Extech Instruments GX900 Manual

A SERVICE OF

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ExtechInstruments

6 GX900-EU-EN V1.6 4/14

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SAFETY

INTERNATIONALSAFETYSYMBOLS

Thissymbol,adjacenttoanothersymbolorterminal,indicatestheusermust

refertothemanualforfurtherinformation.

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This symbol, adjacent to a terminal, indicates that, under normal use,

hazardousvoltagesmaybepresent

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Doubleinsulation

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This symbol advises the user that the terminals so marked must not

be

connectedtoacircuitpointatwhichthevoltagewithrespecttoearthground

exceeds(forthisspecificinstrument)1000VACorVDC

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WARNING This symbol indicates a potentially hazardous situation, which if not

avoided,couldresultindeathorseriousinjury.

CAUTION This symbol indicates a potentially hazardous situation,

which if not

avoided,couldresultindamagetotheinstrument.

IEC1010OVERVOLTAGEINSTALLATIONCATEGORIES

OVERVOLTAGECATEGORYI

Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in which

measuresaretakentolimitthetransientover‐voltagestoanappropriatelowlevel.Examples

includeprotectedelectroniccircuits.

OVERVOLTAGECATEGORYII

EquipmentofOVERVOLTAGECATEGORYIIisenergy‐consumingequipmenttobesuppliedfrom

thefixedinstallation.Examplesincludehousehold,office,andlaboratoryappliances.

OVERVOLTAGECATEGORYIII

EquipmentofOVERVOLTAGECATEGORYIIIisequipmentinfixedinstallations.

 Note–Examplesincludeswitchesinthefixedinstallationandsomeequipmentforindustrialuse

withpermanentconnectiontothefixedinstallation.

OVERVOLTAGECATEGORYIV

EquipmentofOVERVOLTAGECATEGORYIVis foruseattheoriginoftheinstallation.Examples

includeelectricitymetersandprimaryover‐currentprotectionequipment.