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Database: 365,228(8 Aug 2026)

Shunt used for testing

Shunt used for testing, Total:184 items.

The international standard classification for "Shunt used for testing" includes: Powder metallurgy , Paints and varnishes , Power transmission and distribution lines .

The Chinese standard classification for "Shunt used for testing" includes: Technical Management , Metal physical property test method , Basic standard and general method for coating , .


Professional Standard - Electron

  • SJ 444-1973 Methods of measurement for anode current and anode current on underheated condition of high-voltage rectifier tubes
  • SJ 443-1973 Method of measurement for cathode heating time of high-voltage rectifier tubes
  • SJ/Z 9010.8-1987 Measurements of electrical properties of electronic tubes and valves--Part 8: Measurement of cathode heating time and heater warm-up time

国家市场监督管理总局、中国国家标准化管理委员会

  • GB/T 40380.2-2021 Metallic powders—Determination of apparent density and flow rate at elevated temperatures—Part 2: Determination of flow rate at elevated temperatures
  • GB/T 40380.1-2021 Metallic powders—Determination of apparent density and flow rate at elevated temperatures—Part 1: Determination of apparent density at elevated temperatures

未注明发布机构

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

  • GB/T 6753.4-1998 Paints and varnishes-Determination of flow time by use of flow cups

国家能源局

  • SY/T 6797-2020 Real-time measuring and adjusting tool for water injection well’s layered flowrate

Professional Standard - Petroleum

  • SY 6977-2014 Calibration method of real-time measuring and adjusting instrument for stratified flow in water injection well
  • SY/T 6797-2010 Real-Time Measuring and Adjusting Instrument of Flooding Well's Layered Flux
  • SY/T 6977-2014 The calibration method of real-time measuring and adjusting instrument of flooding wells layered flux

Professional Standard - Light Industry

  • QB/T 3815-1999 Thickness testing method of the metal deposits for the light industrial products Timekeeping of liquid flow method

Group Standards of the People's Republic of China

  • T/JSGT 003-2020 Exhaust gas velocity and flow monitoring Ultrasonic time difference method

Professional Standard - Traffic

中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会

  • GB/T 35138-2017 Measurement of fluid flow in closed conduits-Ultrasonic transit-time meters for liquid
  • GB/T 15544.4-2017 Short-circuit current calculation in three-phase a.c. systems―Part 4:Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth

SCC

  • BS 3900-A6:1986 Methods of test for paints-Determination of flow time by use of flow cups
  • BS 37-8:1959 Specification. Electricity meters-Alternating current precision kilowatt-hour meters for testing purposes
  • UNE 83364:2007 Self-compacting concrete. Determination of the flow time. V-funnel test.
  • BS 3900-A6:1971 Methods of test for paints. Tests on liquid paints (excluding chemical tests). Determination of flow time by use of flow cups
  • DANSK DS/ISO 2431:2019 Paints and varnishes – Determination of flow time by use of flow cups
  • ASME MFC-5M-1985(R2006) Measurement of Liquid Flow in Closed Conduits Using Transit-Time Ultrasonic Flowmeters
  • AASHTO TP 99-2013(2015) Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)
  • AASHTO T 390-2022 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)
  • AASHTO TP 99-2012 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)
  • DANSK DS/EN ISO 2431:2019 Paints and varnishes – Determination of flow time by use of flow cups (ISO 2431:2019)
  • NS-EN ISO 2431:2011 Paints and varnishes — Determination of flow time by use of flow cups (ISO 2431:2011)
  • BS 37-10:1961 Specification. Electricity meters-Alternating current high precision kilowatt-hour meters for efficiency testing of electrical plant
  • CEI EN 60068-2-30:2006 Environmental testing - Part 2: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle)
  • 10/30206993 DC BS EN ISO 2431. Paints and varnishes. Determination of flow time by use of flow cups
  • NS-EN 12846:2002 Bitumen and bituminous binders — Determination of efflux time of bitumen emulsions by the efflux viscometer
  • UNE 21239-3:1999 SHORT-CIRCUIT CURRENT CALCULATION IN THREE-PHASE A.C. SYSTEM. PART 3: CURRENT DURING TWO SEPARATE SIMULTANEOUS SINGLE PHASE LINE-TO-EARTH SHORT CIRCUITS AND PARTIAL SHORT-CIRCUIT CURRENTS FLOWING THROUGH EARTH.
  • DANSK DS/EN IEC 61083-3:2021 Instruments and software used for measurement in high-voltage and high-current tests – Part 3: Requirements for hardware for tests with alternating and direct voltages and currents
  • NS-EN 535:1991 Paint and varnishes — Determination of flow time by use of flow cups — (ISO 2431:1984 modified)
  • DIN EN 1267 E:2009 Draft Document - Industrial valves - Test of flow resistance using water as test fluid; German version prEN 1267:2009
  • DIN SPEC 91143-2:2012 Modern rheological test methods - Part 2: Thixotropy - Determination of the time-dependent structural change - Fundamentals and interlaboratory test; Text in German and English
  • AENOR UNE-EN 14187-2:2017 Cold applied sealing products. Test methods. Part 2: Determination of tack time.
  • DIN EN ISO 2431 E:2018 Draft Document - Paints and varnishes - Determination of flow time by use of flow cups (ISO/DIS 2431:2018); German and English version prEN ISO 2431:2018
  • NS-EN 12846-1:2011 Bitumen and bituminous binders — Determination of efflux time by the efflux viscometer — Part 1: Bituminous emulsions
  • DANSK DS/EN 12846-1:2011 Bitumen and bituminous binders – Determination of efflux time by the efflux viscometer – Part 1: Bituminous emulsions
  • NS-EN 12846-1:2022 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 1: Bituminous emulsions
  • UNE 20160:1981 MEASUREMENT OF THE WINDING RESISTANCE OF AN ALTERNATING CURRENT MACHINE DURING OPERATION AT ALTERNATING VOLTAGE
  • 11/30229950 DC BS EN 61083-4. Instruments and software used for measurements in high-voltage and high-current tests. Part 4. Requirements for software for tests with alternating and direct currents and voltages

