{"id":2980,"date":"2018-02-12T22:20:47","date_gmt":"2018-02-12T21:20:47","guid":{"rendered":"http:\/\/www.crowave.com\/blog\/?p=2980"},"modified":"2018-02-13T02:27:03","modified_gmt":"2018-02-13T01:27:03","slug":"digitalni-multimetar-schlumberger-7040","status":"publish","type":"post","link":"https:\/\/www.crowave.com\/blog\/2018\/02\/12\/digitalni-multimetar-schlumberger-7040\/","title":{"rendered":"Digitalni multimetar Schlumberger 7040"},"content":{"rendered":"<p>Danas je nabavljen digitalni multimetar Schlumberger 7040 iz 1976. godine. Schlumberger je dio me\u0111unarodne grupe sa tvrtkama u vi\u0161e zemalja, te isti ovaj proizvod mo\u017ee na prednjoj plo\u010di imati ispisana imena i nekih drugih tvrtki. Prema natpisima na prednjoj plo\u010di ovaj na\u0161 primjerak je mogu\u0107e proizveden u Francuskoj (fran. ARRET &#8211; isklju\u010deno) gdje\u00a0Schlumberger tako\u0111er ima svoju tvrtku, no zbog jednostavnosti mi \u0107emo ovaj na\u0161 multimetar u daljnjem tekstu jednostavno zvati generi\u010dkim nazivom DMM 7040.<\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_02.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2981\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_02-1024x768.jpg\" alt=\"dmm_schlumberger_7040_02\" width=\"1024\" height=\"768\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_02-1024x768.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_02-300x225.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_02-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>DMM 7040 ima slijede\u0107a mjerna podru\u010dja:<\/p>\n<ul>\n<li>istosmjerni napon: 10 \u00b5V &#8211; 1000 V<\/li>\n<li>izmjeni\u010dni napon: 10 \u00b5V &#8211; 700 V RMS<\/li>\n<li>elektri\u010dni otpor: 0,1 \u2126 &#8211; 11 M \u2126<\/li>\n<li>istosmjerna struja: 1 nA &#8211; 1A<\/li>\n<li>HF &#8211; mjerenje struje preko RF sonde<\/li>\n<\/ul>\n<p>Naravno, rangiranje opsega je automatsko, a tako\u0111er funkcionira i prepoznavanje polariteta priklju\u010denog napona. Strujni mjerni opsezi (\u00b5A i HF) za\u0161ti\u0107eni su osigura\u010dem od prevelike struje na ulaznim stezaljkama.<\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_04.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2983\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_04-1024x543.jpg\" alt=\"dmm_schlumberger_7040_04\" width=\"1024\" height=\"543\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_04-1024x543.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_04-300x159.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_04-768x408.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Sa zadnje strane nalazi se priklju\u010dak za mre\u017eno napajanje i otvori trimera za kalibraciju. Tako\u0111er, dolje lijevo nalaze se priklju\u010dnice za mjerne kablove paralelne onima na prednjoj plo\u010di. Kad se skine mali poklopac koji se nalazi dolje u sredini ispod natpisne plo\u010dice dobije se pristup 7-pinskom konektoru. Preko ovih priklju\u010dnica i konektora mogu se na DMM 7040 spojiti razni dodaci predvi\u0111eni specijlano za ovaj multimetar, uglavnom za pro\u0161irenje mjernih opsega instrumenta.<\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_03.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2982\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_03-1024x663.jpg\" alt=\"dmm_schlumberger_7040_03\" width=\"1024\" height=\"663\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_03-1024x663.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_03-300x194.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_03-768x497.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Elektronika za DMM 7040 smje\u0161tena je na tri tiskane plo\u010dice.<\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_05.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2984\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_05-1024x711.jpg\" alt=\"dmm_schlumberger_7040_05\" width=\"1024\" height=\"711\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_05-1024x711.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_05-300x208.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_05-768x533.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_06.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2985\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_06-1024x768.jpg\" alt=\"dmm_schlumberger_7040_06\" width=\"1024\" height=\"768\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_06-1024x768.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_06-300x225.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_06-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_10.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2989\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_10-1024x520.jpg\" alt=\"dmm_schlumberger_7040_10\" width=\"1024\" height=\"520\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_10-1024x520.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_10-300x152.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_10-768x390.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_11.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2990\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_11-1024x494.jpg\" alt=\"dmm_schlumberger_7040_11\" width=\"1024\" height=\"494\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_11-1024x494.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_11-300x145.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_11-768x370.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_07.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2986\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_07-1024x643.jpg\" alt=\"dmm_schlumberger_7040_07\" width=\"1024\" height=\"643\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_07-1024x643.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_07-300x188.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_07-768x482.