法安级的电流该如何测量？

时间： 2024-06-19 来源：是德科技 Keysight Technologies知乎

电阻最常见的测试仪器是数字万用表，它的测量范围高达约200 MΩ。然而，在某些情况下，必须准确测量千兆欧和更高范围的电阻。这些情况包括诸如此类的应用：表征高兆欧级电阻、确定绝缘体的电阻率和测量印刷电路板的绝缘电阻。这些测量可以使用一个皮安表/电压源来实现，利用精密高电压源和皮安表测量能力做出准确的电阻测量。

高电阻测量通常使用恒定电压法。使用皮安表的恒定电压法的基本设置如下图所示。

皮安表能够进行万用表无法进行的测量

2pA至20毫安量程和内部1000V电源确保精确的0.01fa和10PΩ测量能力

皮安表的优点:

•高电阻值是一种要求高灵敏的测量方法，因为它意味着很小的电流

•eM/pA通常用于<10 nA和>10 GΩ的测量

這裏我們总结了客户需要皮安表或静电计的典型情况。数字万用表通常只能测量高达10GigaΩ(千兆欧姆)的电阻，因此任何电阻大于此值的设备都需要类似B2980A皮安表的设备。

皮安计 B2981B 飞安计/皮安计，0.01 fA

两个关键点：

非常高的电阻测量意味着需要测量低电流，因为电流与电压除以电阻成正比。请注意，您还需要一个相当高的电压源（即1000伏），以保持电流在静电计的可检测范围内。当测量小于10毫安的电流或大于10千兆欧姆的电阻时，需要使用皮安表或静电计。

皮安表和静电计有什么区别？

什么是皮安表? 皮安表是超精密的电流表。

什么是静电计? 静电计是高性能的万用表。对于低电流（<10nA）和高电阻（>1 GΩ）等敏感器件测量至关重要。

典型的 pA/eM 功能

典型的 pA/eM 功能

*大多数皮安表不能提供电压源；但是，有一些型号有内置的电压源

**大多数静电计都有内置的电压源。有些型号没有

皮安表只是测量电流的仪表（在这种情况下是非常低的电流）。它没有任何测量或提供电压的能力。相反，静电计包括皮安表的能力，但增加了测量电压和电流的能力。此外，一般来说，静电计还包括一个电压源，这样你就可以用静电计给设备或样品施加电压，并测量通过它的电流。

举个例子，静电计可以施加高达1000伏的电压。电压很高，因为电流与电压除以电阻成正比。为了测量非常大的电阻，你还需要一个相对大的电压；否则电流很小（对于大电阻设备来说），即使是非常精确的皮安计也无法测量。

哪里会需要用到皮安表/静电计？

新材料如石墨烯、碳纳米管（CNT）、电介质、铁电体、聚合物等需要更灵敏的测量。

数字万用表（DMM）只能测量低至10nA的电流。对于小于此值的电流，最好选择皮安计或静电计。事实上，对于这一级别的电流来说，这是唯一的选择。

静电计的工作原理

静电计，又叫电势差计或指针验电器，是静电实验中常用的半定量测量仪器。

静电计的工作原理基于库仑定律，即同种电荷之间的作用力与它们之间的距离的平方成反比。因此，如果我们知道电荷之间的距离和它们之间的作用力，我们就可以计算出它们的电荷量。静电计利用这一原理用来检验物体所带电荷的种类并且测量电量。

静电计是在验电器的基础上改造而成的，静电计由的两部分构成，静电计与电容器的两部分分别接在一起，则电容器上的电势差就等于静电计上所指示的，μ的大小就从静电计上的刻度读出。

静电计的工作原理

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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