GSO

  • OS GSO 509:1994 Methods of test for Paints and Varnishes - Determination of time of how by use of flow cups.
  • GSO 509:1994 Methods of test for Paints and Varnishes - Determination of time of how by use of flow cups.
  • GSO ISO 9073-13:2013 Textiles -- Test methods for nonwovens -- Part 13: Repeated liquid strike-through time
  • OS GSO ISO 12242:2015 Measurement of fluid flow in closed conduits -- Ultrasonic transit-time meters for liquid

IN-BIS

  • IS 3944-1982 How to measure flow time using a flow cup
  • IS 11426-1985 Specification for glass 0.5 AC precision kilowatt-hour electric meters for testing
  • IS 13107 T-1991 Measurement of winding resistance of AC motors when operating at AC voltage

European Committee for Standardization (CEN)

  • EN 535:1991 Paints and varnishes; determination of flow time by use of low cups (ISO 2431:1984 modified)
  • EN ISO 2431:2019 Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2019, Corrected version 2019-09)
  • EN ISO 2431:2011 Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2011)
  • prEN 12846-2-2021 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 2: Cut-back and fluxed bituminous binders
  • prEN 22431-1990 Paints and varnishes; determination of flow time by use of flow cups (ISO 2431, edition 1984 modified)
  • EN 1267:2012 Industrial valves - Test of flow resistance using water as test fluid
  • prEN 12846-1-2021 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 1: Bituminous emulsions

CZ-CSN

Indonesia Standards

  • SNI 03-6431-2000 Test methods for flow time of fiber-reinforced concrete through inverted slump cone

International Organization for Standardization (ISO)

  • ISO 12242:2012 Measurement of fluid flow in closed conduits - Ultrasonic transit-time meters for liquid
  • ISO 2431:1993 Paints and varnishes; determination of flow time by use of flow cups
  • ISO 2431:1984 Paints and varnishes — Determination of flow time by use of flow cups
  • ISO 2431:1980 Paint and varnishes — Determination of flow time by use of flow cups
  • ISO 6416:2017 Hydrometry - Measurement of discharge by the ultrasonic transit time (time of flight) method
  • ISO/TR 12765:1998 Measurement of fluid flow in closed conduits - Methods using transit-time ultrasonic flowmeters
  • ISO 2431:2011 Paints and varnishes - Determination of flow time by use of flow cups
  • ISO 2431:1972 Title missing - Legacy paper document
  • ISO 2431:1993/Cor 2:1999 Paints and varnishes - Determination of flow time by use of flow cups; Technical Corrigendum 2
  • ISO 2431:1993/Cor 1:1994 Paints and varnishes - Determination of flow time by use of flow cups; Technical Corrigendum 1
  • ISO 18843:2015 Aluminium oxide primarily used for the production of aluminium - Method for the determination of flow time
  • ISO/DIS 24062 Measurement of fluid flow in closed conduits — Clamp-on ultrasonic transit-time meters for liquids and gases
  • ISO/FDIS 24062:2023 Measurement of fluid flow in closed conduits — Clamp-on ultrasonic transit-time meters for liquids and gases
  • ISO 3425:1975 Sulphur for industrial use; Determination of ash at 850-900 degrees C and of residue at 200 degrees C

