User Manual

8 GMC-I Gossen-Metrawatt GmbH
Safety Precautions
1 Safety Features and Precautions
You have selected an instrument which provides you with a high
level of safety.
This instrument fulfills the requirements of applicable European
and national EC directives. This is confirmed by means of the
CE mark. A corresponding declaration of conformity can be
requested from GMC-I Gossen-Metrawatt GmbH.
The TRMS digital multimeter has been manufactured and tested
in accordance with the following safety regulations:
IEC 61010–1:2001 / DIN EN 61010–1/VDE 0411–1:2002.
When used for its intended purpose (see page 10), safety of the
operator, as well as that of the instrument, is assured. Their safety
is however not guaranteed, if the instrument is used improperly or
handled carelessly.
In order to maintain flawless technical safety conditions, and to assure
safe use, it is imperative that you read the operating instructions
thoroughly and carefully before placing your instrument into service,
and that you follow all instructions contained therein.
The multimeter is equipped with an automatic socket blocking
mechanism for your safety, and in order to safeguard your
instrument. This mechanism is linked to the rotary switch and only
allows access to those jacks which are actually required for the
selected function. It also prevents the user from turning the rotary
switch to impermissible functions after the measurement cables
have already been plugged in.
The METRAHIT E
SPECIAL multimeter does not have a fuse for the current
measuring range. It’s designed for measurements in current transformer
circuits and is approved for measuring category 600 V CAT II.
Measuring Categories and their Significance per IEC 61010-1
The measuring category and the maximum rated voltage which
are printed on the device apply to your measuring instrument, for
example 1000 V CAT III.
Observe the following safety precautions:
• The multimeter may not be used in potentially explosive
atmospheres.
• The multimeter may only be operated by persons who are ca-
pable of recognizing contact hazards and taking the appropriate
safety precautions. Contact hazards according to standard
exist anywhere, where voltages of greater than 33 V RMS or
70 V DC may occur. Avoid working alone when taking meas-
urements which involve contact hazards. Be certain that a sec-
ond person is present.
• Maximum allowable voltage between the voltage measuring
terminals, and between all connections and earth is 1000 V for
measuring category III, or 600 V for measuring category IV.
The METRAHIT E
SPECIAL variant is an exception.
CAT Definition
I
Measurements in electrical circuits
which are not directly connected to the mains:
for example electrical systems in motor vehicles and aircraft, batteries etc.
II
Measurements in electrical circuits
which are electrically connected to the low-voltage mains:
with plugs, e.g. at home, in the office or laboratory etc.
III
Measurements in building installations:
stationary power consumers, distributor terminals, devices connected
permanently to the distributor
IV
Measurements at power sources for low-voltage installations:
meters, mains terminals, primary overvoltage protection devices