits, do not touch unused terminals.
∗
When the scale of the value to be measured is unknown, check that the scale initially
set on the multimeter is the highest possible or, wherever possible, choose the
autoranging mode.
∗
Before changing functions, disconnect the test leads from the circuit under test.
