Manual Gossen Metrawatt METRAHIT 27EX (page 6 of 36) (English)

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6 GMC-I Messtechnik GMBH

– Measurements may only be performed within the indi-

cated ambient conditions. See page 29 for operating

temperature range and relative humidity.

– The instrument may not be used in a dusty atmo-

sphere.

– No maintenance operation may be performed in

potentially explosive atmospheres (cleaning, replace-

ment of batteries, opening the device, etc.)

Observe the following safety precautions:

• Type-tested Housing

The milliohmmeter may not be operated with open

housing.

In a potentially explosive atmosphere the housing may

not be opened. In this case, there is no protection

against explosions.

• Type-tested Batteries

Use the included or other type-tested batteries with

identical technical features only, see Characteristic Val-

ues.

Before use, please make sure that the housing cover is

closed. There is no protection against explosions when

the housing is open.

Batteries may only be replaced outside the potentially

explosive environment. No spare batteries may be

brought into the potentially explosive environment.

• Operation by qualified electricians

The instrument may only be operated by persons who

are capable of recognizing shock hazards and taking

the appropriate safety precautions. Shock hazards

exist anywhere, where voltages of greater than 33 V

(RMS) may occur.

• Shock Hazards

Avoid working alone when taking measurements

which involve shock hazards. Be certain that a second

person is present.

• Measurement Cables

Make sure that all measurement cables are in faultless

condition, e.g. undamaged insulation, no interruptions

in cables and plugs, etc.

• Unexpected Voltages

Be prepared for the occurrence of unexpected volt-

ages at devices under test (e.g. defective devices, after

inspecting the winding resistance of contactor relays,

etc.). For example, capacitors can still be dangerously

charged.

Perform measurements on voltage-free objects only.

• Type-tested Fuses (cannot be replaced by the user)

Only use type-tested fuses, as specified in the Charac-

eristic Values. There is no protection against explo-

sions when other fuses are used.

In order to prevent major damage to the instrument

when interference voltage is applied (within the admis-

sible limit values), the mmeasuring circuit is

equipped with a fuse F1 which makes these measur-

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Gossen Metrawatt METRAHIT 27EX Manual

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