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两种简单、准确、灵活的热电偶温度测量方法

JIANJIE

REDIANOUSHIYIZHONGGUANGFANYONGYUWENDUCELIANGDEJIANDANYUANJIAN。BENWENJIANDANGAISHULEREDIANOU,JIESHAOLELIYONGREDIANOUJINXINGSHEJIDEGUOCHENGZHONGCHANGJIANDETIAOZHAN,BINGTICHULIANGZHONGXINHAODIAOLIJIEJUEFANGAN。******ZHONGFANGANJIANGCANKAOJIEHEDIANBUCHANGHEXINHAODIAOLIJICHENGZAIYIGEMONI IC NEI,SHIYONGGENGJIANBIAN;DIERZHONGFANGANJIANGCANKAOJIEHEDIANBUCHANGHEXINHAODIAOLIDULIKAILAI,SHISHUZISHUCHUWENDUGANYINGGENGLINGHUO、GENGZHUNQUE。

REDIANOUYUANLI

RUTU 1 SUOSHI,REDIANOUYOUZAIYITOUXIANGLIANDELIANGGENBUTONGJINSHUXIANZUCHENG,XIANGLIANDUANCHENGWEICELIANG(“RE”)JIEHEDIAN。JINSHUXIANBUXIANGLIANDELINGYITOUJIEDAOXINHAODIAOLIDIANLUZOUXIAN,TAYIBANYOUTONGZHICHENG。ZAIREDIANOUJINSHUHETONGZOUXIANZHIJIANDEZHEIYIGEJIEHEDIANJIAOZUOCANKAO(“LENG”)JIEHEDIAN。*

ZAICANKAOJIEHEDIANCHUCHANSHENGDEDIANYAQUJUEYUCELIANGJIEHEDIANHECANKAOJIEHEDIANLIANGCHUDEWENDU。YOUYUREDIANOUSHIYIZHONGCHAFENQIJIANERBUSHI******SHIWENDUCELIANGQIJIAN,XU***ZHIDAOCANKAOJIEHEDIANWENDUYIHUODEZHUNQUEDE******WENDUDUSHU。ZHEIYIGUOCHENGBEICHENGWEICANKAOJIEHEDIANWENDUBUCHANG(LENGJIEHEDIANBUCHANG)。

欧洲杯直播REDIANOUYICHENGWEIZAIHELIJINGDUNEIGAOXINGJIABICELIANGKUANWENDUFANWEIDEGONGYEBIAOZHUNFANGFA。TAMENYINGYONGYUGAODAYUE+2500°C DEGEZHONGCHANGHE,RUGUOLU、RESHUIQI、KAOXIANGHEFENGJIYINQINGDENG。K XINGSHI***SHOUHUANYINGDEREDIANOU,BAOKUO Chromel®HE Alumel®(TEDIANSHIFENBIEHANGE、LV、MEIHEGUIDENIEHEJIN),CELIANGFANWEISHI–200°C ZHI+1250°C。

*WOMENSHIYONGSHUYU“CELIANGJIEHEDIAN“HE“CANKAOJIEHEDIAN”ERBUSHIGENGCHUANTONGDE“REJIEHEDIAN”HE“LENGJIEHEDIAN”。CHUANTONGMINGMINGTIXIKENENGHUILINGRENCHANSHENGKUNHUO,YINWEIZAIXUDUOYINGYONGZHONG,CELIANGJIEHEDIANKENENGBICANKAOJIEHEDIANWENDUGENGDI。

WEISHENMESHIYONGREDIANOU?

