{"id":2637,"date":"2024-10-03T15:17:32","date_gmt":"2024-10-03T15:17:32","guid":{"rendered":"https:\/\/wiraelectrical.com\/id\/?p=2637"},"modified":"2025-01-29T05:30:47","modified_gmt":"2025-01-29T05:30:47","slug":"rumus-desibel","status":"publish","type":"post","link":"https:\/\/wiraelectrical.com\/id\/rumus-desibel\/","title":{"rendered":"Apa itu Rumus Desibel"},"content":{"rendered":"\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Rumus desibel membantu kita menghitung desibel berdasarkan perolehan daya. Kita juga dapat menggunakan rumus ini untuk mengkonversi skala desibel dan perolehan daya.<\/span><\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Skala Desibel<\/strong><\/h2>\n\n\n\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Desibel, diukur dalam dB adalah satuan yang kita gunakan untuk mengukur rasio antara dua kuantitas. Untuk saat ini, kita menggunakannya untuk mengukur rasio antara jumlah daya listrik.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Satu desibel setara dengan 10 kali logaritma rasio daya. Karena desibel umumnya digunakan dalam pengukuran suara atau kenyaringan, kita dapat mengatakan bahwa kenyaringan atau intensitas suara adalah 10 log 10 (P<sub>1<\/sub>\/P<sub>2<\/sub>) yang diukur dalam desibel.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">P<sub>1<\/sub> dan P<sub>2<\/sub> adalah intensitas dua suara. Ini akan meningkatkan intensitas sekitar 3 dB saat kita menggandakan intensitas suara.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Skala desibel akan menjadi hal mendasar sebelum kita mempelajari &#8216;Plot Bode&#8217;. Tidak selalu mudah untuk mendapatkan plot cepat dari besaran dan fase fungsi transfer seperti yang kita lakukan di atas.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Cara yang lebih sistematis untuk mendapatkan respons frekuensi adalah dengan menggunakan plot Bode.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Sebelum kita mulai membuat plot Bode, kita harus memperhatikan dua masalah penting: penggunaan logaritma dan desibel dalam mengekspresikan perolehan.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Rumus Desibel<\/strong><\/h2>\n\n\n\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Karena plot Bode didasarkan pada logaritma, penting bagi kita untuk mengingat sifat-sifat logaritma berikut ini:<\/span><\/p>\n<ol style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">log P<sub>1<\/sub>P<sub>2<\/sub> = log P<sub>1<\/sub> + log P<sub>2<\/sub><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">log P<sub>1<\/sub>\/P<sub>2<\/sub> = log P<sub>1<\/sub> \u2212 log P<sub>2<\/sub><\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">log P<sup>n<\/sup> = n log P<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">log 1 = 0<\/span><\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Dalam sistem komunikasi, penguatan diukur dalam satuan bel. Secara historis, bel digunakan untuk mengukur rasio dua tingkat daya atau penguatan daya G; yaitu,<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2641\" src=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/1.gif\" alt=\"\" width=\"239\" height=\"41\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Rumus db memberi kita satuan yang lebih kecil. Yaitu 1\/10 bel dan diberikan oleh<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2642\" src=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/2.gif\" alt=\"\" width=\"117\" height=\"41\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Ketika P<sub>1<\/sub> = P<sub>2<\/sub>, tidak ada perubahan daya dan penguatannya adalah 0 dB. Jika P<sub>2<\/sub> = 2P<sub>1<\/sub>, penguatannya adalah<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2643\" src=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/3.gif\" alt=\"\" width=\"182\" height=\"17\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">dan ketika P<sub>2<\/sub> = 0,5P<sub>1<\/sub>, keuntungannya adalah<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2644\" src=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/4.gif\" alt=\"\" width=\"210\" height=\"17\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Persamaan desibel di atas menunjukkan alasan lain mengapa logaritma banyak digunakan: Logaritma kebalikan dari suatu kuantitas adalah negatif dari logaritma kuantitas tersebut.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Atau, penguatan G dapat dinyatakan dalam bentuk rasio tegangan atau arus. Untuk melakukannya, perhatikan jaringan yang ditunjukkan di bawah ini.<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2640\" src=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/rumus-desibel-1.jpg\" alt=\"\" width=\"1373\" height=\"815\" srcset=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/rumus-desibel-1.jpg 1373w, https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/rumus-desibel-1-300x178.jpg 300w, https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/rumus-desibel-1-1024x608.jpg 1024w, https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/rumus-desibel-1-768x456.jpg 768w\" sizes=\"auto, (max-width: 1373px) 100vw, 1373px\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Jika P<sub>1<\/sub> adalah daya masukan, P<sub>2<\/sub> adalah daya keluaran (beban), R<sub>1<\/sub> adalah resistansi masukan, dan R<sub>2<\/sub> adalah <a href=\"https:\/\/wiraelectrical.com\/id\/rangkaian-seri-penjelasan-ciri-rumus-dan-rangkaian-pembagi-tegangan\/\" target=\"_blank\" rel=\"noopener\">resistansi<\/a> beban, maka P<sub>1<\/sub> = 0,5V<sub>1<\/sub><sup>2<\/sup>\/R<sub>1<\/sub> dan P<sub>2<\/sub> = 0,5V<sub>2<\/sub><sup>2<\/sup>\/R<sub>2<\/sub>, dan menjadi<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2645\" src=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/5.gif\" alt=\"\" width=\"278\" height=\"137\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Untuk kasus ketika R<sub>2<\/sub> = R<sub>1<\/sub>, suatu kondisi yang sering diasumsikan ketika membandingkan level tegangan, persamaan di atas menjadi<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2646\" src=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/6.gif\" alt=\"\" width=\"137\" height=\"41\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Sebaliknya, jika P<sub>1<\/sub> = I<sub>1<\/sub><sup>2<\/sup>R<sub>1<\/sub> dan P<sub>2<\/sub> = I<sub>2<\/sub><sup>2<\/sup>R<sub>2<\/sub>, untuk R<sub>1<\/sub> = R<sub>2<\/sub>, kita memperoleh<\/span><\/p>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2647\" src=\"https:\/\/wiraelectrical.com\/id\/wp-content\/uploads\/sites\/2\/2024\/10\/7.gif\" alt=\"\" width=\"135\" height=\"41\" \/><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Dua hal penting untuk diperhatikan dari persamaan di atas:<\/span><\/p>\n<ol style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Log 10 tersebut digunakan untuk daya, sedangkan log 20 digunakan untuk tegangan atau arus, karena hubungan kuadrat antara keduanya (P = V<sub>2<\/sub>\/R = I<sub>2<\/sub>R).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Nilai dB merupakan pengukuran logaritmik dari rasio satu variabel terhadap variabel lain yang sejenis. Oleh karena itu, berlaku dalam menyatakan fungsi transfer H dalam Persamaan Fungsi Transfer sebelumnya.<\/span><\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Dengan mengingat hal ini, kami sekarang menerapkan konsep logaritma dan desibel untuk membangun plot Bode.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":2639,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51],"tags":[],"class_list":["post-2637","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analisa-rangkaian-listrik","resize-featured-image"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"Rumus desibel membantu kita menghitung desibel berdasarkan perolehan daya. 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