【经验】用U1242系列手持数字万用表检测谐波

时间： 2019-04-29 来源：Keysight

设备和机器的广泛使用，谐波失真在当今世界变得越来越普遍。由于这些设备在高谐波电压和（或）电流水平下可能发生故障或失灵，谐波失真已成为设备管理人员、自动化设备用户和工程师日益关注的问题。谐波的存在并不妨碍工厂或办公室的正常运作。然而，这取决于配电系统的承受能力和设备的敏感性。在该应用笔记中，你将会学习一些关于谐波的基本知识并且会了解如何对电力系统进行快速的谐波检测。

谐波是什么

谐波是电力系统中出现的电压和电流，其频率是基本供电频率的整数倍，谐波在欧洲国家被定义为50Hz，在北美国家被定义为60Hz。例如，如果基频为60hz，那么二阶谐波为120hz，三阶为180hz，四阶为240hz，以此类推

图1 含有三阶和五阶谐波的正弦波的合成波形

产生谐波的因素

谐波是由具有非线性负载的现代电子设备引起的。这些非线性负载会在突发短脉冲中形成电流从而产生谐波。短脉冲会导致电流波形失真，进而导致谐波电流回流到电力系统的其他部分。谐波在有大量个人电脑、激光打印机、传真机、复印机、医疗测试设备、荧光灯、不间断电源(UPS)和变速驱动器的地方尤其普遍。

谐波会降低电能质量和效率，特别是在商业建筑或工业设施中。一般情况下，大多数建筑物可以承受高达电力系统总容量15%的非线性负载，如果非线性负载超过15%，就会产生一些不明显的负面影响。

谐波引起的问题

下面是一些由谐波引发的常见问题，不同建筑物产生的和谐波有关的实际问题也会不尽相同，这取决于其安装的产生谐波装置的种类和数量。

中性导体过载

三相系统由三个独立的相导体和一个中性导体组成。如果所有的相导体都承载相同的电流，那么只要有一个平衡的负载，相电流就会互相抵消。这种平衡负载使减小中性导体的尺寸成为可能。不幸的是，计算机使用的开关电源具有很高的三次谐波电流。当谐波电流在中性导线上相互抵消时，三次谐波电流在中性导线上是会加成的。在装有大量个人电脑的建筑物中，中性导线所携带的电流比其设计容量要大得多，这就造成了潜在的火灾危险。

变压器过热，导致相关损失增加

对于输入谐波产生负载的变压器，绕组中的涡流损耗占据了变压器损耗的绝大部分。这种涡流损耗与产品谐波电流的平方及其对应频率成正比。满负载的变压器对非线性负载的总损耗是等效线性负载的两倍。这导致变压器过热，变压器内部绝缘材料老化，最终会导致变压器故障。

断路器不当跳电

所有包含电容和电感的电路都有一个或多个谐振频率。当任何谐振频率同非线性负载产生的谐波频率一致时，就会发生谐波共振。谐振频率下的电压和电流会发生高度失真。这种失真会在电力系统中造成不当跳电，最终导致生产损失。

用U1242系列手持数字万用表检测谐波

谐波分析仪是对电能质量进行详细分析以确定电压和电流在各自频谱上的波形的最有效的仪器。谐波分析仪在没有明显谐波现象的情况下也很有用，因为你无法确定谐波是否会造成问题。

为了帮助技术人员或电工快速识别源中是否存在谐波，KEYSIGHT引入了一个名为谐波比率的U1242 Series DMM的新特性。谐波分析仪用于对可疑源进行详细的谐波分析。利用这些数据，谐波比率函数计算一个从0%到100%的值来表示非正弦和正弦波形的偏差，该值表示谐波的存在与否。一个没有谐波的纯正弦波形的谐波比率为0%。高谐波比率的测量结果表明，信号中存在较多的谐波。通常情况下，5%的谐波比率不用太过担心，而任何超过10%谐波比率的都会给你带来麻烦。