YOUDIAN

欧洲杯直播• WENDUFANWEIGUANG:CONGDIWENDAOPENQIYINQINGFEIQI,REDIANOUSHIYONGYUDADUOSHUSHIJIDEWENDUFANWEI。REDIANOUCELIANGWENDUFANWEIZAI–200°CZHI+2500°CZHIJIAN,JUTIQUJUEYUSUOSHIYONGDEJINSHUXIAN。

• JIANGUNAIYONG:REDIANOUSHUYUNAIYONGQIJIAN,KANGCHONGJIZHENDONGXINGHAO,SHIHEYUWEIXIANELIEDEHUANJING。

• XIANGYINGKUAI:YINWEITAMENTIJIXIAO,RERONGLIANGDI,REDIANOUDUIWENDUBIANHUAXIANGYINGKUAI,YOUQIZAIGANYINGJIEHEDIANLUOLUSHI。TAMENKEZAISHUBAIHAOMIAONEIDUIWENDUBIANHUAZUOCHUXIANGYING。

• WUZIFARE:YOUYUREDIANOUBUXUYAOJILIDIANYUAN,YINCIBUYIZIFARE,QIBENSHENSHIANQUANDE。

QUEDIAN

• XINHAODIAOLIFUZA:JIANGREDIANOUDIANYAZHUANHUANCHENGKEYONGDEWENDUDUSHUBIXUJINXINGDALIANGDEXINHAODIAOLI。YIZHIYILAI,XINHAODIAOLIHAOFEIDALIANGSHEJISHIJIAN,CHULIBUDANGJIUHUIYINRUWUCHA,DAOZHIJINGDUJIANGDI。

• JINGDUDI:CHULEYOUYUJINSHUTEXINGDAOZHIDEREDIANOUNEIBUGUYOUBUZHUNQUEXINGWAI,REDIANOUCELIANGJINGDUZHINENGDADAOCANKAOJIEHEDIANWENDUDECELIANGJINGDU,YIBANZAI 1°C ZHI 2°C NEI。

欧洲杯直播• YISHOUFUSHI:YINWEIREDIANOUYOULIANGZHONGBUTONGDEJINSHUSUOZUCHENG,ZAIYIXIEGONGKUANGXIA,SUISHIJIANERFUSHIKENENGHUIJIANGDIJINGDU。YINCI,TAMENKENENGXUYAOBAOHU;QIEBAOYANGWEIHUBIBUKESHAO。

• KANGZAOXINGCHA:DANGCELIANGHAOFUJIXINHAOBIANHUASHI,ZASANDIANCHANGHECICHANGCHANSHENGDEZAOSHENGKENENGHUIYINQIWENTI。JIAOHEDEREDIANOUXIANDUIKENENGDAFUJIANGDICICHANGOUHE。SHIYONGPINGBIDIANLANHUOZAIJINSHUDAOGUANNEIZOUXIANHEFANGHUKEJIANGDIDIANCHANGOUHE。CELIANGQIJIANYINGDANGTIGONGYINGJIANHUORUANJIANFANGSHIDEXINHAOGUOLV,YOULIYIZHIGONGPINPINLV(50 Hz/60 Hz)JIQIXIEBO。

REDIANOUCELIANGDENANDIAN

欧洲杯直播JIANGREDIANOUCHANSHENGDEDIANYABIANHUANCHENGZHUNQUEDEWENDUDUSHUBINGBUSHIJIANQINGSONGDESHIQING,YUANYINHENDUO:DIANYAXINHAOTAIRUO,WENDUDIANYAGUANXICHENGFEIXIANXING,XUYAOCANKAOJIEHEDIANBUCHANG,QIEREDIANOUKENENGYINQIJIEDIWENTI。RANGWOMENZHUYIFENXIZHEIXIEWENTI。

欧洲杯直播DIANYAXINHAOTAIRUO:***CHANGJIANDEREDIANOULEIXINGYOU J、K HE T XING。ZAISHIWENXIA,QIDIANYABIANHUAFUDUFENBIEWEI 52 µV/°C、41 µV/°C HE 41 µV/°C。QITAJIAOSHAOJIANDELEIXINGWENDUDIANYABIANHUAFUDUSHENZHIGENGXIAO。ZHEIZHONGWEIRUODEXINHAOZAIMOSHUZHUANHUANQIANXUYAOJIAOGAODEZENGYIJI。BIAO 1 BIJIAOLEGEZHONGREDIANOULEIXINGDELINGMINDU。

