{"id":3344,"date":"2021-10-01T08:49:36","date_gmt":"2021-10-01T08:49:36","guid":{"rendered":"https:\/\/www.nplindia.org\/?page_id=3344"},"modified":"2025-08-18T10:31:27","modified_gmt":"2025-08-18T10:31:27","slug":"lf-hf-voltage-current-and-microwave-metrology-section","status":"publish","type":"page","link":"https:\/\/www.nplindia.in\/index.php\/science-technology\/indian-standard-time-metrology-division\/lf-hf-voltage-current-and-microwave-metrology-section\/","title":{"rendered":"LF &#038; HF Voltage, Current &#038; Microwave Metrology"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"3344\" class=\"elementor elementor-3344\">\n\t\t\t\t\t\t<section class=\"has_eae_slider has_ma_el_bg_slider elementor-section elementor-top-section elementor-element elementor-element-89977eb elementor-section-full_width elementor-section-height-default elementor-section-height-default jltma-glass-effect-no\" data-eae-slider=\"92888\" data-id=\"89977eb\" 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elementor-element-6eee7c7 elementor-section-full_width elementor-section-height-default elementor-section-height-default jltma-glass-effect-no\" data-eae-slider=\"42526\" data-id=\"6eee7c7\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t\t\t\t\t<div class=\"elementor-background-overlay\"><\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"has_eae_slider has_ma_el_bg_slider elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-8b75a1a jltma-glass-effect-no\" data-eae-slider=\"4916\" data-id=\"8b75a1a\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3ac131a elementor-widget-tablet__width-auto elementor-widget-mobile__width-auto jltma-glass-effect-no elementor-widget elementor-widget-image\" data-id=\"3ac131a\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/CSIR-removebg-preview-150x150.png\" class=\"attachment-thumbnail size-thumbnail wp-image-24151\" alt=\"\" srcset=\"https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/CSIR-removebg-preview-150x150.png 150w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/CSIR-removebg-preview-300x300.png 300w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/CSIR-removebg-preview.png 500w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider has_ma_el_bg_slider elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-9e41c9f jltma-glass-effect-no\" data-eae-slider=\"86967\" data-id=\"9e41c9f\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-21388ae jltma-glass-effect-no elementor-widget elementor-widget-text-editor\" data-id=\"21388ae\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center; font-size: 43px; font-family: Arial Rounded MT Bold;\"><span style=\"color: #ffffff;\">\u0938\u0940\u090f\u0938\u0906\u0908\u0906\u0930-\u0930\u093e\u0937\u094d\u091f\u094d\u0930\u0940\u092f \u092d\u094c\u0924\u093f\u0915 \u092a\u094d\u0930\u092f\u094b\u0917\u0936\u093e\u0932\u093e<\/span><\/p><p style=\"text-align: center; font-size: 40px; font-family: Cooper Black;\"><span style=\"color: #ffffff;\"><span style=\"text-decoration: none;\">CSIR-National Physical Laborator<\/span>y<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"has_eae_slider has_ma_el_bg_slider elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-2044372 jltma-glass-effect-no\" data-eae-slider=\"29122\" data-id=\"2044372\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-eb96210 jltma-glass-effect-no elementor-widget elementor-widget-image\" data-id=\"eb96210\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.nplindia.in\/wp-content\/uploads\/2021\/12\/npl-1-150x150.png\" class=\"attachment-thumbnail size-thumbnail wp-image-39141\" alt=\"\" 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data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"has_eae_slider has_ma_el_bg_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0923374 jltma-glass-effect-no\" data-eae-slider=\"31903\" data-id=\"0923374\" data-element_type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9503a2d jltma-glass-effect-no elementor-widget elementor-widget-heading\" data-id=\"9503a2d\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-large\">LF &amp; HF Voltage, Current and Microwave Metrology<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"has_eae_slider has_ma_el_bg_slider elementor-section elementor-top-section