图2说明了谐波比是如何推导出来的。

图2 谐波比率的计算

表1给出了基于真有效值DMM和平均响应型DMM谐波读数精确比较得出的谐波比率

表1 真RMS，平均响应以及谐波比率的差别

结论

Keysight U1242系列手持数字万用表内置谐波比率功能，帮助技术人员和工程师快速验证交流信号中是否存在谐波。这些信息可用于预防或减少设备宕机和维修成本。

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本文由奥莉翻译自Keysight，版权归世强硬创平台所有，非经授权，任何媒体、网站或个人不得转载，授权转载时须注明“来源：世强硬创平台”。

全部评论（5）

鄗立恒 Lv8. 研究员 2019-04-30

学习了。
FENT Lv8. 研究员 2019-04-29

这个技术不错
好运常伴吾 Lv8. 研究员 2019-04-29

学习
沉浮 Lv7. 资深专家 2019-04-29

不错
行行摄摄 Lv7. 资深专家 2019-04-29

学习一下

没有更多评论了

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Keysight（是德科技）测试仪器分销产品选型指南（英文）

目录- BenchVue Control and Analysis Software RF Bench and Handheld Instruments Handheld Spectrum Analyzers FieldFox Handheld Analyzers Spectrum Analyzers, Signal Analyzer Audio Analyzer and Signal Generator Power Sensors and Power Meters RF and Microwave Test Accessories Vector Network Analyzers and ECal Modules Essential Bench Oscilloscopes, Applications, and Probes Digital Multimeters Function/Arbitrary Waveform Generators Data Acquisition/Switch Units USB Products and Connectivity Frequency Counters/Timers Power Supplies Bench Power Supplies System Power Supplies Precision Power Supplies System Power Supplies(continued) DC Power Analyzer, SMUs, and DC Electronic Loads AC Power Sources LCR Meters Handheld Instruments