1. 25°C SHIGEZHONGREDIANOULEIXINGDEDIANYABIANHUAHEWENDUSHENGGAOGUANXI(SAIBEIKEXISHU)

YINWEIDIANYAXINHAOWEIRUO,XINHAODIAOLIDIANLUYIBANXUYAOYUE 100 ZUOYOUDEZENGYI,ZHEISHIXIANGDANGJIANDANDEXINHAODIAOLI。GENGJISHOUDESHIQINGSHIRUHESHIBIESHIJIXINHAOHEREDIANOUYINXIANSHANGDESHIQUZAOSHENG。REDIANOUYINXIANJIAOZHANG,JINGCHANGCHUANGUODIANQIZAOSHENGMIJIHUANJING。YINXIANSHANGDEZAOSHENGKEQINGSONGYANMEIWEIXIAODEREDIANOUXINHAO。

欧洲杯直播YIBANJIEHELIANGZHONGFANGANLAICONGZAOSHENGZHONGTIQUXINHAO。******ZHONGFANGANSHIYONGCHAFENSHURUFANGDAQI(RUYIBIAOFANGDAQI)LAIFANGDAXINHAO。YINWEIDADUOSHUZAOSHENGTONGSHICHUXIANZAILIANGGENXIANSHANG(GONGMO),CHAFENCELIANGKEJIANGQIXIAOCHU。DIERZHONGFANGANSHIDITONGLVBO,XIAOCHUDAIWAIZAOSHENG。DITONGLVBOQIYINGTONGSHIXIAOCHUKENENGYINQIFANGDAQIZHENGLIUDESHEPINGANRAO(1 MHz YISHANG)HE 50 Hz/60 Hz(DIANYUAN)DEGONGPINGANRAO。ZAIFANGDAQIQIANMIANFANGZHIYIGESHEPINGANRAOLVBOQI(HUOSHIYONGDAILVBOSHURUDEFANGDAQI)SHIFENZHONGYAO。50Hz/60Hz LVBOQIDEWEIZHIWUGUANJINYAO—TAKEYIYU RFI LVBOQIZUHEFANGZAIFANGDAQIHE ADC ZHIJIAN,ZUOWEI∑-Δ ADCLVBOQIDEYIBUFEN,HUOKEZUOWEIJUNZHILVBOQIZAIRUANJIANNEIBIANCHENG。

CANKAOJIEHEDIANBUCHANG:YAOHUODEZHUNQUEDE******WENDUDUSHU,XU***ZHIDAOREDIANOUCANKAOJIEHEDIANDEWENDU。DANG******CISHIYONGREDIANOUSHI,ZHEIYIBUZHOUTONGGUOJIANGCANKAOJIEHEDIANFANGZAIBINGCHINEILAIWANCHENG。TU 2 MIAOSHUYITOUCHUYUWEIZHIWENDU,LINGYITOUCHUYUBINGCHI(0°C)NEIDEREDIANOUDIANLU。ZHEIZHONGFANGFAYONGLAIXIANGJINMIAOSHUGEZHONGREDIANOULEIXINGDETEDIAN,YINCIJIHUSUOYOUDEREDIANOUBIAODOUSHIYONG 0°C ZUOWEICANKAOWENDU。TU 2. JIBENDETIE-KANGTONGREDIANOUDIANLU。

