Part 2

-444 Plug-In Assembly ConfigurationVALNER GND./SHIkLDSHIELD CONNLCTkllTO DEVICE UNUkRTEST I F I T ISA CONDUCTOR'-- ~Stt MEASUHtMENT ACCURACYCONSIDERATIONS" FOR DISCUSSION0 LOU V MOF WAGNkR CHUUNU.GUARDFigure 115. Options 0701071 . Connecting the ShieldExcitation Supply RequirementsThe strain gauge assemblies require that an external excitation voltage source be supplied.The excitation supply (Vs) should have enough output capability to drive allconnected gauges, since the assemblies switch the bridge measuring device and notthe gauges. This means that the gauges are connected to Vs at all times. See thespecifications table for more information.For best common mode noise rejection, the excitation supply should drive only oneassembly (10 channels) and should have floating output and low noise characteristics.One supply may be used for several assemblies if the strain gauges are mountedclose to each other on the specimen being tested. If gauges are mounted somedistance apart, use separate supplies.For best results, the excitation supply voltage output should be between 0.1 V and5.4V, with less than 1 mV of noise. The supply should be linear regulated, not aswitching supply.Using an External DVMIf desired, an external voltmeter such as the -hp- Model 3456A, can be used as theDVM in place of the internal 3497A DVM. The external DVM can be connected tothe HI COM, LO COM and GUARD COM terminals on the rear panel of the 3497Aor to the HIGH. LOW and GUARD terminals.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com