型号- U8480,B2911A,U1272A,N8926A,34460A,N7040A,U8000,N9340B,53140,N5742A,N5766A,34905A,N9918A,N6735B,N8480,N5743A,N5767A,N1914A,3024T,3012T,U1273A,34904A,N6746B,N6734B,U3800,U1282A,N8948A,34470A,N7042A,N1913A,N5744A,N5768A,34903A,N8924A,N9916A,N9928A,34939A,N6701C,N8949A,U1271A,N8925A,N8937A,N7041A,N1912A,N9000B,N5745A,N5769A,N2819A,3022T,3034T,N6700C,34902A,N9917A,34938A,N6736B,U1600,8491A,DSOX1102G,DSOX1102A,N9320B,P-SERIES,33509B,N7020A,N1911A,N9344C,N5746A,N3302A,N2818A,34901A,34937A,U1701B,82357B,U1273AX,U2802A,N5181B,N2142A,U1281A,B2902A,4024A,N5747A,N3303A,8490G,N2805A,3032T,N6702C,U1700,N6705C,N8928A,N9342C,33519B,B2901A,N3304A,N5748A,34947A,N2804A,N8929A,N5171B,N9343C,N2140A,X-SERIES,B2912A,N3305A,U8903B,N5749A,4022A,34934A,4034A,34946A,8480D,3054T,U2702A,N3306A,U1733C,U1210,U2300,N5700,34945A,3458A,TU1453A,U2701A,B2962A,1146B,N3307A,1147B,N7026A,33600A,33612A,B2961A,N9322C,N9310A,U1731C,2002A,53200,2014A,3104T,U1610A,U2723A,33611A,2004A,U1732C,J7205A,34942A,U3606B,53210A,J7205B,U2722A,N1810UL,33622A,3102T,34941A,N8760A,2012A,2024A,U2500,U1620A,33512B,33500B,33621A,N1810TL,3004A,N6700,N6705,N8761A,N2821A,33511B,N3300,4104A,2022A,N2820A,U2600,33510B,33522B,3014T,N2843A,E36100B,33521B,N9962A,87106D,AC6804B,E4982A,DAQM905A,34950A-34959A,N6750,N9950A,N8740A,E36103B,U2020,EDUX1002A,N9951A,33520B,N7007A,83050A,N2962A,53131A,P9243A,E4981A,U2741A,34972A,E36102B,J7211B,J7211A,J7211C,E36320A,N8741A,AC6802B,DAQM903A,U1270,N9960A,E36311A,N8762A,E36105B,N6781A,U2000,E3641A,EDUX1002G,N2863B,AC6803B,DAQM904A,N8900,U1280,84904L,U2751A,34970A,N9961A,B2900,E36104B,E3640A,AC6800B,N2862B,6002A,E3600,E-SERIES,E36313A,DAQM900A,U1250,U5850,N8756A,N8732A,N8950A,AC6801B,10070D,DAQM902A,U2761A,34980A,E36300A,E36312A,N6782A,DAQM901A,E36106B,53220A,N8757A,87222D,N8733A,N8951A,87222E,N9952A,87104D,P9242A,E4980A,6004A,53132A,N6785A,N6773A,U1452A,B2980A,N6761A,N8754A,N8742A,P9241A,N2871A,53230A,N8700,N4985A-S50,U1240,N6784A,E4981A-001,E4981A-002,N8755A,U1453A,N8731A,N2870A,8495D,N2797A,87405B,N2894A,N5770A,8495B,87405C,34420A,E3647A,10833F,34921A-25A,10833G,10833A,10833B,4154A,10833C,10833D,N6775A,U1450A,N8736A,N6763A,U1232A,N8954A,N6751A,N8930A,N7550,N9923A,N2796A,N9935A,N2893A,N5771A,E36100,E3646A,6811C,N4985A-S30,4032A,N8737A,N6786A,N6774A,N8943A,N6762A,E5063A,10834A,N8955A,U1451A,8494G,N8931A,E3634A,U1233A,3052T,N2783B,P9371A,N2795A,N5772A,6813C,E3649A,6800C,6812C,N6753A,N8758A,U1460A,N6741B,U1242C,N8734A,U1242B,N8952A,N6777A,N8940A,N6765A,P9370A,N2891A,N2782B,EPM SERIES,53181A,N5761A,34931A-33A,34465A,E3648A,4054A,N8759A,N6764A,U1231A,U1461A,N6752A,E9320,83020A,N8735A,N8941A,N6776A,N2793A,DAQ970A,N2890A,L2060,N2781B,U1240C,N9914A,82350C,N5750A,N5762A,U2063,E5810B,N8934A,N6743B,N9926A,P1912A,N8946A,N6731B,N9938A,U1252B,E3643A,E3631A,N6755A,14585A,N2792A,N2780B,U1241C,N5763A,E4980AL,N5751A,E36300,E9300,N8923A,N9915A,N8935A,N6742B,N9927A,E3630A,U1241B,4052A,U1253B,E3642A,N6766A,34908A,N6754A,N2791A,N9912A,N8738A,N9936A,U1190,U2040,N5752A,N5764A,34450A,DAQM907A,N8932A,N8944A,34907A,N8920A,E3645A,N6745B,E3633A,N6733B,L2050,N2790A,U1251B,N8739A,N9913A,N9925A,N5741A,DAQM908A,N5765A,34461A,U2053,N8945A,N6732B,N9937A,N8957A,N8921A,E3632A,E3620A,N6756A,E3644A,N6744B

November 2018 - KEYSIGHT - 选型指南

福禄克测试仪器工业产品目录

描述- 福禄克测试仪器目录展示了其丰富的产品线，包括绝缘电阻测试仪、红外热像仪、数字万用表、钳形表、过程校验仪、电能质量分析仪、接地系统测试仪等。目录还介绍了福禄克的发展历程，从1948年创立至今，福禄克不断推出创新产品，如世界上第一款真有效值数字电压表、第一台实用手持式数字万用表等。此外，目录还详细介绍了Fluke Connect™系列测试工具，包括其产品特性、技术参数和附件等。