DANDUIYUDADUOSHUCELIANGXITONGERYAN,JIANGREDIANOUDECANKAOJIEHEDIANBAOCHIZAIBINGCHINEIBUQIESHIJI。DADUOSHUXITONGGAIYONGYIZHONGCHENGWEICANKAOJIEHEDIANBUCHANG(YOUCHENGWEILENGJIEHEDIANBUCHANG)DEJISHU。CANKAOJIEHEDIANWENDUSHIYONGLINGYIZHONGWENDUMINGANQIJIANLAICELIANG—YIBANWEI IC、REMINDIANZU、ERJIGUANHUO RTD(DIANZUWENDUCELIANGQI)。RANHOUDUIREDIANOUDIANYADUSHUJINXINGBUCHANGYIFANYINGCANKAOJIEHEDIANWENDU。XU***JINKENENGZHUNQUEDIDUQUCANKAOJIEHEDIAN—JIANGZHUNQUEWENDUCHUANGANQIBAOCHIZAIYUCANKAOJIEHEDIANXIANGTONGDEWENDU。RENHEDUQUCANKAOJIEHEDIANWENDUDEWUCHADOUHUIZHIJIEFANYINGZAI***ZHONGREDIANOUDUSHUZHONG。

KESHIYONGGEZHONGCHUANGANQILAICELIANGCANKAOJIEHEDIANWENDU:

1. 热敏电阻:响应快、封装小;但要求线性,精度有限,尤其在宽温度范围内。要求激励电流,会产生自发热,引起漂移。结合信号调理功能后的整体系统精度差。
2. 电阻温度测量器(RTD):RTD 更准确、稳定且呈合理线性,但封装尺寸和成本限制其应用于过程控制应用。
3. 远程热二极管:二极管用来感应热耦连接器附近的温度。调节芯片将和温度成正比的二极管电压转换成模拟或数字输出。其精度限于约±1°C。
欧洲杯直播4. 集成温度传感器:集成温度传感器是一种局部感应温度的独立 IC,应小心地靠近参考接合点安装,并可组合参考接合点补偿和信号调理。可获得远低于 1°C 的精度。电压信号非线性:热电偶响应曲线的斜率随温度而变化。例如,在 0°C 时,T 型热电偶输出按 39 µV/°C 变化,但在 100°C 时斜率增加至 47 µV/°C。

欧洲杯直播YOUSANZHONGCHANGJIANDEFANGFALAIDUIREDIANOUDEFEIXIANXINGJINXINGBUCHANG。XUANZEQUXIANXIANGDUIJIAOPINGHUANDEYIBUFENBINGZAICIQUYUNEIJIANGXIELVJINSIWEIXIANXING,ZHEISHIYIZHONGTEBIESHIHEYUYOUXIANWENDUFANWEINEICELIANGDEFANGAN,ZHEIZHONGFANGANBUXUYAOFUZADEJISUAN。K HE J XINGREDIANOUBIJIAOSHOUHUANYINGDEZHUDUOYUANYINZHIYISHITAMENTONGSHIZAIJIAODADEWENDUFANWEINEILINGMINDUDEDIZENGXIELV(SAIBEIKEXISHU)BAOCHIXIANGDANGHENGDING(CANJIANTU 3)。TU 3.REDIANOULINGMINDUSUIWENDUERBIANHUAZHUYI,CONG 0°C ZHI 1000°C,K XINGSAIBEIKEXISHUDAZHIHENGDINGZAIYUE 41 µV/°C。

LINGYIGEFANGANSHIJIANGCHAZHAOBIAOCUNCHUZAINEICUNZHONG,CHAZHAOBIAOZHONGMEIYIZUREDIANOUDIANYAYUQIDUIYINGDEWENDUXIANGPIPEI。RANHOU,SHIYONGBIAOZHONGLIANGGE***JINDIANJIANDEXIANXINGCHAZHILAIHUODEQITAWENDUZHI。

