User Manual

AsindicatedinFigure5,inthisconguration,jumperwiresareconnectedbetween
terminalsC1andP1andbetweenterminalsC2andP2.Inaddition,testleadsconnect
oneoftheelectrodestoterminalC1andtheotherelectrodetoterminalC2.
Anothercongurationoption,whichisrecommendedforusewhenmeasuringsmall
resistances,istoconnectthepotentialterminals(P1andP2)directlytotheelectrodes
withseparatetestleads,thuseliminatingthejumperwires.Suchaconguration
eliminatesanyvoltagedropinthetestleadsduetocurrentowintheleadswhichwould
appearinserieswiththevoltagedropoccurringbetweentheelectrodesinthecaseof
thecongurationshowninFigure5.
TheresistancereadingdeterminedbytheH-4385willbeadirectmeasurementof
resistancecomprising2components;theresistance-to-earthcontributionofeach
electrode (which itself comprises 3 components (see the “3-Electrode Application”
sectionabove)andtheearth’sresistancebetweenthetwoelectrodes.
Maintenance & Calibration
Otherthanchangingthebatteries,theH-4385requiresnomaintenance.
Whenthe“LowBattery”indicatorlightsup(andremainsON)duringabalancing
procedure,thebatteriesshouldbereplaced.Theproceduretochangethe8
C-sizealkalinebatteriesintheunitisasfollows:
1) Removethe4screwsonthefrontpanelandliftthepaneloutoftheplastic
case.
2) Turnthepanelupsidedownandplaceonaclean(anddry)surface
3) Undothefourretainingclipsandremovethetwosetsof4oldbatteriesfrom
their holder tubes.
Figure5