AT-ON

  • ONORM EN 535-1992 Paints and varnishes — Determination of flow time by use of flow cups

BE-NBN

  • NBN T 03-383-1981 Sulphur for industrial use - Determination of loss in mass at 80 °C
  • NBN-EN 535-1992 Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431, edition 1984 modified)

British Standards Institution (BSI)

  • BS EN ISO 2431:1996 Paints and varnishes - Determination of flow time by use of flow cups
  • BS EN ISO 2431:2011 Paints and varnishes. Determination of flow time by use of flow cups
  • BS EN ISO 2431:2019 Paints and varnishes. Determination of flow time by use of flow cups
  • BS ISO/TR 12765:1998 Measurement of fluid flow in closed conduits. Methods using transit-time ultrasonic flowmeters
  • BS EN ISO 4490:2002 Metallic powders - Determination of flow time by means of a calibrated funnel (Hall flowmeter)
  • BS 5857-1.5:1980 Methods for measurement of fluid flow in closed conduits, using tracers. Measurement of water flow. Transit time method using radioactive tracers
  • BS ISO 18843:2015 Aluminium oxide primarily used for the production of aluminium. Method for the determination of flow time
  • BS EN 60909-3:2010 Short-circuit currents in three-phase a.c systems - Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth
  • BS EN 60909-3:2004 Short-circuit current calculation in three-phase a.c. systems - Currents during two separate simultaneous single phase line-to- earth short circuits and partial short-circuit currents flowing through earth
  • BS 5857-2.4:1980 Methods for measurement of fluid flow in closed conduits, using tracers. Measurement of gas flow. Transit time method using radioactive tracers
  • BS ISO/TR 12765:1999 Measurement of fluid flow in closed conduits. Methods using transit-time ultrasonic flowmeters
  • BS ISO 24062:2023 Measurement of fluid flow in closed conduits. Clamp-on ultrasonic transit-time meters for liquids and gases

Association Francaise de Normalisation

  • NF P18-469:2023 Essai pour béton frais - Temps d'écoulement au cône
  • NF T30-070:1996 Paints and varnishes. Determination of flow time by use of flow cups.
  • NF T30-070:2011 Paints and varnishes - Determination of flow time by use of flow cups.
  • NF T30-070*NF EN ISO 2431:2019 Paints and varnishes - Determination of flow time by use of flow cups
  • NF EN 960:2006 False heads for use when testing protective helmets
  • NF X10-334*NF EN ISO 6416:2017 Hydrometry - Measurement of discharge by the ultrasonic transit time (time of flight) method
  • NF EN ISO 13517:2020 Metal powders - Determination of flow time using a calibrated funnel (Gustavsson flow cone)
  • NF EN 60068-2-30:2006 Environmental tests - Part 2-30: tests - Db test: cyclic damp heat test (12 h + 12 h cycle)
  • NF C41-083-3:2021 Instruments and software used for measurement in high-voltage and high current tests - Part 3 : requirements for hardware for tests with alternating and direct voltages and currents
  • NF ISO 14934-4:2015 Fire testing - Calibration and use of heat flow measuring devices - Part 4: guidelines for the use of heat flow meters in fire testing
  • NF T70-359:1996 Energetic materials for defense. Physico-chemical analysis and properties. Measurement of the duration of the outflow on the tnt or tnt compositions with the efflux viscosimeter

KR-KS

  • KS M ISO 2431-2022 Paints and varnishes — Determination of flow time by use of flow cups
  • KS M ISO 1388-12-2017 Ethanol for industrial use — Methods of test — Part 12: Determination of permanganate time
  • KS B ISO 6416-2021 Hydrometry — Measurement of discharge by the ultrasonic transit time (time of flight) method

