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当前位置:f66永乐国际旗舰厅 » 行业动态 » 工程师你发现了ZDS2022示波器的波形死区吗?

工程师你发现了ZDS2022示波器的波形死区吗?

文章出处:深圳市连讯达电子技术开发有限公司 人气:-发表时间:2015-10-19 19:49:00

     没有什么是完美的,示波器也不例外。数字示波器一直有个厂家不愿提起的问题,恐怕很多老工程师也没太注意,那就是波形死区。我们通过数字示波器无法观察到波形流中所有波形,观察到的或许还不到1%。

      图1 死区时间

  TU1 SIQUSHIJIAN

  SHUZISHIBOQIZAIGONGZUOSHIZONGHUIXIANCAIJISHUJU,RANHOUZAIDUIZHEIXIESHUJUJINXINGCHULIHEXIANSHI,YOUYIDIANBIXULEJIE,NEIJIUSHISHIBOQISHUJUQUYANGSUDUYUANKUAIYUSHUJUCHULISUDU,SHIDETABUDEBUZAISHUJUCHULIQIJIANTINGZHIQUYANG,ZHEIYANGBIRANDAOZHISIQUt2NEIDESUOYOUBOXINGYINMEIYOUCAIJIERDIUSHI,SHIBOQIDEJIBENYUANLIRUTU2SUOSHI。

    图2 示波器原理

  TU2 SHIBOQIYUANLI

  YUSHIBOQISIQUSHIJIANDUIYINGDECANSHUSHISHIBOQIDEBOXINGSHUAXINLV,YOUJIAOBOXINGBUHUOLV,SHIBOQIZAITEDINGSHIJIBENXIADEBOXINGSHUAXINLVSHIKETONGGUOTrigger OutJIEKOUQUCEDE,SHIBOQIDEBOXINGSHUAXINLVYUEGAOYUEHAO。

  BOXINGSHUAXINLVF = 1/(t1+t2) (wfms/s)

  ZAITEDINGSHIJIDANGWEIXIA,BOXINGSHIJIANt1SHIQUEDINGDE,NEIMEBOXINGSHUAXINLVYUEGAO,JIUYIWEIZHEBOXINGSIQUSHIJIANYUEDUAN,LOUDIAODEBOXINGYUESHAO。LIRUDUIYUTGONGSIDEMSO4054ERYAN,TAZAISHIJIWEI50ns/divSHIJIXIA,BOXINGSHUAXINLVKEDADAOZUIGAO50kwfms/s,NEIMEMEIMIAODEBOXINGSHIJIANDENGYU50*10*50000 = 25ms,SIQUSHIJIANWEI975ms,GUERBOXINGSIQUGAODA97.5%,YONGHUGUANCHADAODEYOUXIAOBOXINGJINZHANQUANBUBOXINGDE2.5%。

    图3 50kwfms/s波形刷新率下观察的波形信息

  TU3 50kwfms/sBOXINGSHUAXINLVXIAGUANCHADEBOXINGXINXI

  ZLGDEZDS2022SHIBOQITONGYANGZAI50ns/divSHIJIXIA,BOXINGSHUAXINLVQUENENGDADAO330,000wfms/s,SHIMEIMIAOBOXINGSHIJIANZHANGDA231ms,YUETGONGSIMSO4054DE9.24BEI。YONGLIANGTAISHIBOQIGUANCHATONGYIGEXINHAO,SHIJIJUNDIAODAO200ns/divSHI,ZLGDEZDS2022NENGGENGDUANSHIJIANNEIFAXIANXINHAOYICHANG,DANSHIMSO4054QUEBUNENG。

  图4 330,000wfms/s波形刷新率下观察的波形信息

  TU4 330,000wfms/sBOXINGSHUAXINLVXIAGUANCHADEBOXINGXINXI

  RUJIN,RENGRANYOUXUDUOGONGCHENGSHIHAIJIXUYONGMONISHIBOQI,YINWEIMONISHIBOQIBUHUICUNZAIBOXINGSIQU,QUEYECUNZAIQITADEBUZU,BIRUWUFAZUOSHUJUTONGJIFENXI,WUFAJILUDENG,ZHEIYESHIMONISHIBOQIYONGHUYUELAIYUESHAODEYUANYIN。WEILEJIANSHAOBOXINGSIQUDUIXINHAOFENXIDEYINGXIANG,JIANYIZAIGOUMAISHIBOQISHIWUBIXUANZEGAOBOXINGSHUAXINLVDESHIBOQI。

  ERHENDUOSHIBOQIYONGHUWUBUGUANXINSHIBOQIDESHUAXINLVZHIBIAO,JINQIWOSIFAEZAIYUKEHUJIAOLIUSHI,HENDUOKEHUDUIZDS2022SHIBOQIJUYOU33WANCIZHEN/MIAODEGAOSHUAXINLVHENGANXINGQU,ZHEIYANGGAODESHUAXINLVDAODISHIZENYANGZUOCHULAIDENI?

