Part 2

Plug-In Assembly Configuration 439SpecificationsSpecifications for the 120/350 ohm strain gaugetbridge completion assemblies follow.Specifications are performance standards, or limits, against which the assemblies maybe tested.OPTION 07010711201350 OHM. STRAIN GAUGEIBRIOGE COMPLETION ASSEMBLIESSensitivity vs. Supply VoltageBridae Tvlle V. = 100 mV V. = 1 volt V. = 5 voltsFull 0.5 pr 0.05 pr 0.01 prNo Manual Adjustmenta% 1 Cf 0.1 pc 0.02 prThe assemblv is used with an external suoolv .. . and e~ther the3497A voltmeter or an external 3456A voltmeter The initial 2 0.2 pr 0.04 pc Ivoltmeter readings for bridge excitation and brldge unbalance (GF = 2. System Voltmeter -. 3456A. For 34978are used by the system computer to solve the bridge equation. Voltmeter. multiply numbers by 101.eliminating the need for any span and offset adjustments. Tocompute straln, this assembly must be used in conjunct~onAccuracywlth a system computerThese specifications include all system-related errors: bridgeBridge ExcitationThe excitation voltage Vs IS always applied, never sw~tched, sothere are no errors due to the dynamic heating and cooling ofthe gauge. Slnce the exc~tation voltage is measured on eachstrain gaugelbr~dge card, the strain accuracy is independentof long-term supply voltage changes. An Inexpensive powersupply. such as the HP 6214A. is adequate to achieve theaccuracy specification shown. It also has enough currentcapability to provide power for up to 50 channels 15 cards).Excitation Supply Requ~rements:15 bridge conf~gurat~onlVs max: i 5.4 volts DCIs: 250 mA per 10 channels 1120 ohm gaugesl80 mA per 10 channels 1350 ohm gaugeslGeneral Information:Isolation Voltage: L 170 V peak between any termlnal and chasslsreslstor tolerance and drift. thermal offsets of bridge scannerand voltmeter, voltmeter accuracy, ~njected currents, selfheatlngof bridge rewtors and system noise. The only exceptionsare lead wire mlsmatch and the accuracy of the gauge itself.Specifications are valld for either the 3497A or the 3456A voltmeterwith integration time set to one power line cycle.Accuracy at VS = 5 voltsTemperatureBridge 24 Hr. 90 Day 590 Days CoefficientType f l'C 23 + 5'C 23 f 5'C 10-18,28.55°ClFull 1 pc 1 p< 0.04 pcIMo. 0.025 r