elementor-element elementor-element-19e630b elementor-section-boxed elementor-section-height-default elementor-section-height-default jltma-glass-effect-no\" data-eae-slider=\"47519\" data-id=\"19e630b\" data-element_type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;gradient&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"has_eae_slider has_ma_el_bg_slider elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-cebc8b0 jltma-glass-effect-no\" data-eae-slider=\"63351\" data-id=\"cebc8b0\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-213875b jltma-glass-effect-no elementor-widget elementor-widget-accordion\" data-id=\"213875b\" data-element_type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-3481\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-3481\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">About<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3481\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-3481\"><p align=\"justify\">Precise and traceable measurements are important across all areas of life to ensure the performance and reliability of the measurement results. CSIR-NPL measures electrical quantities that are accurate, reliable and traceable to the SI units.\u00a0 The National standards are realized, established, maintained, upgraded and disseminated to support industry, govt. sector, research and academia. We maintain <strong>LF &amp; HF Voltage, Current, Microwave Power and Phasor Measurement Unit (PMU) <\/strong>parameters of electrical metrology. To maintain the international traceability, a number of international &amp; bilateral intercomparisons under the umbrella of BIPM and APMP have been carried out. At CSIR-NPL, PMU-CAL system traceable to its national standards carries out a comprehensive calibration of a PMU as per IEEE Standard IEC\/IEEE 60255-118-1:2018. It plays a vital role in power distribution sector through the PMU calibration and measurement system.<\/p><p align=\"justify\">CSIR-NPL provides <strong>apex level<\/strong><span><strong>\u00a0<\/strong><\/span><strong>calibration services<\/strong><span>\u00a0<\/span>in LF &amp; HF Voltage, LF Current, Microwave power and PMU parameters as per ISO\/IEC 17025:2017 standard to the industry, strategic sectors, STQC labs &amp; private organizations of the country by maintaining their respective primary standards. We are disseminating measurement traceability in the above-mentioned parameters along with the other derived parameters and their measurement capabilities. We have 24 registered CMC\u2019s and participated in more than 13 BIPM\/APMP key\/Supplementary comparisons to establish mutual degree of equivalence with the corresponding standards of the leading NMIs having internationally recognized traceability. <strong>\u00a0\u00a0<\/strong><\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-3482\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-3482\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Parameters<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3482\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-3482\"><p align=\"justify\"><strong>a. LF Voltage &amp; Current<\/strong><\/p><p>Banks of Multi-Junction thermal converters (MJTC) are used for assigning AC DC transfer difference to the primary standard (MJTC) at 2 Volt and 5mA with the best uncertainty of \u00b15ppm. Therefore, the thermal transfer standard or thermal converters are designed to cover voltage range of 1mV volts to 1000 volts in the frequency range 10 Hz to 1 MHz with an uncertainty of \u00b1 (7 to 1000) ppm and current range of 1mA to 20 A in the frequency range of 40 Hz to 10 kHz with an uncertainty of \u00b1 (10 to 92) ppm.