【选型】Keysight（是德科技）通用及基础测量仪器样本

目录- 示波器和探头数字万用表数字采集和开关频率计数器、函数和任意波形发生器电源射频仪表

型号- U1272A,34460A,34133A,53140,N5742A,N5766A,E4980ALU-050,N2919A,N576XA,N5439A,6644A,661XC-220,54600S,34905A,3446MEMU,3000X,U2700,N674XB,34132A,34132B,53150,N5743A,53151,N5767A,661XC-OL2,664XA,3024T,N2918A,6621A,3000T,53152,6645A,N2918B,N9310A-1CM,661XC-230,U1273A,34904A,U1620,E364XA-1CM,N6746B,3000X,DSOXGPIB,N8948A,1000,34131A,DSOX4AUTO,N5744A,N5768A,N2917B,6622A,N3300A,8120-4383,TPS://WWW.SEKORM.COM/WEB/SEARCH/KEYWORDN2801A,34903A,663XB-0B3,DSOX4SENSOR,N8900A,66102A,N6701A,E5387A,66000,U1271A,N8949A,66002A 66001A,11059A,6624A,N5745A,668XA-0B3,8120-5488,N5769A,3022T,6623A,N3301A,33500,8120-5489,34902A,66101A,N9340B-AMA,N2916B,U1600,N6700B,33509B,N7020A,6625A,DSOXLAN,4000X,N3302A,N5746A,8120-5413,8120-6502,N2874,8120-5412,N574XA,U1604A,8120-6980,34901A,34925A,66104A,8120-6507,N2915A,8120-5414,U2802A,66321D,N9310A-1HB,DSO1072B,66321B,663XB-760,B2902A,4000X,6626A,N3303A,N5747A,8120-5421,N2829A,N2862,600,66103A,34924A,N2805A,N6702A,N6705B,N9330B,668XA-909,B2901A,6627A,668XA-908,N3304A,U1602A,N2828A,N5748A,34923A,34947A,8120-8705,N2804A,66106A,6628A,891A,669XA-0L2,N3305A,N5749A,34922A,E5805A,34946A,N2827A,60XX-220,N2803A,66105A,U8001A,DSOX4EMBD,N2849A-68701,1000B,3000,1000A,TPS://WWW.SEKORM.COM/WEB/SEARCH/KEYWORD54600S,N3306A,DSOX4MASK,U1600A,U1210,N2791A/N2891A,34921A,6575A,34945A,1158A,6551A,6684A,3446SECU,N2826A,5485X,N2802A,E363XA-0L2,1134A,DSO1052B,34172B,N3307A,657XA,U3400,6552A,N2801A,60XX-240,5462X,N2825A,34171B,N9340B-ADP,DSOX2000,33612A,33503A,1131A,N9310A,663XB-8ZJ,U1731B,6553A,N2800A,N3300A-UJ1,N2739A,N2848A,N2824A,8121-0695,8121-0694,DSOX2APPBNDL,33611A,B2960A,U8002A,E4980ALU-201,N33313A,1132A,DSOX2AUTO,8120-43831,U3606A,U1732B,6554A,34942A,681XB-1CP,BNC,1157A,U3606B,5464X,681XB-1CM,2000 X,N2738A,DSOX3ADVMATH,6551,N9340B-ABJ,8120-5490,8121-1330,N9340B-ABA,2000X,8121-1331,655XA,8120-8767,53100,8120-8768,34941A,6555A,34832A,663XB-120,N2822A,N9340B-AB2,3000TX,33500B,N5,N9330B-ADP,1130A,U2600A,N9340B-PA3,DSOX3EMBD,200,6641A,669XA-0B3,1131.,N2821A,DSOX3MASK,4000 X,5000,N3300,AC6800,6642A,34830A,N7900,N2820A,N2759A,33522A,33522B,1180CZ,663XB-100,DSOX4COMP,N9310A-1T,N9340B-TG3,6643A,N2867A,N2843A,U1401B,N9340B-INM,AC6804A,DSOX3AUDIO,34840B,DSOX4FLEX,669XA-908,669XA-909,N2733A,N2866B,N2733B,3458A-002,DSOX2EMBD,3458A-001,E2695A,DSO1012A,34972A,N9310A-1TC,60001,N2889A,N2756A,6063B-020,N2732A,AC6802A,6000A,U1270,6000X,DSO1014A,U1880A,N9340B-TAD,90000 