  什么是波形刷新率?

  BOXINGSHUAXINLVYOUJIAOBOXINGBUHUOLV,ZHIDESHIMEIMIAOZHONGBOXINGSHUAXINDECISHU,BIAOSHIWEIBOXINGSHUMEIMIAO(wfms/s)。SHISHISHANG,SHIBOQICONGCAIJIXINHAODAOPINGMUSHANGXIANSHICHUXINHAOBOXINGDEGUOCHENG,SHIYOURUOGANGEBUHUOZHOUQIZUCHENGDE。YIGEBUHUOZHOUQIBAOKUOCAIYANGSHIJIANHESIQUSHIJIAN,MONIXINHAOTONGGUOADCCAIYANGLIANGHUABIANZHUANWEISHUZIXINHAOTONGSHICUNCHU,ZHENGGECAIYANGCUNCHUGUOCHENGDESHIJIANCHENGWEICAIYANGSHIJIAN。SHIBOQIBIXUDUICUNCHUDESHUJUJINXINGCELIANGYUNSUANXIANSHIDENGCHULI,CAINENGKAISHIXIAYICIDECAIYANG,ZHEIDUANSHIJIANCHENGWEISIQUSHIJIAN。SIQUSHIJIANNEI,SHIBOQIBINGMEIYOUJINXINGBOXINGCAIJI。YIGEBUHUOZHOUQIWANCHENGJIUHUIJINRUXIAYIGEBUHUOZHOUQI。BUHUOZHOUQIDEDAOSHUJIUSHIBOXINGSHUAXINLV,RUTU1.1ZHONGSUOSHI,BOXINGSHUAXINLV=1/(Tacq+Tdeat)。

    图5 示波器采样过程示意图

  TU5 SHIBOQICAIYANGGUOCHENGSHIYITU

  YINGXIANGBOXINGSHUAXINLVDEYINSUYOUNAXIE?

  CAIYANGSHIJIANHESIQUSHIJIAN

  RUTU5ZHONGSUOSHI,BOXINGSHUAXINLVWEITacq(CAIYANGSHIJIAN)HETdeat(SIQUSHIJIAN)DEDAOSHU,QIZHONGCAIYANGSHIJIANYOUSHIBOQIPINGMUDECAIYANGCHUANGGEJUEDING,YONGSHUIPINGSHIJIDANGWEICHENGYISHUIPINGFANGXIANGGESHU,DANGSHUIPINGSHIJIQUEDINGHOU,CAIYANGSHIJIANJIUHUIGUDING。

  ERSIQUSHIJIANSHIYOUSHIBOQIDECHULINENGLIJUEDINGDE,DANGSHIBOQIDUISHUJUCHULINENGLIBUZUSHI,JIUHUIDUICAIJIDEDASHUJUBUNENGJISHIJINXINGCHULI,SIQUSHIJIANJIUHUIBIANZHANG,SHUAXINLVJIUHUIJIANGDI;DANGSHIBOQIDUISHUJUDECHULINENGLIHENQIANGSHI,SIQUSHIJIANJIUHUIBIANDUAN,XIANGYINGSHUAXINLVJIUHUIHENGAO。YINCISIQUSHIJIANSHIYINGXIANGSHUAXINLVDEZHONGYAOYINSU。

  CHUFASHIYISHIJIAN

  ZENGDACHUFASHIYISHIJIANXIANGDANGYUBIANXIANGDIZENGJIALESIQUSHIJIAN,YINWEIZAISHIYIQIJIAN,CHUFADIANLUFENGBI,CHUFAGONGNENGZANTING,JISHIYOUMANZUCHUFATIAOJIANDEXINHAOBOXINGSHIBOQIYEBUHUICHUFA,SUOYIYEHUIYINGXIANGSHUAXINLV。DANCHUFASHIYISHIJIANBINGFEIZHISIQUSHIJIAN。

