Part 2

Plug-In Assembly Configuration 389Relay Card ConfigurationBy using jumpers JMPl through JMPG, the TIC COMP jumper and resistors R27through R32, the relay card can be configured for a wide variety of operating modes.The following chart shows the function of each of these components and Figure 82shows their locations.I RELAY CARD - FUNCTIONS IREFTITLEFUNCTIONTIC COMP JUMPERSets the assembly for hardware or softwarethermocouple compensation. Set to NO TICCOMP position for software compensation.Set to TIC COMP position for hardwarecompensation.TREE SWITCH JUMPERS(JMPI ,2,3)Enables signals from the A decade andB decade relays to be passed to the treeswitch relay. Remove these jumpers whenyou don't want signals input to the 3497Amainframe.DECADE A TO DECADE BJUMPERS(JMP4,5,6)These jumpers connect decade A relayoutputs to decade B relay outputs. Removethese jumpers for four-wire ohmsmeasurements. With jumpers removed, Adecade output ONLY is available to theDVM (when tree switch is closed).A DECADE SERIESRESISTORS(R27,28,29)B DECADE SERIESRESISTORS(R30,31,32)Provide current limiting protectionfor A decade. Short these resistors (bysoldering the shorting pins) when makingtwo-wire ohms measurements on the Adecade.Provide current limiting protection for Bdecade. Short these resistors (by solderingthe shorting pins) when making two-wireohms measurements on the B decade.--Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com