{"id":2276,"date":"2017-05-16T00:00:54","date_gmt":"2017-05-15T15:00:54","guid":{"rendered":"https:\/\/micronix-jp.com\/?p=2276"},"modified":"2023-03-20T17:16:08","modified_gmt":"2023-03-20T08:16:08","slug":"level_jpn","status":"publish","type":"post","link":"https:\/\/micronix-jp.com\/english\/note\/application\/level_jpn.html","title":{"rendered":"Units of reference level for measurement"},"content":{"rendered":"<p class=\"bigTitle\" style=\"margin-bottom: 1em\">Summary of measurement units and calculation of noise level<\/p>\n\n\n<h2>Application<\/h2>\n<p>You may find plenty of measurement units in documents or references on wired or non-wired communication equipment.<\/p>\n<p>This application note gives you the explanation about units of noise measurement, and also supported units on MSA300\/400 series spectrum analyzers.<\/p>\n\n\n\n<h2>Solution<\/h2>\n<h3>Supported measurement units on MSA300\/400 series<\/h3>\n<p>You can read out the noise level in 6 measurement units, dBm, dB\u03bcV, dBmV, dBV, dB\u03bcV\/m and dB\u03bcA\/m on MSA300\/400 series spectrum analyzers.<br>\n(dB\u03bcV\/m only for electric field intensity and dB\u03bcA\/m only for magnetic field intensity)<\/p>\n<p>The unit, dBm, is the expression in decibel value normalized by 1mW power, and this means 1mW equals to 0dBm.<\/p>\n<p>The following formula can convert the value from dBm unit to mW unit .Reversely, the following formula gives you the way of conversion from dBm to mW.<\/p>\n<ul>\n<li><span style=\"font-weight:bold\">Power[dBm] = 10Log (Measurement-Power[W] \/ 1[mW] )<\/span><\/li>\n<li>Power[mW] = 10^ ( ( Measurement-Power[dBm] \/ 10 ) - 3 )<\/li>\n<\/ul>\n<p>The following table shows the conversion formula from dBm to each unit. (50\u03a9impedance).<\/p>\n\n<table>\n<tbody><tr>\n<th class=\"Center\">Unit<\/th>\n<th class=\"Center\">Conversion formula<\/th>\n<th class=\"Center\">Purpose<\/th>\n<th class=\"Center\">Comments<\/th>\n<\/tr>\n<tr>\n<td>dB\u03bcV<\/td>\n<td>[dB\u03bcV] = 107 + Measurement-Power[dBm]<\/td>\n<td>Power<\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td>dBmV<\/td>\n<td>[dBmV] = 47 + Measurement-Power[dBm]<\/td>\n<td>Power<\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td>dBV<\/td>\n<td>[dBV] = (-13) + Measurement-Power[dBm]<\/td>\n<td>Power<\/td>\n<td>&nbsp;<\/td>\n<\/tr>\n<tr>\n<td>dB\u03bcV\/m<\/td>\n<td>[dB\u03bcV\/m] = 68.8 \/ \u03bb \u00d7 \u221a( Measurement-Power[dBm] \/ Gar )<\/td>\n<td>Electric Field Intensity<\/td>\n<td>\u03bb\uff1aWave length[m]\u3001<br>\nGar\uff1aAbsolute gain of antenna<\/td>\n<\/tr>\n<tr>\n<td>dB\u03bcA\/m<\/td>\n<td>[dB\u03bcA\/m] = 107 +  Measurement-Power[dBm] + F<\/td>\n<td>Magnetic  Field Intensity<\/td>\n<td> F for Micronix CP-2SA magnetic field probe\n<ul style=\"text-align:left\">\n<li>10MHz : 86.7dB<\/li>\n<li>100MHz : 69.2dB<\/li>\n<li>1000MHz : 50.7dB<\/li>\n<li>2000MHz : 44.7dB<\/li>\n<li>3000MHz : 40.1dB<\/li>\n<\/ul><\/td>\n<\/tr>\n<\/tbody><\/table>\n\n\n<h3>Units for noise measurement<\/h3>\n<p>The value of noise power can be easily calculated through the conversion from measurement values on Micronix's spectrum analyzer.<\/p>\n<table>\n<tbody><tr>\n<th class=\"Center\">Unit<\/th>\n<th class=\"Center\">Conversion formula<\/th>\n<th class=\"Center\">Comments<\/th>\n<\/tr>\n<tr>\n<td>dBc\/Hz<\/td>\n<td>L(fm)[dBc\/Hz] = Pn(fm) - Pc - 10log(RBW x 1.2) + 2.5<\/td>\n<td>Pn(fm)\uff1aRBW Noise power at fm [dBm], fm: offset frequency[Hz]<br>\nPc \uff1a Carrier power [dBm]<\/td>\n<\/tr>\n<\/tbody><\/table>\n<ul class=\"flexBox flexBoxDivide\" style=\"margin-top:2em\">\n<li>The calibration is theoretically required for SSB phase  noise measurement on a spectrum analyzer.\n Here are the reasons for the calibration.\n<ol>\n<li>The difference of the RBW filter characteristic from ideal rectangle shape.<br>\nThe RBW should be expanded by 20% for conversion by RBW<\/li>\n<li>The compression of noise power at logarithm amplifier. 2.5 dB should be added to the SSB noise.<br>\nIn conclusion, the SSB phase noise per Hertz is calculated by the following formula.