{"id":1607,"date":"2026-01-14T11:22:30","date_gmt":"2026-01-14T10:22:30","guid":{"rendered":"https:\/\/www.skynext.tech\/?p=1607"},"modified":"2026-04-01T08:29:33","modified_gmt":"2026-04-01T07:29:33","slug":"pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis","status":"publish","type":"post","link":"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/","title":{"rendered":"PMU-001 : USB Phasor measurement unit with frequency logging, four quadrant power analysis and harmonics analysis"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"3472\" height=\"4624\" src=\"https:\/\/www.skynext.tech\/wp-content\/uploads\/2026\/01\/IMG_20260331_172546__01.jpg\" alt=\"\" class=\"wp-image-1668\"\/><\/figure>\n\n\n\n<p>This is a quick update on our flagship product development, PMU-001. Since October 2024, we put great effort in developing it. The PMU-001 USB device is intended for electricians that need a portable and reasonably affordable field device which provides the following features :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Robust GNSS based synchrophasor measurement, IEEE\u00a0Std\u00a0C37.118-2005 compliant with network bindings.<\/li>\n\n\n\n<li>6 channel analysis (3 voltage channels, 3 current channels, 2 auxiliary channels)<\/li>\n\n\n\n<li>4 quadrant power analysis<\/li>\n\n\n\n<li>Positive, negative and zero sequence vector decomposition<\/li>\n\n\n\n<li>logging and real-time (within standard delay requirement) equispaced sampling of frequency deviation from nominal mains<\/li>\n\n\n\n<li>Harmonics analysis and THD display and logging<\/li>\n\n\n\n<li>waveform logging<\/li>\n\n\n\n<li>USB 2.0 high speed device, hardware sampling rate 48 ksps.<\/li>\n\n\n\n<li>Lightweight NCURSES interface allowing use across low speed \/ character based tty<\/li>\n\n\n\n<li>Integrated class 0.1 voltage measurement transformers with secondary DAC TVS protection \/ clamping on top of internal DAC protection.<\/li>\n\n\n\n<li>1000V AC transformer winding voltage tolerance.<\/li>\n\n\n\n<li>Line to Line or Line to Neutral voltage measurements (120V up to 240V AC \/ 208V AC to 400V AC nominal voltage +15% tolerance)<\/li>\n<\/ul>\n\n\n\n<p>It leverages the power of a personal computer for high level analysis, reducing hardware costs, the software payload is C++ based and works on Linux distributions. Microsoft Windows porting is planned in the future.<\/p>\n\n\n\n<p>A fully functional hardware and software prototype is planned for Q3 2026.<\/p>\n\n\n\n<p>Most of the work is now dedicated on GPS disciplining and TCXO clocking, as well as cross channel analysis for four quadrant measurement, and delay vs filtering efficiency real time tuning. IEEE Std C37.118-2005 compliance will require rigorous conformity testing and calibration. At that time, a crowdfunding effort with pre-order priority will be put into effect, allowing trade electricians to have priority access to the device in the beta phase.<\/p>\n\n\n\n<p>Here are some video and screen capture teasers :<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video controls muted src=\"https:\/\/www.skynext.tech\/wp-content\/uploads\/2026\/01\/ncurses_output.mp4\"><\/video><figcaption class=\"wp-element-caption\">NCURSES display of frequency deviation, ROCOF, harmonic analysis, amplitude analysis, and synchrophasor data. Single phase to neutral display.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1055\" height=\"536\" src=\"https:\/\/www.skynext.tech\/wp-content\/uploads\/2026\/01\/freq_dev_13012026_v2.png\" alt=\"\" class=\"wp-image-1613\"\/><figcaption class=\"wp-element-caption\">top chart : raw frequency deviation measurements at 100 Hz sampling rate; bottom chart LP filtered at 10 Hz cutoff frequency and PCHIP interpolated\/equispaced frequency deviation measurements. <\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-video\"><video controls muted src=\"https:\/\/www.skynext.tech\/wp-content\/uploads\/2026\/01\/pmu_cnx_test_crop_no_audio.mp4\"><\/video><figcaption class=\"wp-element-caption\">Network PMU connection to PMU-001 using GPA PMU Connection Tester tool, displaying a single voltage channel synchrophasor and frequency measurements.