{"id":16408,"date":"2025-04-02T15:11:00","date_gmt":"2025-04-02T13:11:00","guid":{"rendered":"https:\/\/www.delphin.de\/?p=16408"},"modified":"2026-01-16T12:36:52","modified_gmt":"2026-01-16T11:36:52","slug":"galvanic-isolation","status":"publish","type":"post","link":"https:\/\/www.delphin.de\/en\/galvanische-trennung\/","title":{"rendered":"Galvanic isolation"},"content":{"rendered":"
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What is galvanic isolation?<\/strong><\/h2>\n\n\n\n

Galvanic isolation involves interrupting the electrical conduction between two circuits or decoupling two conductive objects from each other. The eponym of galvanic isolation is the Italian physician and biophysicist Luigi Galvani, who discovered galvanism by accident in 1780. If objects are galvanically separated, the electrical potentials are also separated from each other and the circuits are potential-free.<\/p>\n\n<\/div>\n\n

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Why is galvanic isolation necessary in measurement technology?<\/h2>\n\n\n\n

In measurement technology, galvanic isolation is necessary in order to avoid earth loops, potential shifts and electromagnetic interference<\/strong>that can distort measurement results. It ensures clean, interference-free signal transmission, protects users and measuring systems during tests on live components and ensures that precise and reliable data is recorded even in EMC-loaded environments or with long cables.<\/p>\n\n<\/div>\n\n

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Avoidance of earth current loops with galvanic isolation<\/h3>\n\n\n\n

In the case of measuring sections with ground reference, occurring earth potential differences can cause distortions, since the signal is not only transmitted via the analogue section, but also partly via the earth. These so-called earth current loops can lead to incorrect evaluation of the signal. Galvanic isolation in the input of the data acquisition unit prevents the occurrence of such earth current loops and thus ensures undistorted signal transmission.<\/p>\n\n<\/div>\n\n

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Avoidance of potential shifts with galvanic isolation<\/h3>\n\n\n\n

By linking several measuring circuits, reference potentials can be undesirably raised. The use of galvanically isolated measuring inputs solves this problem, as they eliminate the influence of the different reference voltages.<\/p>\n\n<\/div>\n\n

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Avoidance of electromagnetic interference with galvanic isolation<\/h3>\n\n\n\n

Especially in applications with long cable runs or in EMC-loaded environments, inductive or capacitive interference in the measuring circuit must be expected. In such cases, galvanic isolation in combination with suitable signal filtering ensures safe and undisturbed transmission of the useful signal.<\/p>\n\n<\/div>\n\n

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Galvanic isolation: High-precision measuring inputs<\/strong><\/strong><\/h3>\n\n\n\n

Product testing of electrical equipment requires thermal measurements on electrically live components. Thermocouples or Pt100 sensors may come into contact with mains supply. For this application, it is essential that the measurement device's inputs are galvanically isolated from each other as well as from the mains power supply. Delphin devices for this specific application guarantee isolation of up to 650 VAC between the separate channels, and 1000V AC to the mains power supply. The inputs are suitable to measure thermocouple or Pt100(0) sensors and current and voltage signals.<\/p>\n\n<\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n

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Galvanic isolation: Coupling elements in measurement technology<\/strong><\/strong><\/strong><\/h3>\n\n\n\n

To realise the electrical decoupling required for galvanic isolation, various coupling elements can be considered which transmit electrical signals between the non-conductively connected circuits by means of different physical principles.<\/p>\n\n\n\n

Capacitors use an electric field for signal transmission. Transformers generate a magnetic field that transmits the electrical signal into the electrically decoupled secondary circuit by induction. In data acquisition devices, on the other hand, optocouplers are usually used for signal transmission. The optocoupler converts an electrical signal into an optical signal. This signal reaches the receiver, which in turn converts it into an electrical signal. The two circuits are electrically decoupled and the transmission of unwanted artefacts is prevented.<\/p>\n\n\n\nClick here to go directly to a solution for galvanic isolation in the data acquisition device<\/strong><\/a>\n\n<\/div><\/div><\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

With galvanic isolation in your measured value acquisition systems, you benefit from precise data, higher system availability and reliable operation of your processes.<\/p>","protected":false},"author":6,"featured_media":16409,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[107],"tags":[88],"blog-kategorie":[125],"intern":[],"class_list":["post-16408","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analyse-ueberwachung","tag-galvanische-trennung","blog-kategorie-wissenswertes"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/posts\/16408","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/comments?post=16408"}],"version-history":[{"count":2,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/posts\/16408\/revisions"}],"predecessor-version":[{"id":17302,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/posts\/16408\/revisions\/17302"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/media\/16409"}],"wp:attachment":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/media?parent=16408"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/categories?post=16408"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/tags?post=16408"},{"taxonomy":"blog-kategorie","embeddable":true,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/blog-kategorie?post=16408"},{"taxonomy":"intern","embeddable":true,"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/intern?post=16408"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}