<\/li>\n<\/ol>\n<p>L(fm)[dBc\/Hz] = Pn(fm) - Pc - 10Log(RBW\u00d71.2) + 2.5<\/p>\n<\/li>\n<li><img loading=\"lazy\" decoding=\"async\" src=\"\/eng\/image\/application\/rebel-00.gif\" alt=\"Graph:Relation of setting values for noise measurement\" width=\"400\" height=\"305\"><br>\nRelation of setting values for noise measurement <\/li>\n<\/ul>\n\n\n\n<h2>Products introduction<\/h2>\n<p>MSA300 series was extremely upgraded to MSA400 series.This product has large color display. <\/p>\n  <div class=\"woocommerce columns-3 \"><ul class=\"products columns-3\">\n<li class=\"product type-product post-5787 status-publish first instock product_cat-shop-category-handheld-spectrum-analyzer product_cat-shop-category-msa400 product_tag-tag-handheld-spectrum-analyzer has-post-thumbnail shipping-taxable product-type-simple\">\n\t<a href=\"https:\/\/micronix-jp.com\/english\/products\/spectrum-analyzer\/msa400\/msa438.html\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2008\/05\/msa438_620x620-300x300.png\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\" srcset=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2008\/05\/msa438_620x620-300x300.png 300w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2008\/05\/msa438_620x620-150x150.png 150w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2008\/05\/msa438_620x620-600x600.png 600w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2008\/05\/msa438_620x620-100x100.png 100w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2008\/05\/msa438_620x620.png 620w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2 class=\"woocommerce-loop-product__title\">Handheld Spectrum Analyzer MSA438<\/h2>\n<\/a><\/li>\n<li class=\"product type-product post-5788 status-publish instock product_cat-shop-category-handheld-spectrum-analyzer product_cat-shop-category-msa400 product_tag-tag-handheld-spectrum-analyzer has-post-thumbnail shipping-taxable product-type-simple\">\n\t<a href=\"https:\/\/micronix-jp.com\/english\/products\/spectrum-analyzer\/msa400\/msa458.html\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa458_620x620-300x300.png\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\" srcset=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa458_620x620-300x300.png 300w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa458_620x620-150x150.png 150w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa458_620x620-600x600.png 600w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa458_620x620-100x100.png 100w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa458_620x620.png 620w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2 class=\"woocommerce-loop-product__title\">Handheld Spectrum Analyzer MSA458<\/h2>\n<\/a><\/li>\n<li class=\"product type-product post-5789 status-publish last instock product_cat-shop-category-handheld-spectrum-analyzer product_cat-shop-category-msa400 product_tag-tag-handheld-spectrum-analyzer has-post-thumbnail shipping-taxable product-type-simple\">\n\t<a href=\"https:\/\/micronix-jp.com\/english\/products\/spectrum-analyzer\/msa400\/msa438tg.html\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438tg_620x620-300x300.png\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\" srcset=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438tg_620x620-300x300.png 300w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438tg_620x620-150x150.png 150w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438tg_620x620-600x600.png 600w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438tg_620x620-100x100.png 100w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438tg_620x620.png 620w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2 class=\"woocommerce-loop-product__title\">[Discontinued Products] Handheld Spectrum Analyzer MSA438TG<\/h2>\n<\/a><\/li>\n<li class=\"product type-product post-5790 status-publish first instock product_cat-shop-category-handheld-spectrum-analyzer product_cat-shop-category-msa400 product_tag-tag-handheld-spectrum-analyzer has-post-thumbnail shipping-taxable product-type-simple\">\n\t<a href=\"https:\/\/micronix-jp.com\/english\/products\/spectrum-analyzer\/msa400\/msa438e.html\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438e_620x620-300x300.png\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\" srcset=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438e_620x620-300x300.png 300w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438e_620x620-150x150.png 150w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438e_620x620-600x600.png 600w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438e_620x620-100x100.png 100w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa438e_620x620.png 620w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2 class=\"woocommerce-loop-product__title\">Handheld Spectrum Analyzer MSA438E<\/h2>\n<\/a><\/li>\n<\/ul>\n<\/div>\n\n<h3>Handheld Spectrum Analyzer MSA300 Series<\/h3>  \n<p>The best-seller model. The smallest size and the lowest price in the world. <\/p>\n  <div class=\"woocommerce columns-3 \"><ul class=\"products