<strong><br \/><\/strong><\/p><div id=\"attachment_24790\" style=\"width: 894px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-24790\" src=\"https:\/\/www.nplindia.org\/wp-content\/uploads\/2023\/01\/1-2.jpg\" alt=\"\" width=\"884\" height=\"286\" class=\"wp-image-24790 size-full\" srcset=\"https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/1-2.jpg 884w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/1-2-300x97.jpg 300w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/1-2-768x248.jpg 768w\" sizes=\"(max-width: 884px) 100vw, 884px\" \/><p id=\"caption-attachment-24790\" class=\"wp-caption-text\">Fig.: a) Measurement Setup for Primary Standard b) Measurement setup of DUC under Calibration<\/p><\/div><p align=\"justify\"><strong>b<\/strong>. <strong>HF Voltage<br \/><\/strong><br \/>High frequency (HF) voltage primary standard at NPLI has been realized using a twin resistance coaxial power mount in the frequency range of 1 MHz to 1000 MHz. The rf\/dc transfer difference has been assigned at the input reference plane of the primary standard. The overall uncertainty in assigning RF DC transfer difference has been estimated to be within \u00b10.50% in the frequency range up to 1 GHz. With the establishment of the RF voltage primary standard, one can calibrate and assign the RF DC transfer difference to the transfer standard thermal voltage converters. HF Voltage standard is used to calibrate the RF Voltage meters, high frequency thermal converters using the well-established technique.<\/p><div id=\"attachment_24797\" style=\"width: 760px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-24797\" src=\"https:\/\/www.nplindia.org\/wp-content\/uploads\/2023\/01\/2-3-1024x403.jpg\" alt=\"\" width=\"750\" height=\"295\" class=\"wp-image-24797 size-large\" srcset=\"https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/2-3-1024x403.jpg 1024w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/2-3-300x118.jpg 300w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/2-3-768x302.jpg 768w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/2-3-1536x605.jpg 1536w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/2-3-2048x806.jpg 2048w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><p id=\"caption-attachment-24797\" class=\"wp-caption-text\">Fig.: HF Voltage Setup<\/p><\/div><p align=\"justify\"><strong>c<\/strong>. <strong>Microwave Power<br \/><\/strong><br \/>Coaxial Microcalorimeter system in 2.4mm connector, established as the primary standard of Microwave Power in the frequency range of 1 MHz to 50 GHz is an absolute method based on thermocouple principle for the determination of effective efficiency to the thermocouple sensor. This section provides <strong>apex level<\/strong><span><strong>\u00a0<\/strong><\/span><strong>calibration services<\/strong><span>\u00a0<\/span>in microwave power parameter to the industry &amp; user organizations of the country. In order to meet the growing demand for calibration of microwave equipments in this era of continuously growing technology, CSIR-NPL disseminates the traceability of microwave power from 1MHz up to 50 GHz. The absolute value of the effective efficiency has been assigned to the microwave power standard from 1 MHz to 50 GHz using coaxial microcalorimeter and Vector network analyzer. The expanded uncertainty of microwave power primary standard at 50 GHz is \u00b11.9%.<\/p><div id=\"attachment_24805\" style=\"width: 896px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-24805\" src=\"https:\/\/www.nplindia.org\/wp-content\/uploads\/2023\/01\/3-2.jpg\" alt=\"\" width=\"886\" height=\"285\" class=\"wp-image-24805 size-full\" srcset=\"https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/3-2.jpg 886w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/3-2-300x97.jpg 300w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/3-2-768x247.jpg 768w\" sizes=\"(max-width: 886px) 100vw, 886px\" \/><p id=\"caption-attachment-24805\" class=\"wp-caption-text\">Fig.: a) 2.4mm Coaxial Microcalorimeter b) Coaxial Thermocouple sensor<\/p><\/div><p align=\"justify\"><strong>d.<\/strong> <strong>Phasor Measurement Unit Calibration System<br \/><\/strong><br \/><span>Today\u2019s smart grid relies on phasor measurement units (PMUs) to deliver real-time critical data on the voltage, current, frequency and phase mainly within the power grid. It is mandatory that PMUs must be calibrated from a traceable calibrator system to ensure its consistency, accuracy and reliability. The CSIR-NPL Phasor Measurement Unit Calibration System (PMU-CAL) is capable of providing perfect solutions for PMU users, manufacturers, electrical power utilities and organizations associated with electrical power transmission. The automated PMU-CAL system fully complies with the IEC\/IEEE 60255-118-1:2018 standard. The compliance testing of Phasor Measurement Unit (PMU) from 50V to 150V and 1A to 5A at 50 Hz with a frame rate of 10, 25 and 50 frame\/seconds has become possible with the establishment of PMU-CAL system serving the nation through power sector. The CSIR-NPL PMU calibration system has an uncertainty of \u00b10.005% to \u00b10.010%. We use PMU-CAL system to generate a wide variety of complex signals, including flicker, harmonics. This feature gives us flexibility to calibrate PMUs by different manufacturers.