  DANGDUIDAZHOUQIZHONGFUBOXINGJINXINGCHUFASHI,YOUYUBOXINGZHONGCUNZAIHENDUOMANZUCHUFATIAOJIANDEBOXINGDIAN,DAOZHICHUFABOXINGBUWENDING,WEILEDEDAOWENDINGCHUFADEBOXING,WOMENKEYISHEZHICHUFASHIYISHIJIAN,SHIBOXINGMEICIDOUZAITONGYIGEDIANCHUFA,WENDINGXIANSHICHUFABOXING。RUTU1.2ZHONG,KEJIANGSHIYISHIJIANSHEZHIWEI》200nsDAN《600nsDEZHI。

    图6  触发释抑时间

  TU6  CHUFASHIYISHIJIAN

  GAIRUHEJISUANSIQUSHIJIAN?

  DUISHUAXINLVYOUZHONGYAOYINGXIANGDESIQUSHIJIANSHIRUHEJISUANCHULAIDENI?

  DANGBUZHUOYIGEMAIKUANZAI40ns~60nsDEYICHANGMAICHONGSHI,HESHIDESHUIPINGSHIJIDANGWEIKESHEZAI50ns/GE,CISHIZDS2022SHIBOQIJUYOU33WANCIZHEN/MIAODEBOXINGSHUAXINLV,YIWEIZHEMEICICHUFACAIYANGZHANYONGDEZONGBUHUOSHIJIANT=1s/330KHz=3.03us,ZEYOUXIAODECAIYANGSHIJIANWEI50ns/divX14(ZDS2022SHIBOQISHUIPINGFANGXIANGYOU14GEGE)=700ns。NEIMESIQUSHIJIANBAIFENBIWEI(3030-700)/3030=76.89%。

  BUHUOXIANGTONGDEYICHANGMAICHONG,ZAIXIANGTONGSHIJIDANGWEIXIA,RUOTSHIBOQIJUYOU50KZHEN/MIAODESHUAXINLV,ZEJIUYIWEIZHEMEICICHUFACAIYANGZHANYONGDEZONGSHIJIANWEI,T=1S/50KHz=20us,YOUXIAODECAIYANGSHIJIANWEI50ns/divX10(GAISHIBOQISHUIPINGFANGXIANGYOU10GEGE)=500ns,ZESIQUSHIJIANBAIFENBIWEI(20000-500)/20000=97.5%。

  SIQUSHIJIANYUEZHANG,BUHUODAOOUFAXINHAODEGAILVJIUHUIYUEDI,DANGXIAOGAILVYICHANGBOXINGCHUXIANZAISIQUSHIJIANSHI,SHIBOQIJIUBUHUIBUHUODAOGAIYICHANG,DUIXINHAODEDIAOSHIHUICHANSHENGHENDAYINGXIANG。

  ZDS2022SHIBOQIRUHENENGZUODAOGAOSHUAXINLV

  NEIMEWEISHENMEZDS2022SHIBOQINENGGOUZUODAOGAODA33WANCIZHEN/MIAODESHUAXINLVNI?SIQUSHIJIANDIZHI76.89%,BIYIBANSHIBOQI97.5%DESIQUSHIJIANJINGRANDILE21.13%!

   图7 波形合成器框图

  TU7 BOXINGHECHENGQIKUANGTU

  ZDS2022SHIBOQICAIYONGCHAODAGUIMOFPGAJINXINGBOXINGHECHENG,DOUSHIQUANYINGJIANJIASUCHULI;

  ZDS2022SHIBOQICAIYONGCHAODAGUIMOFPGAJICHENGBOXINGXIANCUN,ZONGXIANDAIKUANGAO,SHISHUJUCHULISHIJIANDADAJIANSHAO,QIECAIYONGLEDUOXIANCHENGBINGXINGCHULIDEFANGSHI;

  ZDS2022SHIBOQIDEBOXINGHECHENGQUANDOUCAIYONGYOUHUASUANFAJINXINGCHULI。

  总结

  SHIBOQIDESHUAXINLVZHIJIEJUEDINGLEBUHUOYICHANGMAOCIDENENGLI,ZHIYOUZHENZHENGZHANGWOLESHUAXINLVDEBENZHI,CAINENGZHENGQUERENSHISHIBOQIDESHUAXINLVZHIBIAO,ZDS2022SHIBOQIJUYOU33WANCIZHEN/MIAODESHUAXINLV,NENGKUAISUBUHUOBOXINGYICHANG,GAOXIAOSHIYONG!SHUOZAIDUO,YEBURUNINQINZICEYICE!


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