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3 Initialisation
Page3.6
4wireswiring:
Youhavetochoosetheinputchanneltype2,3or4wiresinthe Channel setup function.
3.4.4.Measureof intensity
Isolatedinputmodule: itispossibletomeasureintensitieswithashunt betweentheredandblack
terminalsoftheconsideredinput.
Non-isolateddifferentialinputmodule:itispossibletomeasureintensitieswithashunt between
the"+"and"-"terminalsoftheconsideredinput.
Inthiscase,choosethe "Current"typeamongtheparametersoftheconsideredchannel.
Connectthemeasurecablestotheterminalsoftheshunt.
CollectedresultsaredirectlydisplayedinAmperesormilli-Amperesaccordingtotherangeofthe
consideredchannel.
3.4.5.Connectionofthegrounding
Formeasuringvery smallvoltages,problemsofspuriousvoltagesfromelectromagneticfieldsor
commonmodevoltagessbecomeallthemoreimportantthantheselectedsensibilityishigher.Thus,
itisimportantthattheouterwiringismadecorrectly.
Causesforsuchdifficultiesarevarious:
-uncertaintyaboutthetrueoriginsoftheperturbingvoltagesandimpedanceswhentheyare
generated
-uncertaintyaboutthespuriouscapacitancesofthecircuitsandwiring
-noaccesstotheinjectionpointofthecommonmodevoltageofthenetworkthatprovides
the signaltoregister
-non-conformityofsomeapplianceswiththecurrentnorms
-sometimesevenignoranceofthesourceimpedancesofthe signaltoregister
YOUSHOULDABIDEBYTHEFOLLOWINGINSTRUCTIONS
1/ The mechanicalground ofeveryappliances shouldbelinkedtothe earth.
Themechanicalgroundoftherecorderislinkedtotheearththroughthemainscable.
However,iftheotherappliancesinthe systemarenotequippedthesameway,you dbettergather
theirmechanicalgroundwiththegroundoftherecorder:youcanaccessitthroughaunionlinerat
therearoftheappliance.
PT100