Danish Standards Foundation

  • DS/ISO 2431:1982 Paints and varnishes. Determination of flow time by use of flow cups
  • DS/EN ISO 2431:2012 Paints and varnishes - Determination of flow time by use of flow cups
  • DS/EN 12846-2:2011 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 2: Cut-back and fluxed bituminous binders
  • DS/EN 60068-2-30:2006 Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle)
  • DS/EN 12846-1:2011 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 1: Bituminous emulsions

German Institute for Standardization

  • DIN EN ISO 2431:2012 Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2011); German version EN ISO 2431:2011
  • DIN EN ISO 2431:2020-02 Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2019, Corrected version 2019-09); German version EN ISO 2431:2019
  • DIN EN 60068-2-30:2006-06 Environmental testing - Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle) (IEC 60068-2-30:2005); German version EN 60068-2-30:2005 / Note: DIN EN 60068-2-30 (2000-02) remains valid alongside this standard until 2008-11-01.
  • DIN EN 12846-2:2023 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 2: Cut-back and fluxed bituminous binders
  • DIN EN 13409:2002-06 Method of test for hydraulic setting floor smoothing and/or levelling compounds - Determination of setting time; German version EN 13409:2002
  • DIN EN 12846-1:2023 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 1: Bituminous emulsions
  • DIN EN 12846-1:2023-02 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 1: Bituminous emulsions; German version EN 12846-1:2022
  • DIN 51810-2:2017-04 Testing of lubricants - Testing rheological properties of lubricating greases - Part 2: Determination of flow point using an oscillatory rheometer with a parallel-plate measuring system
  • DIN EN 60909-3:2010 Short-circuit currents in three-phase a.c. systems - Part 3: Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth (IEC 60909-3:2009); German version EN 60909-3:2010

Korean Agency for Technology and Standards (KATS)

  • KS M ISO 2431:2012 Paints and varnishes-Determination of flow time by use of flow cups
  • KS M ISO 2431-2012(2017) Paints and varnishes-Determination of flow time by use of flow cups
  • KS M ISO 2431:2022 Paints and varnishes — Determination of flow time by use of flow cups
  • KS D 0035-2006 Metallic powders-Determination of flow time by means of a calibrated funnel(hall flowmeter)
  • KS B ISO 6416:2021 Hydrometry — Measurement of discharge by the ultrasonic transit time (time of flight) method
  • KS D 0035-1985 Metallic powders-Determination of flow time by means of a calibrated funnel(hall flowmeter)
  • KS B ISO TR 12765:2005 Measurement of fluid flow in closed conduits-Methods using transit-time ultrasonic flowmeters
  • KS B ISO TR 12765-2020 Measurement of fluid flow in closed conduits-Methods using transit-time ultrasonic flowmeters
  • KS B ISO TR 12765-2005(2020) Measurement of fluid flow in closed conduits-Methods using transit-time ultrasonic flowmeters
  • KS M ISO 3425:2002 Sulphur for industrial use-Determination of ash at 850∼900°C and of residue at 200°C
  • KS M ISO 3425:2017 Sulphur for industrial use — Determination of ash at 850-900

CEN - European Committee for Standardization

  • EN ISO 2431:1996 Paints and Varnishes - Determination of Flow Time by Use of Flow Cups

VN-TCVN

  • TCVN 2092-2008 Paints and varnishes.Determination of flow time by use of flow cups

SE-SIS

Standard Association of Australia (SAA)

ES-UNE

  • UNE-EN ISO 2431:2020 Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2019, Corrected version 2019-09)
  • UNE-EN IEC 61083-3:2021 Instruments and software used for measurement in high-voltage and high-current tests - Part 3: Requirements for hardware for tests with alternating and direct voltages and currents (Endorsed by Asociación Española de Normalización in May of 2021.)

