{"id":765,"date":"2014-04-14T15:03:27","date_gmt":"2014-04-14T22:03:27","guid":{"rendered":"https:\/\/www.circuitspecialists.com\/blog\/?p=765"},"modified":"2014-06-20T11:25:08","modified_gmt":"2014-06-20T18:25:08","slug":"measuring-ac-voltage-with-panel-meter","status":"publish","type":"post","link":"https:\/\/www.circuitspecialists.com\/blog\/measuring-ac-voltage-with-panel-meter\/","title":{"rendered":"Use a Digital Panel Meter (DPM) to Measure AC Voltage"},"content":{"rendered":"<p>Digital Panel Meters (DPMs) are strictly DC meters due to the digital circuitry\u00a0used. Oftentimes it is desired to utilize a DPM to measure AC voltages to take\u00a0advantage of the improved accuracy and readability of a DPM. This application\u00a0note will describe the method to accurately display AC voltage values on a DPM.<\/p>\n<p>The CX102A Digital Panel Meter from Circuit Specialists is ideal for this\u00a0application, as it is designed to use in a system that has the measured signal\u00a0isolated from the power supply voltage. The application is for a 0-120 volt AC\u00a0meter powered by an external 9 volt battery. This application could also be\u00a0powered by a \u201cwall-wart\u201d type of AC adapter if desired.<\/p>\n<p>Like all\u00a0<a title=\"Digital Panel Meters\" href=\"\/digital-panel-meters\" target=\"_blank\">Digital Panel Meters<\/a>, the full scale range of this DPM is 200 mv full-scale.\u00a0To use the DPM to measure AC voltages, the AC voltage must be converted to\u00a0DC by a rectifier diode. The output from the rectifier diode will be a \u201cpulsed\u201d DC\u00a0voltage and may produce undesired fluctuations in the reading on the DPM, so\u00a0we will add a small filter capacitor across the rectified output voltage. The voltage\u00a0rating of this capacitor and the rectifier diode must be high enough to handle the\u00a0voltage levels present in the circuit. To be safe, we will use a rectifier diode and\u00a0capacitor rated at 250 volts or higher. Since we are using a single rectifier diode to\u00a0convert the AC into DC, we will have to choose our divider resistors appropriately\u00a0to compensate for the effects of the half wave rectifier operation. Since the AC\u00a0power line voltage is rectified by the series diode, the voltage applied to our DPM\u00a0is the peak value of the 120 volt line voltage which is 120 V multiplied by 1.414 .<\/p>\n<p>Vout = Vin X (1.414) = 120 X (1.414) = 169 V (DC)<\/p>\n<p>This is the actual DC voltage applied to our voltage divider resistors, so we will use\u00a0the voltage divider formula to determine the required resistors to produce the\u00a0correct reading on the DPM.<\/p>\n<p>To keep the calculated values within a range that is readily obtainable, we will use\u00a010 Meg ohms as the maximum series resistor value. We can then calculate the\u00a0shunt resistor for our voltage divider network using the voltage divider equation<\/p>\n<p>Vout\/Vin=Rshunt\/(Rseries + Shunt) rearranging we can solve for the required<\/p>\n<p>Use Rseries = 10 Meg Ohms<\/p>\n<p>For 0-120 Volts, Rshunt = 7.2 K ohms (use 7.5 K ohm)<\/p>\n<p>We will also need to connect pin 3 to pin 4 (for proper decimal point display).<\/p>\n<p>Note that the voltage value displayed on the meter can be fine-tuned by adjusting\u00a0the trimmer potentiometer on the back of the DPM.<\/p>\n<p>This application note has shown how a Digital\u00a0<a title=\"Panel Meter\" href=\"\/digital-panel-meters\" target=\"_blank\">Panel Meter<\/a>\u00a0may be used to\u00a0measure and display AC voltage values. The connection diagram is shown below.<\/p>\n<p>Note that pins 8 &amp; 10 are shorted together and connected to the Neutral\u00a0connection of the AC voltage that is being measured. Rshunt will be connected across pins 7 &amp; 8 and Rseries will have one end connected to pin 7 and the other\u00a0end to the voltage that is being measured.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.circuitspecialists.com\/content\/cx102a-blogimg.JPG\" alt=\"\" border=\"0\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Digital Panel Meters (DPMs) are strictly DC meters due to the digital circuitry\u00a0used. Oftentimes it is desired to utilize a<\/p>\n","protected":false},"author":42,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","footnotes":""},"categories":[1,20],"tags":[43,49,44,47,48,45,46],"class_list":["post-765","post","type-post","status-publish","format-standard","hentry","category-all-posts","category-panel-meters","tag-digital-panel-meters","tag-digital-temperature-displays","tag-dpm","tag-ldc-panel-meter","tag-led-panel-meter","tag-measuring-ac-voltage","tag-panel-meters-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Use a Digital Panel Meter (DPM) to Measure AC Voltage | Simply Smarter Circuitry Blog<\/title>\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.circuitspecialists.com\/blog\/measuring-ac-voltage-with-panel-meter\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Use a Digital Panel Meter (DPM) to Measure AC Voltage | Simply Smarter Circuitry Blog\" \/>\n<meta property=\"og:description\" content=\"Digital Panel Meters (DPMs) are strictly DC meters due to the digital circuitry\u00a0used. 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