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:2004211210:(1977-),,,20054Apr.,2005252JournalofAstronauticMetrologyandMeasurementVol.25,No.2:1000-7202(2005)02-0046-04:TN911.23:A(,100076):,,,TheGroundingandShieldingTechnicalAnalysisontheMeasurementSystemofDelicacySignalWENShi2ren(TheFirstMetrologyandMeasurementInstituteofCASC,Beijing100076)AbstractSeveralgroundingmethodsusuallyusedinmeasurementsystemarediscussedandafewcon2clusionsongroundinginthedesignofdelicacysignalmeasurementsystemsamearegotten.Theshieldingtech2nologyrelatedtothegroundingisintroducedalso,andtheprinciplesshouldbefollowedindesignarepointedout.KeywordsDelicacysignalShieldingGrounding1,,V,,,,,2,,,,,,,,,,:,,,2.111,(),VA=(I1+I2+I3)Z1VB=(I1+I2+I3)Z1+(I2+I3)Z2VC=(I1+I2+I3)Z1+(I2+I3)Z2+I3Z3VAVBVCI1I2I3,VAVBVC,,ZI(L),R1=0.05,I31mA,VA50V,,,2.22,VA=I1Z1VB=I2Z2VC=I3Z3,,,,,,,,,,2.3,,,323742(b),:,,,(1MHz),,,;,,2.4,,4,:,,(a),(b)R2,R3,Zin,R4,R1,E2()R3R1+R2+ZinABVNVN=ZinZin+R2+R1R3R4+R3E24R4=0.01,R1=100,R2=1,R3=1,Zin=10k,E2=1mV,,VN=0.99mV,,E2R1ZinR3,VN,(CD),R,,,R3,VN;R3R1+R2+ZinRR4+R3,VN=ZinZin+R2+R1R3RE2R=1M,,VN=0.99nV,(),R,VN=0,,,,,,,3,:,,,(),84200555,,E1,E2,C5(a),E1E2,,5(b),E1E2,,,,B5(c),,6,,,,6,,:,;,,:4,,,,[1]..:,1987.[2].().:,2003.[3]..,2001(11):61-63.942