DISANZHONGFANGANSHIYONGGAOJIEDENGSHILAIDUIREDIANOUDETEXINGJINXINGJIANMO。ZHEIZHONGFANGFASUIRAN***ZHUNQUE,DANJISUANLIANGYE***DA。MEIZHONGREDIANOUYOULIANGZUDENGSHI。YIZUJIANGWENDUZHUANHUANWEIREDIANOUDIANYA(SHIYONGYUCANKAOJIEHEDIANBUCHANG)。LINGYIZUJIANGREDIANOUDIANYAZHUANHUANCHENGWENDU。REDIANOUBIAOHEGENGGAOJIEREDIANOUDENGSHIKECONGhttp://srdata.nist.gov/its90/main/HUODE。ZHEIXIEBIAOGEHEDENGSHIQUANBUJIYU0°C CANKAOJIEHEDIANWENDU。ZAICANKAOJIHEDIANCHUYURENHEQITAWENDUSHI,XU***SHIYONGCANKAOJIEHEDIANBUCHANG。

欧洲杯直播JIEDIYAOQIU:REDIANOUZHIZAOSHANGZAICELIANGJIEHEDIANSHANGSHEJILEJUEYUANHEJIEDILIANGZHONG******(TU 4)。

4.热电偶测量接合点类型。

SHEJIREDIANOUXINHAODIAOLISHIYINGZAICELIANGJIEDIREDIANOUSHIBIMIANJIEDIHUILU,HAIYAOZAICELIANGJUEYUANREDIANOUSHIJUYOUYITIAOFANGDAQISHURUPIANYADIANLIULUJING。CIWAI,RUGUOREDIANOU******JIEDI,FANGDAQISHURUFANWEIDESHEJIYINGNENGGOUYINGDUIREDIANOU******HECELIANGXITONGDIZHIJIANDERENHEJIEDICHAYI(TU 5)。TU5.SHIYONGBUTONG******LEIXINGSHIDEJIEDIFANGSHI。

DUIYUFEIGELIXITONG,SHUANGDIANYUANXINHAODIAOLIXITONGYIBANYOUZHUYUJIEDI******HELUOLU******LEIXINGHUODEGENGWENDINGDEBIAOXIAN。YINWEIQIKUANGONGMOSHURUFANWEI,SHUANGDIANYUANFANGDAQIKEYICHULI PCB(YINSHUADIANLUBAN)DIHEREDIANOU******DIZHIJIANDEJIAODAYACHA。RUGUOFANGDAQIDEGONGMOFANWEIJUYOUZAIDANDIANYUANPEIZHIXIACELIANGDIDIANYAYIXIADEMOUXIENENGLI,NEIMEDANDIANYUANXITONGKEYIZAISUOYOUSANZHONG******QINGKUANGXIAHUODEMANYIDEXINGNENG。YAOCHULIMOUXIEDANDIANYUANXITONGZHONGDEGONGMOXIANZHI,JIANGREDIANOUPIANYAZHIZHONGJIANLIANGCHENGDIANYAFEICHANGYOUYONG。ZHEIWANQUANSHIHEYUJUEYUANREDIANOUJIANDANHUOZHENGTICELIANGXITONGGELIDEQINGKUANG。DANSHI,BUJIANYISHEJIFEIGELIXITONGLAICELIANGJIEDIHUOLUOLUREDIANOU。

SHIYONGREDIANOUJIEJUEFANGAN:REDIANOUXINHAODIAOLIBIQITAWENDUCELIANGXITONGDEXINHAODIAOLIGENGFUZA。XINHAODIAOLISHEJIHEDIAOSHISUOXUDESHIJIANKENENGHUIYANZHANGCHANPINDESHANGSHISHIJIAN。XINHAODIAOLIBUFENCHANSHENGDEWUCHAKENENGHUIJIANGDIJINGDU,YOUQIZAICANKAOJIEHEDIANBUCHANGDUAN。XIALIELIANGZHONGJIEJUEFANGANKEYIJIEJUEZHEIXIEWENTI。******ZHONGFANGANXIANGXIJIESHAOLEYIZHONGJIANDANDEMONIJICHENGYINGJIANJIEJUEFANGAN,TASHIYONGYIGE IC JIANGZHIJIEREDIANOUCELIANGHECANKAOJIEHEDIANBUCHANGJIEHEZAIYIQI。DIERZHONGFANGANXIANGXIJIESHAOLEYIZHONGJIYURUANJIANDECANKAOJIEHEDIANBUCHANGFANGAN,REDIANOUCELIANGJINGDUGENGGAO,KEGENGLINGHUODISHIYONGDUOZHONGLEIXINGREDIANOU。