型号- 917X,ST60+,9062,80K-6,233,TL80A,725EX,TP175,C50,3000 FC,TI200,362,8508A,365,1587,368,369,922,923,925,805,I3000S,87V/C,123B,I400S,1551A,A3004 FC,TP82,C781,TP81,TP80,930,1111,810,931,2640A,96270A27C,TP88,TL238,568 EX,TIS,1625-2,80K-40,C75,T6,TL910,1552A,117C1,381,TI300,419D,438-II,572-2,124B,I410,705,707,CXT,709,1587FC,18B+,TLK-220,ST80+,TLK-225,I6000S,154,1586A,830,568-2,125B,I200,9500B,I400E,715,C90,717,I30S,718,719,87V/C/IMS,59,5730A,6100B,TIX640,TLK289,I300S FLEX-24,700G,6003A,C5501,NORMA 5000,TI400,1550C,7250,I2000S,712C,721,TIX520,TL223,724,TL222,TL221,726,TL220,729,2271A,TL224,725S,AC 173,PV350,9190A,AC285,1595A,707EX,AC280,C345,5080A,AC283,C101,MT4 MAX+,971,TL40,I310S,975,17B+,115C,AC 175,VR1710,5502A,I1000S,50II,FPS 850,1560M,190II,TIX1000,88V/A,TI450SF6,C116,C115,714C,2811,TIX500,I300S FLEX-36,985,TIX620,116C,902 FC,TP920,I5S,353 2000,AC220,C800,ST201,NORMA 4000,802CN,1734,C12AS,1732,P3000,62 MAX,8808A,1738,1736,566-2,I800,V3000 FC,754EL,719PRO,1594A,2042,TIX560,3130,5790B,TP220,1621,TP1,370 FC,I200S,TP2,2700G,TP4,1508,302+,FOS 1300,175C,52120A,754PLUS,TIS60,TIS65,6105A,TLK281,771,P3100,TLK282,772,773,LVD1,1630,TL82,1750,TLK287,15B+,6270A,2638A,753EL,5320A,750P,TIX660,TIS75,1524,TL75,1523,TL71,303,787,1760,305,5725A,789,355 2000,1529,430-II,62 MAX+,177C,1660,80K-15,TIS40,P5510,TIS45,1535,552,MT4 MAX,P5513,P5514,312,P5515,TL175,424D,C280,317,319,1537,87V/C/E2,287C,914X,TI480,TIS50,A3001 FC,TIS55,561,562,563,820-2,700PEX,I1010,279 FC,7526A,6500-2,2645A,C23,L200,TL26A,TP38,179C,C25,9040,TI450,A3000 FC,TIS20,8845A,L206,TI32S,8846A,709H,1555,414D,9118A,700HPPK,TP40,28II EX,C33,C35,1623-2,289C,TIX580,342,101,586,345,106,107

10/2017 - FLUKE - 选型指南

Keysight（是德科技）基础测量仪器选型指南

目录- Spotlight Special Offers and Events Pathwave Benchvue Software Oscilloscopes Data Acquisition/Switch Units Digital Multimeters DC Power Supplies Source Measure Units Electronic Loads Waveform Generators Signal Generators Signal Analyzers Vector Network Analyzers FieldFox Handheld Analyzers

型号- 33521B,B2911B,PZ2120A,PZ2100,P9377B,34460A,DAQM905A,N9324C,1000X,3458A,N9918A,EL34143A,33600A SERIES,BV0003B,E36155A,BV9210B,DAQ973A,B2962B,N9935A,PZ2121A,P9243A,P93XXB,P937XA,P937XB,34972A,EL30000 SERIES,E5063A,E36154A,3000X,P9371B,P9371A,33600A,PZ2130A,B2961B,33612A,34470A,DAQM903A,B2960B SERIES,N9322C,N9960A,E36311A,6000X,E36731A,PZ2100 SERIES,N6701C,P9370A,P9382B,3000G X-SERIES,P9370B,PZ2131A,B2960B,33611A,33500B SERIES,PW9251A,DAQM904A,N6700 SERIES,34970A,N9323C,34465A,B2901BL,EXR-SERIES,E36150ADVU,N6700C,EL34243A,E36150 SERIES,DAQ970A,E36150,P9373B,BV9201B,E36300 SERIES,33622A,P9373A,P397XA,33509B,2000X,DAQM909A,E36313A,1000 X-SERIES,DAQM900A,E36232A,33512B,P9372A,P9384B,33500B,33621A,P9372B,N5181B,A-SERIES,N9321C,DAQM902A,N6700,E36200 SERIES,N755XA,B2902B,E36300,2000 X-SERIES,4000X,E36312A,DAQM901A,4000 X-SERIES,ENA,E36231A,N6702C,6000 X-SERIES,N9952A,B2901B,33511B,N5166B,N6705C,BV9211B,P9375B,P9242A,B2900B SERIES,PZ2110A,P9375A,33519B,DAQM907A,EL30000,E36234A,B2910BL,35520B,33510B,B2900B,B2912B,33522B,BV9200B,P9374A,N5171B,P9374B,P9241A,N9913A,P938XB,N9925A,X-SERIES,N1500A,DAQM908A,E36200,34461A,E36233A,ENA SERIES