X,663XB-020,N2779A,N2888A,6000L,DSOX3COMP,E2697A,N2863B,AC6803A,U2751A,34970A,L4411A,6000X,34401A,N9330B-202,N9330B-203,U1881A,N9330B-201,N2778A,N2887A,54826,8120-1689,7000,N2862B,E4980A-710,668XA-208,54830,U1250,DSOXEDK,6571A,681XB-208,N875XA,N2777A,6680A,N8756A,N8732A,N8950A,TPS://WWW.SEKORM.COM/WEB/SEARCH/KEYWORD1163A,E3610-17A,AC6801A,DSOX3FLEX,681XB-200,10070D,N2885A,N2752A,N5440A,E3451B,81180A,U2531A,54600,6572A,E4980AL-100,6681A,N8757A,N2776A,U3402A,N8733A,53147A,8120-2956,N8951A,681XB-230,N2884A,N2751A,N7971A,DSO1102B,6641A-45A,DSOX2COMP,64997A,6682A,U1230,6573A,U3401A,N6773A,B2980A,N8754A,N7970A,N2750A,DCA-J 86100D,53230A,6813B-019,N5442A,6631BA,8120,6574A,6683A,54620,U1240,N8755A,5484X,N8731A,N2797A,N5770A,N2882A,N873XA,N5443A,34420A,N7973A,10073D,DSOXDVM,E2678A,80000,N28,N6775A,N8736A,8120-2104,N6751A,N8954A,DSOX4PWR,N2881A,E2655C,6063B,N2796A,N5444A,P66321B,N5771A,6812B,N7972A,10074D,E2679A,N5468A,N9340B-XDM,6811B,11053A,9000X,N8737A,N6774A,DSOX3MSO,N8955A,E3634A,N2771B,N2880A,DSOXPERFMSO,N6450,N2795A,N5772A,N5469A,9000,6813B,N5445A,U2356A,8121-6203,N7951A,N6459,N6753A,N8758A,U1242B,N6971A,N8734A,33220A,N8952A,N6777A,681XB-026,53181A,681XB-020,U2331A,661XC-760,10072A,N7950A,60XX-0B3,U2355A,N7974A,DSOX4AUDIO,34465A,E5813A,34138A,E4356A-909,E4356A-908,U1461A,N8759A,N6752A,N6970A,N8735A,N677XB,N6776A,N2793A,N9340B-IBC,U1591A,11058A,U2354A,N5750A,N7953A,N7977A,N5447A,N5423A,E5810B,E5810A,N6731B,N6973A,N2914,DSOX4APPBNDL,661XC-0B3,E3631A,N6755A,N2792A,DSOX3VID,E2675A,DSOX2MASKM,34330A,U2353A,N7976A,E4980AL,N5751A,N9340B-1TC,N5448A,N5424A,N7952A,34136A,DSOX2SEM,N3331A,N6972A,U1241B,E3630A,DSOX4AERO,34908A,N6754A,E2676A,N2791A,N9330B-1TC,N8738A,10075A,U2352A,N5752A,N5425A,U1452AT,3000T X,N577XA,N5449A,DSOXT3DVMCTR,7000B,TPS://WWW.SEKORM.COM/WEB/SEARCH/KEYWORD10076C\,3000 X,U2700 USB,U1177A,N6951A,E363XA-1CM,N2836A-68701,34907A,E3633A,N6733B,E2677A,N9310A-001,N2790A,N675XA,66000A-909,E4980A-301,N8739A,66000A-908,N7954A,10076B,34134A,10076C,U2351A,N5426A,34461A,66319B,8120-4753,N6732B,N6950A,N8957A,E3632A,34906A,N6756A,N6974A,66319D,N9330B-BCG,B2911A,N2111A,8120-5570,N9340B,E2614A,1161A,DSOX3AERO,6632B,8120-5572,N1022B,8120-5573,33250A,54830S,8120-5337,N6735B,N6977A,N6711A,N6953A,661XC-100,1162A,E2615A,6633B,34945EXT,N9330B-BAT,3012T,8120-5342,N6710B,66002A,N6976A,90000Z,N6734B,N6952A,DSOX4WAVEGEN2,90000X,U8031A,663XB-1CM,90000Q,663XB-1CP,34470A,E2616A,N575XA,6634B,8120-6204,661XC-120,90000A,66332A,6651A-55,DSOX2WAVEGEN,34939A,N673XB,1132,1131,82351A,1160A,N2819A,6611C,3034T,N5406A,8120-8871,66000A-0L2,34938A,N6736B,N6954A,N6712A,90000,E5396A,N9320B,6612C,N2818A,E