CELIANGFANGAN 1:WEIJIANDANERYOUHUA

TU 6 SUOSHIWEI K XINGREDIANOUCELIANGSHIYITU。TASHIYONGLE AD8495 REDIANOUFANGDAQI,GAIFANGDAQIZHUANMENSHEJIYONGYUCELIANG K XINGREDIANOU。ZHEIZHONGMONIJIEJUEFANGANWEISUODUANSHEJISHIJIANERYOUHUA:TADEXINHAOLIANBIJIAOJIANJIE,BUXUYAORENHERUANJIANBIANMA。

图 6.测量解决方案 1:为简单而优化。

ZHEIZHONGJIANDANDEXINHAOLIANSHIRUHEJIEJUE K XINGREDIANOUDEXINHAODIAOLIYAOQIUDENI?

欧洲杯直播ZENGYIHESHUCHUBILIXISHU:WEIRUODEREDIANOUXINHAOBEI AD8495 FANGDA 122 DEZENGYI,XINGCHENG 5-mV/°C DESHUCHUXINHAOLINGMINDU(200°C/V)。

JIANGZAO:GAOPINGONGMOHECHAFENZAOSHENGYOUWAIBU RFI LVBOQIXIAOCHU。DIPINLVGONGMOZAOSHENGYOU AD8495 DEYIBIAOFANGDAQILAIYIZHI。ZAIYOUWAIBUHOUZHILVBOQIJIEJUERENHECANYUZAOSHENG。

欧洲杯直播CANKAOJIEHEDIANBUCHANG:YOUYUBAOKUOYIGEWENDUCHUANGANQILAIBUCHANGHUANJINGWENDUBIANHUA,AD8495 XU***FANGZAICANKAOJIEHEDIANFUJINYIBAOCHIXIANGTONGDEWENDU,CONGERHUODEZHUNQUEDECANKAOJIEHEDIANBUCHANG。

FEIXIANXINGXIAOZHENG:TONGGUOXIAOZHUN,AD8495 ZAI K XINGREDIANOUQUXIANDEXIANXINGBUFENHUODE 5 mV/°C SHUCHU,ZAI–25°C ZHI+400°C WENDUFANWEINEIDEXIANXINGWUCHAXIAOYU 2°C。RUGUOXUYAOCIFANWEIYIWAIDEWENDU,ADI YINGYONGBIJI AN-1087JIESHAOLERUHEZAIWEICHULIQIZHONGSHIYONGCHAZHAOBIAOHUOGONGSHILAIKUODAWENDUFANWEI。

欧洲杯直播BIAO 2.JIEJUEFANGAN 1(TU 6)XINGNENGGAISHU

绝缘、接地和裸露热电偶的处理:图 5 所示为一个接地 1MΩ 电阻,它适用于所有热电偶******类型。AD8495 专门设计以在如图所示搭配单电源时测量地电压以下数百毫伏。如果希望更大地压差,AD8495 还可采用双电源工作。