columns-3\">\n<li class=\"product type-product post-5791 status-publish first instock product_cat-shop-category-discontinued-product product_cat-shop-category-handheld-spectrum-analyzer product_cat-shop-category-msa300 product_tag-tag-handheld-spectrum-analyzer has-post-thumbnail shipping-taxable product-type-simple\">\n\t<a href=\"https:\/\/micronix-jp.com\/english\/products\/spectrum-analyzer\/msa300\/msa338.html\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-300x300.png\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\" srcset=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-300x300.png 300w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-150x150.png 150w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-600x600.png 600w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-100x100.png 100w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620.png 620w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2 class=\"woocommerce-loop-product__title\">[Discontinued roduct]Handheld Spectrum Analyzer MSA338<\/h2>\n<\/a><\/li>\n<li class=\"product type-product post-5792 status-publish instock product_cat-shop-category-discontinued-product product_cat-shop-category-handheld-spectrum-analyzer product_cat-shop-category-msa300 product_tag-tag-handheld-spectrum-analyzer has-post-thumbnail shipping-taxable product-type-simple\">\n\t<a href=\"https:\/\/micronix-jp.com\/english\/products\/spectrum-analyzer\/msa300\/msa358.html\" class=\"woocommerce-LoopProduct-link woocommerce-loop-product__link\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-300x300.png\" class=\"attachment-woocommerce_thumbnail size-woocommerce_thumbnail\" alt=\"\" srcset=\"https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-300x300.png 300w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-150x150.png 150w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-600x600.png 600w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620-100x100.png 100w, https:\/\/micronix-jp.com\/english\/wp-content\/uploads\/sites\/2\/2023\/03\/msa300_620x620.png 620w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><h2 class=\"woocommerce-loop-product__title\">[Discontinued roduct]Handheld Spectrum Analyzer MSA358<\/h2>\n<\/a><\/li>\n<\/ul>\n<\/div><div class=\"wp-block-vk-blocks-button vk_button vk_button-color-custom vk_button-align-block\"><a href=\"\/eng\/file-download\/application\/pdf\/level_eng.pdf\" style=\"background-color:#5b6069;border:1px solid #5b6069;color:#fff;\" class=\"vk_button_link btn btn-md btn-block white\" role=\"button\" aria-pressed=\"true\" target=\"_blank\"  rel=\"noopener\"><i class=\"fas vk_button_link_before fa-file-pdf\"><\/i><span class=\"vk_button_link_txt\">Download This Application Note (PDF) <\/span><\/a><\/div><p><\/p><div class=\"wp-block-cover is-light vk_block-margin-xl--margin-top\"><span aria-hidden=\"true\" class=\"wp-block-cover__background has-white-background-color has-background-dim\"><\/span><img class=\"wp-block-cover__image-background wp-image-8105\" alt=\"\" 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This application note [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":8211,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"sns_share_botton_hide":"","vkExUnit_sns_title":"","_vk_print_noindex":"","sitemap_hide":"","_veu_custom_css":"<!--\u8a18\u4e8b\u306e\u30a2\u30a4\u30ad\u30e3\u30c3\u30c1\u3092\u6d88\u3059-->\n.veu_autoEyeCatchBox{\ndisplay:none;\n}","veu_display_promotion_alert":"","vkexunit_cta_each_option":"","_lightning_design_setting":{"layout":"default"},"header_top_description":"","footnotes":""},"categories":[17],"tags":[47,67,75],"class_list":["post-2276","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-category-note","tag-app-knowledge","tag-market-other","tag-application-spectrum-analyzer"],"veu_head_title_object":{"title":"","add_site_title":""},"_links":{"self":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/comments?post=2276"}],"version-history":[{"count":1,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2276\/revisions"}],"predecessor-version":[{"id":7016,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/posts\/2276\/revisions\/7016"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/media\/8211"}],"wp:attachment":[{"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/media?parent=2276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/categories?post=2276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/micronix-jp.com\/english\/wp-json\/wp\/v2\/tags?post=2276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}