RO-ASRO

International Telecommunication Union (ITU)

American Society of Mechanical Engineers (ASME)

  • ASME MFC-5.1-2011(R2018) Measurement of Liquid Flow in Closed Conduits Using Transit-Time Ultrasonic Flowmeters
  • ASME MFC-5.1-2011 Measurement of Liquid Flow in Closed Conduits Using Transit-Time Ultrasonic Flowmeters

HU-MSZT

Lithuanian Standards Office

  • LST EN ISO 2431:2012 Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2011)
  • LST EN 12846-2-2011 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 2: Cut-back and fluxed bituminous binders
  • LST EN 60068-2-30-2006 Environmental testing -- Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle)
  • LST EN IEC 61083-3:2021 Instruments and software used for measurement in high-voltage and high-current tests - Part 3: Requirements for hardware for tests with alternating and direct voltages and currents (IEC 61083-3:2020)
  • LST EN 12846-1-2011 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 1: Bituminous emulsions

AENOR

  • UNE-EN ISO 2431:2012 Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2011)
  • UNE-EN 12846-2:2011 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 2: Cut-back and fluxed bituminous binders
  • UNE-EN 12846-1:2011 Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer - Part 1: Bituminous emulsions

(U.S.) Joint Electron Device Engineering Council Soild State Technology Association

  • JEDEC JEP152-2007 DDR2 DIMM Clock Skew Measurement Procedure Using A Clock Reference Board

The American Road & Transportation Builders Association

  • AASHTO TP 99-2011 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)
  • AASHTO TP 99-2013 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)
  • AASHTO T 390-2020 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)

AASHTO - American Association of State Highway and Transportation Officials

  • TP 99-2013 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)
  • TP 99-2011 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)
  • TP 99-2018 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)
  • TP 99-2012 Standard Method of Test for Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)

American Society for Testing and Materials (ASTM)

  • ASTM D2396-94(2004) Standard Test Methods for Powder-Mix Time of Poly(Vinyl Chloride) (PVC) Resins Using a Torque Rheometer
  • ASTM D2396-94(2012) Standard Test Methods for Powder-Mix Time of Poly(Vinyl Chloride) (PVC) Resins Using a Torque Rheometer
  • ASTM D2396-94(1999)e1 Standard Test Methods for Powder-Mix Time of Poly(Vinyl Chloride) (PVC) Resins Using a Torque Rheometer
  • ASTM D2396-20 Standard Test Methods for Powder-Mix Time of Poly(Vinyl Chloride) (PVC) Resins Using a Torque Rheometer

UY-UNIT

SG-SPRING SG

  • SS 78 Pt.B2-1992 Testing Concrete Part B2 : Recommendations For Surface Hardness Testing By Rebound Hammer

European Committee for Electrotechnical Standardization(CENELEC)

  • EN IEC 61083-3:2021 Instruments and software used for measurement in high-voltage and high-current tests - Part 3: Requirements for hardware for tests with alternating and direct voltages and currents

VDE - VDE Verlag GmbH@ Berlin@ Germany

  • VDE 0102-3 BERICHTIGUNG 1-2014 Short-circuit currents in three-phase a.c. systems - Part 3: Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth (IEC 60909-3:2009); German version EN 60909-3:2010@ Corrigendum to
  • VDE 0102-3-2010 Short-circuit currents in three-phase a.c. systems - Part 3: Currents during two separate simultaneous line-to-earth short-circuits and partial short-circuit currents flowing through earth (IEC 60909-3:2009); German version EN 60909-3:2010

American National Standards Institute (ANSI)

  • ANSI/ASME MFC-5M-1985 Measurement of Liquid Flow in Closed Conduits using Transit-Time Ultrasonic Flowmeters

International Electrotechnical Commission (IEC)

  • IEC TR 60279:1969 Measurement of the winding resistance of an a.c. machine during operation at alternating voltage

Canadian Standards Association (CSA)

  • CSA IEC 61000-4-34-06-CAN/CSA:2006 Electromagnetic compatibility (EMC) ?Part 4-34 :Testing and measurement techniques ?Voltage dips, short interruptions and voltage variations immunity tests for equipment with input current more than 16 A per phase

DIN

  • DIN EN 60909-3:2004 Short-circuit currents in three-phase a.c. systems - Part 3: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth (IEC 60909-3:2003); German version EN 60909-3:2003

RU-GOST R

  • GOST 26798.1-1996 Oil-well cement. Test methods
  • GOST 26798.1-1985 Oil-well cements. Test methods of flowability, density, water-el: mination, thickening time and setting time
  • GOST 30355.2-1996 Sulphur for industrial use. Determination of ash at 850-900 °C and of residue at 200 °C

PL-PKN

  • PN-EN IEC 61083-3-2021-08 E Instruments and software used for measurement in high-voltage and high-current tests -- Part 3: Requirements for hardware for tests with alternating and direct voltages and currents (IEC 61083-3:2020)