AD8495 DEGENGDUOXIANGQING:TU 7 SUOSHIWEI AD8495 REDIANOUFANGDAQIDEKUANGTU。FANGDAQI A1、A2 HE A3(JISUOSHIDIANZU)YIDAOXINGCHENGYIGEYIBIAOFANGDAQI,TASHIYONGQIAHAOCHANSHENG 5 mV/°C SHUCHUDIANYADEYIGEZENGYILAIDUI K XINGREDIANOUSHUCHUJINXINGFANGDA。ZAIBIAOJI“Ref junction compensation”(CANKAOJIEHEDIANBUCHANG)DEKUANGNEISHIYIGEHUANJINGWENDUCHUANGANQI。ZAICELIANGJIEHEDIANWENDUBAOCHIWENDINGDETIAOJIANXIA,RUGUOCANKAOJIEHEDIANWENDUYOUYURENHEYUANYINERSHANGSHENG,LAIZIREDIANOUDECHAFENDIANYAJIUHUIJIANGDI。RUGUOWEIXINGFENGZHUANGDE(3.2 mm × 3.2 mm ×1.2 mm)AD8495 JIEJINCANKAOJIEHEDIANDEREQUYU,CANKAOJIEHEDIANBUCHANGDIANLUJIANGEWAIDIANYASHIJIADAOFANGDAQINEI,ZHEIYANGSHUCHUDIANYABAOCHIHENGDING,CONGERDUICANKAOWENDUBIANHUAJINXINGBUCHANG。

图 7. AD8495 功能框图。

BIAO 2 GAISHULESHIYONG AD8495 DEJICHENGYINGJIANJIEJUEFANGANDEXINGNENG:

CELIANGJIEJUEFANGAN 2:WEIJINGDUHELINGHUOXINGERYOUHUA

欧洲杯直播TU 8 XIANSHIGAOJINGDUCELIANG J、K HUO T XINGREDIANOUDESHIYITU。CIDIANLUBAOKUOYIGEXIAOXINHAOREDIANOUDIANYACELIANGYONGDEGAOJINGDU ADC,HEYIGECANKAOJIEHEDIANWENDUCELIANGYONGDEGAOJINGDUWENDUCHUANGANQI。LIANGGEQIJIANDOUYOUYIGEWAIBUWEICHULIQISHIYONG SPI JIEKOUJINXINGKONGZHI。

欧洲杯直播ZHEIZHONGPEIZHIRUHEMANZUQIANSHUXINHAODIAOLIYAOQIUDENI?

欧洲杯直播XIAOCHUZAOSHENGBINGFANGDADIANYA:RUTU 9 SUOSHI,SHIYONG AD7793 YIZHONGGAOJINGDU、DIGONGHAOMONIQIANDUANLAICELIANGREDIANOUDIANYA。REDIANOUSHUCHUJINGGUOWAIBULVBOHOULIANJIEDAOYIZUCHAFENSHURU AIN1(+)HE AIN1(–)。XINHAORANHOUYICIJINGGUOYIGEDUOLUFUYONGQI、YIGEHUANCHONGQIHEYIGEYIBIAOFANGDAQI(FANGDAREDIANOUXIAOXINHAO)FASONGDAOYIGE ADC,TAJIANGGAIXINHAOZHUANHUANWEISHUZIXINHAO。TU8.CELIANGJIEJUEFANGAN 2:WEIJINGDUHELINGHUOXINGERYOUHUA。

图 9. AD7793 功能框图。

BIAO 3.JIEJUEFANGAN 2(TU 8)XINGNENGGAISHUCANKAOJIEHEDIANWENDUBUCHANG:ADT7320(XIANGJIANTU 10)ZAICHONGFENKAOJINCANKAOJIEHEDIANFANGZHISHIZAI–10°C ZHI+85°C WENDUFANWEINEICANKAOJIEHEDIANWENDUCELIANGJINGDUKEDADAO±0.2°C。PIANSHANGWENDUCHUANGANQICHANSHENGYU******WENDUCHENGZHENGBIDEDIANYA,GAIDIANYAYUNEIBUJIZHUNDIANYAXIANGBIJIAOBINGSHURUZHIJINGMISHUZIDIAOZHIQI。GAIDIAOZHIQISHUCHUDESHUZIHUAJIEGUOBUDUANSHUAXINYIGE 16 WEIWENDUZHIJICUNQI。RANHOUTONGGUO SPI JIEKOUCONGWEICHULIQIHUIDUWENDUZHIJICUNQI,BINGJIEHE ADC DEWENDUDUSHUYIQISHIXIANBUCHANG。

