KYORITSU KEW SNAP Series - Measurement Categories

CAUTION
●Always make sure to check the function selector switch is set to an
appropriate position before starting measurement.
●Always make sure to insert the plug of each lead fully into the
appropriate terminal on the instrument.
●Be sure to set the function selector switch to the "OFF" position
after use. When the instrument will not be in use for a long period,
place it in storage after removing the batteries.
●Do not expose the instrument to the direct sun, high temperature or
dew fall.
●Use a cloth dipped in water or neutral detergent for cleaning the
instrument. Do not use abrasives or solvents.
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Measurementcategories(Over-voltagecategories)
Toensuresafeoperationofmeasuringinstruments,IEC61010establishes
safetystandards forvariouselectricalenvironments,categorizedasCAT I
toCATIV,andcalledmeasurementcategories.Higher-numbered
categories correspondtoelectricalenvironmentswithgreatermomentary
energy,soameasuringinstrumentdesignedforCATIIIenvironmentscan
enduregreatermomentaryenergythanonedesignedforCATII.
CAT.I :Secondaryelectricalcircuits connected to anACelectricaloutlet
throughatransformerorsimilardevice.
CAT.II:PrimaryelectricalcircuitsofequipmentconnectedtoanAC
electricaloutletbyapowercord.
CAT.III:Primaryelectricalcircuitsoftheequipmentconnected
directlytothedistributionpanel,andfeedersfromthe
distributionpaneltooutlets.
CAT.IV:The circuit from the service droptotheserviceentrance,
andtothepowermeterandprimaryover-currentprotection
device(distributionpanel).
Incoming wire
CAT.IV
Interior wiring
Transformer
CAT.I
CAT.II
CAT.III
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