[S261C] DIY DC VOLT METER 04 C (A/D Converter Datasheet)
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작성자 보리차 쪽지보내기 메일보내기 자기소개 아이디로 검색 전체게시물 작성일15-01-26 23:14 조회13,159회 댓글6건첨부파일
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DATE : 2015-01-26 23:14:01
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판매글, 첨부된 사진만 보고 나름대로 추정하기를..
Intesil ICL7106/7136 같은 칩 사용하기엔 크기가 작은거 같고 (DIP Type기준 대략 5Cm정도)
PCB가 두장으로 나눠진거 보면 대충만든 제품같지는 않고, 궁금해서 일단구입 ^^;
분해,
예상대로 반대쪽 PCB에 모토롤라(지금은 onsemi와 freescale나눠짐) MC14433
3 1/2 Digit A/D Converter 가 자리잡고 있더군요
그리고, 7-Segments(FND)는 지금의 Rohm사 제품입니다, 그외 구성 부품들도 괜잖은것들입니다
핵심부품인 MC14433의 주요사양으로는 정확도 : +/- 0.05% of Reading +/- 1 Count,
여기서 0.05%라는 숫자만 보면 느낌이 잘 오지 않을거 같은대요,
이걸 달리 표현하면 1V 측정시 오차범위가 0.95V~1.05V 즉 5mV 오차범위라는 말입니다
ppm으로 환산하면 0.05 * 10,000 = 500ppm
쉽게, +/- 0~1999까지 표현, +/- 5mV(0.005V) 오차를 가진 테스트터기 한대 들어있다고 보시면 됩니다(실제로 6 1/2 멀티미터가 부착된 장비도 있습니다)
정확도라는게 사람마다, 환경마다 기준이 다르고, 측정범위도 다르므로 첨부된 Datasheet를 참고하시기 바랍니다
저의 기준이나 실용적인 면으로 보면 신뢰성높고 정확한 Voltage meter입니다
자료를 만들때, 회로를 그리고 사용법, 주의 사항을 상세히 올려드려야 하나
자체가 첨삭이 필요없는, 완제품 성격이고, 주말에 가정 대소사가 있어
내부 궁금증만 해소 하는걸로 마무리 하였습니다,
사용된 주요부품 Datasheet (항목/Parts/제조사)
FND, LA301VM, Rohm
http://www.datasheets360.com/pdf/-1015744478272588663
* 장미색(암적색) 아크릴로 마감하시면 상당히 이쁠거 같습니다
Programmable Precision References/TL431CLP/Motorola
http://pdf.datasheetcatalog.com/datasheet/motorola/TL431ID.pdf
Hex Buffer(inverting type)/TC4049BP/Toshiba
http://www.toshiba.com/taec/components2/Datasheet_Sync/201404/DST_TC4049BP-TDE_EN_57.pdf
BCD-to-Seven Segment Driver/TC4511/Toshiba
https://www.toshiba.com/taec/components2/Datasheet_Sync/200709/DST_TC4511BP-TDE_EN_71.pdf
주의사항 :
년식은 상당히 오래되어 보였습니다, 90년대쯤?
보관상태가 좋았는지 PCB 부식방지 처리가 새거처럼 유지 되어 있더군요
그 덕분에 PCB에 열을 가하면 끈적끈적해집니다, 살짝 짜증은 났지만,
만약, 이런 처리가 없었다면 PCB 산화가 상당히 진행되었을겁니다
분해 혹은 기타 작업시, 인두 열이 너무 높거나 반복적으로 가열하시면 패턴이 일어납니다,
주의하세요..
첫번째 사진은 실측입니다,
연결방법 : "캠딕" 님이 올려주신 자료 참고하세요, 저는 아직 전원도 못 넣어봤습니다..
http://www.manmullsang.com/bbs/board.php?bo_table=file&wr_id=2082
사용설명서가 없어도 첨부된 MC14433 Datasheet나 ICL7106 응용회로를 이용하시면
응용범위가 상당히 넓습니다, 시간을 두고 차근 차근 보세요.
요즘은 7-Segments(FND) 자리에 LCD를 사용하지만
소형 계측기에는 여전히 이런 A/D Converter가 사용됩니다
http://www.intersil.com/en/products/data-converters/precision-a-d-converters/integrating-display-output-a-d-converters/ICL7106.html
http://www.go-gddq.com/upload/2012-12/12121112382780.jpg
아래 링크는 저도 만들어보았습니다
http://cba.sakura.ne.jp/kit01/kit_023.htm
* 혹시 담배값으로 뭔가를 비교하는게 기분 나쁘게 들리시면 지적해주시기 바랍니다, 시정하겠습니다
* 1일 1갑에서 3일1갑으로 줄였습니다, 1주일 1갑을 목표로 조금씩 조금씩 줄이고있습니다, 응원해주세요~
* 사양을 보면 어떤 경우엔 %, 또 어떤 경우엔 ppm을 사용하는 경우가 있습니다, 아래 두가지만 알고 계시면 현란한 숫자 놀음에 현혹되지 않습니다.
% -> ppm = 곱하기 10,000, 즉 0.05%는 0.05 * 10,000 = 500ppm
ppm -> % = 나누기 10,000, 즉 10ppm은 10 / 10,000 = 0.001%
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보리차 님.
" DIY DC VOLT METER 04 C " 자세한 설명 잘 보았습니다.
응용하는데~ 많은 도움이 됩니다.
고맙습니다. 꾸벅~~
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