欧洲杯直播XIAOZHENGFEIXIANXINGDU:ADT7320 ZAIZHENGGEEDINGWENDUFANWEI(–40°C ZHI+125°C)NEICHENGXIANCHUSEDEXIANXINGDU,BUXUYAOYONGHUXIAOZHENGHUOXIAOZHUN。YINERQISHUZISHUCHUKESHIWEICANKAOJIEHEDIANZHUANGTAIDEZHUNQUEBIAOSHI。

WEILEQUEDINGSHIJIREDIANOUWENDU,XU***SHIYONGMEIGUOGUOJIABIAOZHUNJISHUYANJIUYUAN(NIST)SUOTIGONGDEGONGSHIJIANGCICANKAOWENDUCELIANGZHIZHUANHUANCHENGDENGXIAOREDIANDIANYA。CIDIANYAYU AD7793 CELIANGDEREDIANOUDIANYAXIANGJIA,RANHOUZAICISHIYONG NISTGONGSHIJIANGHEZHUANHUANHUICHENGREDIANOUWENDU。

欧洲杯直播CHULIJUEYUANHEJIEDIREDIANOU:TU 8 SUOSHIWEIJUYOULUOLU******DEREDIANOU。CITIGONG***JIAXIANGYINGSHIJIAN,DANXIANGTONGDEPEIZHIHAIKEYIDAPEIJUEYUAN******REDIANOUYIQISHIYONG。

BIAO 3 GAISHULESHIYONG NIST SHUJU,JIYURUANJIANDECANKAOJIEHEDIANCELIANGJIEJUEFANGANDEXINGNENG:

TU 10. ADT7320 GONGNENGKUANGTU。

FULU

SHIYONG NIST GONGSHIJIANG ADT7320 WENDUZHUANHUANCHENGDIANYAREDIANOUCANKAOJIEHEDIANBUCHANGJIYUYIXIAGUANXI:QIZHONG:

ΔV = 热电偶输出电压
V @ J1 = 在热电偶接合点处产生的电压
V @ J2 = 在参考接合点处产生的电压

欧洲杯直播YAOSHIZHEIZHONGBUCHANGGUANXISHENGXIAO,CANKAOJIEHEDIANDELIANGGEDUANZIXU***WEICHIZAIXIANGTONGDEWENDU。WENDUJUNHENGSHISHIYONGYIGEDENGWENDUANZIKUAISHILIANGGEDUANZIDEWENDUXIANGTONG,TONGSHIBAOCHIDIANQIGELI。

欧洲杯直播ZAICELIANGCANKAOJIEHEDIANWENDUHOU,XU***JIANGQIZHUANHUANCHENGDENGXIAODEREDIANDIANYA,TAZAIJIEHEDIANCHUYUCELIANGWENDUXIASHICHANSHENG。YIZHONGFANGFASHISHIYONGMIJISHUDUOXIANGSHI。REDIANDIANYAJISUANRUXIA:QIZHONG:

E = 热电电压(毫伏)
an = 热电偶类型相关的多项式系数
T = 温度(°C)
n = 多项式阶数

欧洲杯直播NIST FABUMEIYIZHONGREDIANOUDEDUOXIANGSHIXISHUBIAO。ZHEIXIEBIAOBAOKUOXISHULIEBIAO、JIESHU(DUOXIANGSHIDEXIANGSHU)、MEIGEXISHULIEBIAODEYOUXIAOWENDUFANWEIHEWUCHAFANWEI。MOUXIELEIXINGREDIANOUYAOQIUDUOGEXISHUBIAOYIHANGAIZHENGGEWENDUCAOZUOFANWEI。MIJISHUDUOXIANGSHIBIAOZAIZHENGWENZHONGLIECHU。


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