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MegohmmeterModels6501/6503
1.1 International Electrical Symbols
This symbol signifies that the instrument is protected by double or
reinforced insulation.
This symbol on the instrument indicates a WARNING and that the
operator must refer to the user manual for instructions before
operating the instrument. In this manual, the symbol preceding
instructions indicates that if the instructions are not followed, bodily
injury, installation/sample and product damage may result.
Risk of electric shock. The voltage at the parts marked with this
symbol may be dangerous.
In conformity with WEEE 2002/96/EC
1.2 DenitionofMeasurementCategories
CAT I: For measurements on circuits not directly connected to
theACsupplywalloutletsuchasprotectedsecondaries,
signallevel,andlimitedenergycircuits.
CAT II: For measurements performed on circuits directly
connectedtotheelectricaldistributionsystem.Examples
are measurements on household appliances or portable
tools.
CAT III: For measurements performed in the building installation
atthedistributionlevelsuchasonhardwiredequipmentin
xedinstallationandcircuitbreakers.
CAT IV: For measurements performed at the primary electrical
supply (<1000V) such as on primary overcurrent protec-
tiondevices,ripplecontrolunits,ormeters.
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