2015年06月10日 - KEYSIGHT - 选型指南 - 2015

Keysight（是德科技）台式和电源产品选型指南

目录- Company Profile Data Acquisition DC Power Supplies PathWave BenchVue AC Single-Phase Power Sources DC Electronic Loads Semiconductor Device Analyzer Precision Bench Instruments Gurrent Waveform Analyzer InfiniiVision Oscilloscopes Data Acquisition / Switch Units Waveform Generators Digital Multimeters

型号- E3640,33521B,B2987A,B2911A,M9240GENB,INFINIIUM S-SERIES,34460A,DAQM905A,D6000GENA,U8000,3000T X-SERIES,M9240NFCB,1000X,D3000GENA,D3000NFCA,D4000NFCA,D2000GENA,N5700,D4000GENA,N6791A,PV8921A,3458A,CX1103A,CX3322A,E3630,DAQ973A,RP7900 SERIES,B2962A,D6000BDLA,3000T,N6900,D4000BDLA,B2960,N5700 SERIES,P9240AUTB,B1506A,3000X,P9240NFCB,CX1102A,B2985A,M9111A,33600A,33612A,B2961A,E36100B SERIES,U8000 SERIES,34470A,DAQM903A,E36311A,6000X,33600A SERIES,D6000AERA,N3300A,DG9000,M9601A,D6000USBA,M9240AERB,6800,D2000AUTA,B1505A,B2960 SERIES,D3000AUTA,33611A,N6700 SERIES,DAQM904A,N8900,E3640 SERIES,B2900,33500B SERIES,34465A,N8900 SERIES,M9240BDLB,B2980,CX1104A,D6000PWRA,DAQ970A,BV9201B,N6790,P9240A,E36300 SERIES,33622A,P9240AERB,B2983A,33509B,2000X,DAQM909A,M9615A,1000 X-SERIES,DAQM900A,B2900 SERIES,U8030 SERIES,D6000AUTA,PV8900,AC6800 SERIES,N8700 SERIES,D4000AUTA,AC6801B,P9240BDLB,33512B,N6780,33500B,33621A,E3630 SERIES,DAQM902A,E36200 SERIES,N6700,E36300,B2902A,2000 X-SERIES,4000X,M9240PWRB,N6705,D3000PWRA,E36312A,N6900 SERIES,M9614A,DAQM901A,4000 X-SERIES,6800 SERIES,6000 X-SERIES,M9240A,N6705C,33511B,B2981A,D2000BDLA,P9240GENB,33519B,B2901A,RP7900,DAQM907A,AC6800,N3300A SERIES,D4000AERA,D3000AERA,N7900,D4000USBA,CX3324A,35520B,CX1101A,CX3300A,N7900 SERIES,33510B,33522B,N8700,B2980 SERIES,M9240AUTB,E36200,B2912A,DAQM908A,U8030,N6780 SERIES,34461A,B1500A,D3000BDLA,E36100B,D4000PWRA

April 23, 2021 - KEYSIGHT - 选型指南

【经验】N2820A双信道高灵敏度电流探头用于50µA高灵敏度低功耗测试方案，保证小信号和高电流的采集

是德科技（Keysight）推出了一系列低功耗测试方案，有最高动态范围的N6705C+N6781A，也有最高带宽的CX3300系列，也有静态功耗测试噪声最低的皮安表B2981A。本文将介绍一个新的示波器+探头测试方案，Keysight的N2820A双信道高灵敏度电流探头。

2022-03-26 - 设计经验

电阻测量原理和电阻率测试方法

介绍电阻测量原理和如何使用静电计/高阻表和电阻盒进行电阻率测试？

2024-03-15 - 技术探讨

【产品】轻松测量低至0.01fA电流的具有多功能视图模式的微安计/皮安计

Keysight公司新推出的B2981A的测量分辨率高达6.5位，电流测量的最小量程为2pA，读取速率高达20000读数/秒。除此，它可存储多达100000个数据点以备用户日后检索，高达100kHz采样率的时域视图能够显示实时测量的趋势。

2018-02-13 - 新产品

Keysight（是德科技） B2980A 系列飞安表/皮安表静电计/高阻表

描述- Keysight B2980A 系列飞安表/皮安表和静电计/高阻表配置指南详细介绍了该系列产品的配置步骤和可选附件。指南包括选择型号、添加用户指南、生产效率工具、可选附件以及保修和校准方案。该系列仪表具备高灵敏度，可测量低至 0.01 fA 的电流和高达 10 PΩ 的电阻。

型号- 16493B-001,B2987A,16493B-002,16008B,16339A,B2983A,N1414A,U2921A-100,B2981-61715,N1418A,N1403A-ABA,N1422A,N1410A,16117C,16117B,1250-2618,B2985A-A6J,B2985A-UK6,N1413A,34398A,N1417A,N1415,16494A-001,16494A-005,16494A-004,R-51B-001-5F,16494A-003,16494A-002,B2985A,B2981/83/85/87A,B2981A-UK6,B2981A,U8201A,N1416A,B2987A-A6J,B2981A-A6J,N1420A,N1254A-104,N1254A-102,B2980A,N1299A-301,B2987A-UK6,N1254A-105,R-50C-011-3,N1415A,N1423A,N1419A,R-50C-011-5,B2983A-UK6,N1411A,N1411B,B2980,B2983A-A6J,U8201-60001

September 1, 2014 - KEYSIGHT - 用户指南