User manual

GMC-I Messtechnik GmbH 7
Safety Precautions
1 Safety Features and Precautions
You have selected an instrument which provides you with high
levels of safety.
This instrument fulfills all requirements of applicable European and
national EC directives. We confirm this with the CE mark. The rel-
evant declaration of conformity can be obtained from GMC-I
Messtechnik GmbH.
The TRMS digital multimeter has been manufactured and tested
in accordance with the following safety regulations:
IEC 61010–1:2010 / DIN EN 61010–1/VDE 0411–1:2011. When
used for its intended purpose (see page 9), safety of the operator,
as well as that of the instrument, is assured. Their safety is how-
ever not guaranteed, if the instrument is used improperly or han-
dled 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 mech-
anism 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 (exception: the voltage jack is open during current mea-
surement, but a visible red ring warns the user of possible incor-
rect connection). The socket blocking mechanism also prevents
the user from turning the rotary switch to impermissible functions
after the measurement cables have already been plugged in.
If dangerous voltages are applied in the high-impedance voltage
measuring functions (switch position V or PQ), switching to low-
impedance measuring functions (switch position MHz, , conti-
nuity, temperature or capacitance) causes “HiVoLt” to appear at
the display and the respective measurement is disabled.
Hazardous contact voltages are not detected when the ohm or
capacitance measurement is selected.
If the instrument switches itself off in the event that hazardous
contact voltage is applied (only possible during memory mode
operation), the high-voltage warning symbol remains visible at the
display.
Measuring Categories and their Significance per IEC 61010-1
The measuring category and the associated maximum rated volt-
age which are printed on the device apply to your measuring
instrument, e.g. 600 V CAT III.
Refer to section 10.2 regarding use of the measurement cables.
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 the standard
exist anywhere, where voltages of greater than 33 V TRMS or
70 V DC may occur. Avoid working alone when taking mea-
surements which involve contact hazards. Be certain that a
second person is present.
CAT Definition
I
Measurements in electrical circuits which are not directly connected to the
mains, e.g. electrical systems in motor vehicles and aircraft, batteries etc.
II
Measurements in electrical circuits which are directly connected to the low-
voltage mains via plug, e.g. in household, office and laboratory applications etc.
III
Measurements in building installations: Stationary 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