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Srce instrumenta 7040 \u010dini specijalizirani mikrokontroler MP954B. U njegovoj blizini nalazimo kristal frekvencije 404 kHz koji se nalazi u krugu tranzistorskog oscilatora 404 kHz. Ovaj signal zatim dolazi na binarni djelitelj kojeg \u010dine integrirani krugovi 7474 i 7400 gdje se ulazna frekvencija dijeli sa 4 nakon \u010dega se poja\u010dava i dobije takt frekvencije 101 kHz za upravlja\u010dki ritam mikrokontrolera MP954B. \u00a0MP954B sadr\u017ei u sebi sve potrebne algoritme za obradu ulaznih signala na osnovu polo\u017eaja sklopke za odabir vrste mjerenja, od automatskog rangiranja svakog opsega do upravljanja svim segmentima LED pokaziva\u010da za prikaz izmjerenih vrijednosti i LED indikatorima vrste mjerenja. Tako\u0111er, upravljanje relejem kao i gotovo sve A\/D konverzije ulaznih signala vr\u0161e se unutar mikrokontrolera MP954B (dio A\/D konverzije za mikrokontroler obavljaju operacijska poja\u010dala spojena kao integratori i komparatori).<\/p>\n<p>Iz podataka o mjernim podru\u010djima vidjeli smo da je DMM 7040 vrlo osjetljiv instrument pa na njegovim plo\u010dicama vidimo mno\u0161tvo operacijskih poja\u010dala koja su za svaki opseg spojena kao ulazna poja\u010dala, chopper poja\u010dala za istosmjerne mjerne opsege (njih smo opisali u objavi kkkk), izlazna poja\u010dala, poja\u010dala za odvajanje, integratori, komparatori i drugo. Tu su zatim izvori referentnih napona potrebni za rad pojedinih operacijskih poja\u010dala, filtri, sklopovi za za\u0161titu te elementi ispravlja\u010da i napajanja svih sklopova instrumenta.<\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_14.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2993\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_14-1024x478.jpg\" alt=\"dmm_schlumberger_7040_14\" width=\"1024\" height=\"478\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_14-1024x478.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_14-300x140.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_14-768x359.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_09.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2988\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_09-1024x798.jpg\" alt=\"dmm_schlumberger_7040_09\" width=\"1024\" height=\"798\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_09-1024x798.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_09-300x234.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_09-768x599.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_13.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2992\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_13-1024x779.jpg\" alt=\"dmm_schlumberger_7040_13\" width=\"1024\" height=\"779\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_13-1024x779.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_13-300x228.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_13-768x584.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_08.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2987\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_08-1024x768.jpg\" alt=\"dmm_schlumberger_7040_08\" width=\"1024\" height=\"768\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_08-1024x768.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_08-300x225.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_08-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_12.jpg\" rel=\"lightbox[2980]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2991\" src=\"http:\/\/www.crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_12-1024x776.jpg\" alt=\"dmm_schlumberger_7040_12\" width=\"1024\" height=\"776\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_12-1024x776.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_12-300x227.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_12-768x582.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Ovaj multimetar \u017eeljno \u010dega da ga se temeljito istestira i po potrebi izba\u017edari od strane nekog strpljivog elektroni\u010dara koji mu je spreman posvetiti koji slobodni dan za dru\u017eenje. Karakteristike su mu obe\u0107avaju\u0107e pa je mogu\u0107e da i trajno postane dio mjernog kompleta elektroni\u010dke radionice. Eto, jo\u0161 jedan potencijalni dokaz da nije sve staro odmah i za baciti \ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Danas je nabavljen digitalni multimetar Schlumberger 7040 iz 1976. godine. Schlumberger je dio me\u0111unarodne grupe sa tvrtkama u vi\u0161e zemalja, te isti ovaj proizvod mo\u017ee na prednjoj plo\u010di imati ispisana imena i nekih drugih tvrtki. Prema natpisima na prednjoj plo\u010di ovaj na\u0161 primjerak je mogu\u0107e proizveden u Francuskoj (fran. ARRET &#8211; isklju\u010deno) gdje\u00a0Schlumberger tako\u0111er ima [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2981,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":{"0":"post-2980","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-mjerni","8":"czr-hentry"},"jetpack_featured_media_url":"https:\/\/crowave.com\/blog\/wp-content\/uploads\/2018\/02\/dmm_schlumberger_7040_02.jpg","_links":{"self":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/2980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/comments?post=2980"}],"version-history":[{"count":5,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/2980\/revisions"}],"predecessor-version":[{"id":4770,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/2980\/revisions\/4770"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/media\/2981"}],"wp:attachment":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/media?parent=2980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/categories?post=2980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/tags?post=2980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}