HP-205A-Brochure 电路图.pdf

《HP-205A-Brochure 电路图.pdf》由会员分享，可在线阅读，更多相关《HP-205A-Brochure 电路图.pdf（2页珍藏版）》请在收音机爱好者资料库上搜索。

1、AUDIOSIGNALGENERATORS MODELS20S-AAND20S-AG TheModel20S-A STANDARDIZEDFREQUENCIESANDVOLTAGEINSTANTLYAVAILABLE OUTPUTIMPEDANCESSELECTEDBYSWITCH ATTENUATIONSYSTEMPROVIDES110DB.INIDB.STEPS FIVEWATTSOUTPUTWITHLESSTHAN I%DISTORTION FREQUENCYALWAYSACCURATEWITHOUTZEROSETTING OUTPUTMETERCALIBRATEDINVOLTSANDD

2、ECIBELS SEPARATEINPUTMETERAVAILABLEFORGAINMEASUREMENTS USES:TheHewlett-PackardAudioSignalGener- atorsaredesignedfortimesavingperformance. Thevariousfeatureshavebeenselectedwiththe aimtomaketheseinstrumentssuitableforac- curateandrapidmeasurementwork.Theyare excellentforgenerallaboratoryapplicationsb

3、e- causetheysupplya knownvoltageas well as a knownfrequencyatthecommonlyusedimped- ancelevels.Theyareparticuarlysuitablefor gainmeasurementsbecauseno auxiliaryappara- tusisrequired.Theyprovideanexcellentsource ofvoltagefordistortionmeasurementsbecause theirwaveformdistortionisverysmall. Themany newf

4、eaturesmaketheseinstrumentsadaptable tonumerousjobsintheaudiofrequencyfield. DESCRIPTION:TheModel205-Aconsistsofa Hewlett-Packardresistancetunedoscillatorin combinationwith anoutputmeter,attenuator, andanimpedancematchingsystem.TheModel 205-AGincludesinputmeterforgainmeasure- ments. Theaccompanyingb

5、lockdiagramshowsthear- rangementofthevariouscomponentsinthesys- tem.Theoscillatorhas a fivewattoutputwhiCh feedsdirectlyintoa500ohmlinewherethevolt- ageismeasured.Theamplitudeofthisvoltage canbesettoanyleveluptoplus 37decibels aboveonemilliwattbymeansoftheamplitude controlontheoscillator.Followingth

6、emeterare 1-101 RadioFans.CN 收音机爱 好者资料库 theattenuatorsanimpedancematchingtrans- formerisprovidedtomatchvariousimpedances. twoattenuators,oneproviding 100decibelsin 10decibelstepsandtheotherproviding10 decibelsinIdecibelsteps.Fromtheoutputot OSCILLATOR10008 .5wottoutput500-METERATTENUATOR 20-20,000c.

7、p ,liIOD8,teps 100B ATTENUATOA IOastepl MATCHING TRANSFORMER oOv Theoutputtransformerhasthesameinsertion lossforallimpedancesandtheoutputmeterIS arrangedtoreadtheoutputvoltageattheout- putterminals withthesystemloaded.An inter- nalloadisprovidedsotheattenuationsystem workscorrectlywhenthereisno exte

8、rnal load. Everyprecautionhasbeentakentomakethese signalgeneratorsprecision instruments.Special heavy mechanicalconstructionhasbeenused throughouttogiveassurancethattheaccuracy willbemaintainedinlong,hardervice. SPECIFICATIONS Mode1205-A FREQUENCYRANGE:Thefrequencyrangeis 20cpsto20,000cps. CALIBRATI

9、ON:The dialiscaibrateddirectly incyclesforthelowest range, 20cpsto200cps. A switchselectstherangeandindicatesthe propermultiplyingfactor.Eachrangecoversap- proximately270degreesonthe6112main dial. RangeIcovers20cpsto200cps;RangeL. covers200cpsto2,000cps;andRange3covers 2,000cpsto20,000cps.- STABILIT

10、Y:Undernormaltemperaturecondi- tionsthefrequencywilldriftlessthan2%over longperiodsoftime.Eachrangeisprovided with an internaladjustmentsothatI%accuracy maybemaintainedifrequired. OUTPUT:Fivewattsoutputwillbedeliveredto amatchedresistanceload. OUTPUTIMPEDANCES:Outputimpedancesot 50ohms,200ohms,500oh

11、ms,and5,000ohms areavailable.Allarecentertapped. FREQUENCYRESPONSE:Thefrequencyre- sponseofthesystembeyondtheoutputmeteris down 2.0db.at20cpsandIdb.at20,000cps. DISTORTION:ThedistortionislessthanI%at fulloutputatallfrequenciesabove30cps. HUMLEVEL:The hum levelis60db.belowthe outputvoltageorminus 90d

12、b.below zero level, whicheveristhelarger. OUTPUTMETER:Theoutputmeteriscalibrated directlyinvoltsat500ohmsandindb.abovea I mw. level (50 voltsandplus 37db.fullscale). OUTPUTATTENUATOR:Theoutputattenua- torprovidesI10db.inIdb.steps.It consistsot a 100db.attenuatorwith10db.stepsanda10 db.attenuatorwith

13、 Idb.steps. MOUNTINGTheinstrumentISavailableIn eitherrelay rackorcabinetmounting,thepanel size oneitherinstrumentis19x 101j.Thecabi- netmodelsaremountedinattractiveoakcabi- flets finishedtoharmonize withthepanels.The panelsarefinishedingraywrinkleenamelwith machineengraveddesignations. Model205-AG T

14、heModel205-AGisexactlysimilartothe Model205-Aexceptithas aninputmeterfor gainmeasurements. INPUTMETER:Theinputmeterhas arangeof minus 5db.toplus49db.basedon a I mw. level and500ohms.Themeterscaleiscalibrated from minus 5db.toplus 9db.anda multiplier switchaddsfrom zeroto40db.tothereading in5db.steps

15、.Themeterhas animpedanceof 5,000ohms. FREQUENCYRESPONSE:Theinputmeteris compensatedtohaveabout0.5db.riseat20kc sothatgainmeasurementswiththeModel 205-AGareaccurateto15kcandonlyabout 0.5db.inerrorat20kc. Pricesanddelivery informationareavailable on request. Thesedataaresubjecttochangewithoutnotice. Patentsappliedfor. December10,1940 I HEWLETT-PACKARDCO. 481PAGEMILLROAD PALO ALTO,CALIFORNIA RadioFans.CN 收音机爱 好者资料库