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/www.skynext.tech\/wp-content\/uploads\/2026\/01\/websockets.mp4\"><\/video><figcaption class=\"wp-element-caption\">Websocket synchrophasor and frequency deviation interface (alpha version)<\/figcaption><\/figure>\n\n\n\n<p>We wish everyone a fruitful 2026 year. Stay tuned for updates !<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is a quick update on our flagship product development, PMU-001. Since October 2024, we put great effort in developing it. The PMU-001 USB device is intended for electricians that need a portable and reasonably affordable field device which provides the following features : It leverages the power of a personal computer for high level<\/p><\/div>\n<div class=\"blog-btn\"><a href=\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/\" class=\"home-blog-btn\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","pmpro_default_level":"","footnotes":""},"categories":[14,122],"tags":[],"class_list":["post-1607","post","type-post","status-publish","format-standard","hentry","category-electrotechnical-designs","category-metrology","pmpro-has-access"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>PMU-001 : USB Phasor measurement unit with frequency logging, four quadrant power analysis and harmonics analysis - SKYNEXT Tech.<\/title>\n<meta name=\"description\" content=\"PMU-001 project update. Affordable and lightweight USB phasor measurement unit with four quadrant metering, frequency and ROCOF measurements, symmetrical components analysis.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PMU-001 : USB Phasor measurement unit with frequency logging, four quadrant power analysis and harmonics analysis - SKYNEXT Tech.\" \/>\n<meta property=\"og:description\" content=\"PMU-001 project update. Affordable and lightweight USB phasor measurement unit with four quadrant metering, frequency and ROCOF measurements, symmetrical components analysis.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/\" \/>\n<meta property=\"og:site_name\" content=\"SKYNEXT Tech.\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-14T10:22:30+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-01T07:29:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.skynext.tech\/wp-content\/uploads\/2026\/01\/IMG_20260331_172546__01.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"696\" \/>\n\t<meta property=\"og:image:height\" content=\"927\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"R.Verissimo\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"R.Verissimo\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/\"},\"author\":{\"name\":\"R.Verissimo\",\"@id\":\"https:\/\/www.skynext.tech\/#\/schema\/person\/6b71040d3e4353a85583550901159cd8\"},\"headline\":\"PMU-001 : USB Phasor measurement unit with frequency logging, four quadrant power analysis and harmonics analysis\",\"datePublished\":\"2026-01-14T10:22:30+00:00\",\"dateModified\":\"2026-04-01T07:29:33+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/\"},\"wordCount\":381,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.skynext.tech\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.skynext.tech\/wp-content\/uploads\/2026\/01\/IMG_20260331_172546__01.jpg\",\"articleSection\":[\"Electrotechnical Designs\",\"Metrology\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/\",\"url\":\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/\",\"name\":\"PMU-001 : USB Phasor measurement unit with frequency logging, four quadrant power analysis and harmonics analysis - SKYNEXT Tech.\",\"isPartOf\":{\"@id\":\"https:\/\/www.skynext.tech\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.skynext.tech\/index.php\/2026\/01\/14\/pmu-001-usb-phasor-measurement-unit-with-frequency-logging-four-quadrant-power-analysis-and-harmonics-analysis\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.skynext.tech\/wp-content\/uploads\/2026\/01\/IMG_20260331_172546__01.jpg\",\"datePublished\":\"2026-01-14T10:22:30+00:00\",\"dateModified\":\"2026-04-01T07:29:33+00:00\",\"description\":\"PMU-001 project update. 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