July 18, 2023 - KEYSIGHT - 选型指南

【测试测量仪器合辑】直流电源分析仪、台式直流电源、数字万用表、手持频谱仪

还有更多资讯文章和选型资料等你哟~

2017-07-10 - 专题合辑

Keysight（是德科技）数字万用表选型指南（详细版）

目录- Digital Multimeter Index Accessories Compatibility Chart Linking up your instruments to the PC BenchVue Software Handheld meter logger software GPIB and instrument

型号- U1191A,U1272A,34460A,34133A,34420A,34161A,U1210,10833F,10833G,34307A,10833A,10833B,10833C,10833D,U1232A,U1583B,3458A,U1163A,3446MEMU,U1175A,U1595A,3446SECU,U1180A,3446DIGU,U1192A,U8202A,34398A,U2741A,34172B,U1280 SERIES,34104A,U1176A,U1273A,U1164A,U1233A,34171B,3446ACCU,U1282A,U1173B,U1161A,U1173A,34470A,34131A,U1270,U1240B SERIES,U1240C SERIES,U1117A,E3600A-100,34103A,U1242C,U1185A,U1242B,U1169A,U1190 SERIES,U1271A,U1162A,3446LANU,U1230 SERIES,3446GPBU,U1280,11059A,34194A,34465A,34102A,34138A,U3606B,U1231A,U1174A,U1594A,U1186A,U1270 SERIES,U1240C,U1183A,U1240B,U5404A,U1171A,3445MEMU,82350A,11062A,U1250,34137A,U1252B,U1115A,U1212A,U1179A,U1273AX,Y1133A,82357B,U1172A,U1241C,E2308A,U1184A,U1281A,U1580A,34330A,34136A,U1241B,U1253B,M9181A,U1213A,U1168B,34191A,U1181A,U1193A,U1190,U8201A,34450A,11060A,U1230,U1210 SERIES,U1177A,M9182A,34190A,U1194A,U1251B,U1170A,U1182A,34134A,U1250 SERIES,34162A,34461A,3445GPBU,34308A,U1586B,M9183A,U1211A,U1178A

August 18, 2022 - KEYSIGHT - 选型指南

Keysight（是德科技）汽车测试产品选型指南（英文）

目录- Increasing Speed, Safety, and Reliability of In-Vehicle Communications Networks Data Acquisition for Accurate Automotive System Analysis Taming the Hostile RF World of Today’s Vehicles Managing Power in a Harsh Automotive Electrical Environment EMI Pre-Compliance Testing for Automotive Designs Handheld Instruments for Accurate Portable Automotive Testing General Bench Test and Accessories Test Automation with PathWave BenchVue Software

型号- N7026A,DAQ970A,4000 X,N2790A,N6705C,N5166B CXG,N6700 SERIES,3000T X-SERIES,N6700,3000T X,34980A,S-SERIES,6000 X,N9000B CXA,N7900,4000 X-SERIES,MSOX4154A,6000 X-SERIES,N7900 SERIES

October 31, 2022 - KEYSIGHT - 选型指南