<\/span><\/p><div id=\"attachment_24815\" style=\"width: 553px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-24815\" src=\"https:\/\/www.nplindia.org\/wp-content\/uploads\/2023\/01\/4-1.jpg\" alt=\"\" width=\"543\" height=\"322\" class=\"wp-image-24815 size-full\" srcset=\"https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/4-1.jpg 543w, https:\/\/www.nplindia.in\/wp-content\/uploads\/2023\/01\/4-1-300x178.jpg 300w\" sizes=\"(max-width: 543px) 100vw, 543px\" \/><p id=\"caption-attachment-24815\" class=\"wp-caption-text\">Fig.: Phasor Measurement Unit Calibration System<\/p><\/div><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-3483\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-3483\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Calibration Services<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3483\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-3483\"><ol><li>Digital Multimeter for LF Voltage from 1 mV to 1000 V and LF Current 1 mA to 20 A.<\/li><li>Voltage &amp; Current Calibrator for LF Voltage from 1 mV to 1000 V and LF Current 1mA to 20 A.<\/li><li>AC Reference Source<\/li><li>Transconductance Amplifier (AC Current Source) up to 20 A<\/li><li>Micropotentiometer (Low Voltage TVC) from 1 mV to 200 mV<\/li><li>Thermal Voltage Converter 1 mV to 1000V<\/li><li>Thermal Transfer Standard 2 mV to 1000 V<\/li><li>Current Shunt 1mA to 20A<\/li><li>Amplifier with Load cell, Dynamic Strain Meter 0-5 V and upto 100 kN<\/li><li>AC Measurement Std 1mV to 1000V<\/li><li>AC Measurement Std\/+Current Shunt 1mA to 20A<\/li><li>Handheld CRO 10Hz to 1MHz<\/li><li>CRO\/DSO\/MSO 10Hz to 1MHz<\/li><li>Frequency Counter<\/li><li>Universal Counter<\/li><li>Selective Microvoltmeter, Level Meter Up to 1000 MHz<\/li><li>RF Millivoltmeter Up to 1000 MHz<\/li><li>Synthesizer Sweep Oscillator 1 MHz to 18 GHz<\/li><li>RF Power Meter with Sensor 1 MHz to 50 GHz<\/li><li>Coaxial Thermistor Mount, Power Mount 1 MHz to 18 GHz<\/li><li>RF Power Transfer Standard 1 MHz to 50 GHz<\/li><li>Phasor Measurement Unit Calibrator System<\/li><li>Phasor Measurement Unit- P Class\/ M Class Testing\/Calibration as per IEEE<\/li><\/ol><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-3484\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-3484\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Scientist and Technical Staff<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3484\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-3484\"><ol><li><a href=\"\/wp-content\/uploads\/2022\/08\/saood_ahmad@nplindia.pdf\" target=\"_blank\" rel=\"noopener\"><strong>Dr. Saood Ahmad<\/strong><\/a>, Chief Scientist<\/li><li><a href=\"\/wp-content\/uploads\/common\/avni_khatkar@nplindia.pdf\" target=\"_blank\" rel=\"noopener\"><strong>Dr. Avni Khatkar<\/strong><\/a>, Sr. Scientist<\/li><li><strong>Ms. Archana Sahu<\/strong>, Senior Technical Officer<\/li><li><strong>Ms. Sunidhi Luthra<\/strong>, Technical Officer<\/li><li><strong>Ms. Swati<\/strong>, Technical Officer<\/li><\/ol><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-3485\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-3485\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Contact<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-3485\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-3485\"><p><strong><a href=\"\/wp-content\/uploads\/2022\/08\/saood_ahmad@nplindia.pdf\" target=\"_blank\" rel=\"noopener\">Dr. Saood Ahmad<\/a><br \/><\/strong>Chief Scientist &amp; Head<br \/><span style=\"text-decoration: underline;\">Section<\/span>: \u00a0LF &amp; HF Voltage, Current and Microwave Metrology Section<br \/><span style=\"text-decoration: underline;\">Division<\/span>: Indian Standard Time<br \/><span style=\"text-decoration: underline;\">Email<\/span>: ahmads<span>.nplindia@csir.res.in<\/span><br \/><em><span 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