数字万用表使用方法.pdf
数字万用表使用说明书
manual before starting using the instrument. • Save and keep the manual handy to enable quick
(4 ranges) Terminal Voltage:
# CAUTION is reserved for conditions and actions that can cause injury or instrument damage.
# DANGER • Never make measurement on a circuit in which the
# DANGER is reserved for conditions and actions that are likely to cause serious or fatal injury.
# WARNING is reserved for conditions and actions that can cause serious or fatal injury.
The symbol # indicated on the instrument means that the user must refer to related parts in the manual for safe operation of the instrument. Be sure to carefully read the instructions following each symbol in the manual.
4. SPECIFICATIONS
106 107 数字万用表用户手册说明书
June 2013, Rev. 1, 10/15 © 2013-2015 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.106/107 Digital MultimetersTable of ContentsTitle Page Introduction (1)How to Contact Fluke (1)Safety Information (2)Instrument Overview (8)Terminals (8)Display (9)Auto Power Off (10)Auto Backlight Off (11)Measurements (11)Data Hold (11)Measure AC and DC Voltage (12)Measure AC or DC Current (14)Measure Resistance (16)Test for Continuity (16)Test Diodes (107 Only) (18)i106/107 Users ManualiiMeasure Capacitance (19)Measure Frequency and Duty Cycle (107 Only) (19)Maintenance (20)General Maintenance (21)Test the Fuse (22)Replace Batteries and the Fuse (22)Service and Parts (24)General Specifications (25)Accuracy Specifications (28)Digital Multimeters Safety Information3WarningTo prevent possible electrical shock, fire, or personal injury:• Carefully read all instructions.• Read all safety information before you use the Product. • Use the Product only as specified, or the protection supplied by the Product can be compromised.• Do not use the Product around explosive gas, vapor, or in damp or wet environments.• Do not use the Product if it is damaged.• Disable the Product if it is damaged.• Do not use the Product if it operates incorrectly.• Examine the case before you use the Product. Look for cracks or missing plastic. Carefully look at the insulation around the terminals.• Use only correct measurement category (CAT), voltage, and amperage rated probes, test leads, and adapters for the measurement.• Measure a known voltage first to make sure that the Product operates correctly.106/107 Users Manual4 •Do not use test leads if they are damaged. Examine the test leads for damaged insulation and measure a known voltage.•Do not apply more than the rated voltage, between the terminals or between each terminal and earth ground.•Do not use the HOLD function to measure unknown potentials. When HOLD is turned on, the display does not change when a different potential is measured. •Do not touch voltages >30 V ac rms, 42 V ac peak, or 60 V dc.•Keep fingers behind the finger guards on the probes.•Remove all probes, test leads, and accessories before the battery door is opened.•Do not exceed the Measurement Category (CAT) rating of the lowest rated individual component of a Product, probe, or accessory.•Remove the input signals before you clean the Product.•Have an approved technician repair the Product.•Remove the batteries if the Product is not used for an extended period of time, or if stored in temperatures above 50 °C. If the batteries are not removed,battery leakage can damage the Product.Digital Multimeters Safety Information 5• Replace the batteries when the low battery indicator shows to prevent incorrect measurements.• Use only specified replacement parts.• Use only specified replacement fuses.• Limit operation to the specified measurement category, voltage, or amperage ratings.• Do not use test leads if they are damaged. Examine the test leads for damaged insulation and measure a known voltage.• Do not use in CAT III or CAT IV environments without the protective cap installed. The protective cap decreases the exposed probe metal to <4 mm. This decreases the possibility of arc flash from short circuits.106/107 Users Manual6Table 1 is a list of the symbols used on the Product and in this manual. Table 1. SymbolsConsult user documentation. WARNING. RISK OF DANGER. Static awareness. Static discharge can damage part(s). WARNING. HAZARDOUS VOLTAGE.Risk of electric shock.AC (Alternating Current) EarthDC (Direct Current) CapacitanceBoth direct and alternating current DiodeBattery FuseConforms to relevant South KoreanEMC Standards Certified by TÜV SÜD Product Service. Conforms to European Union directives. Certified by CSA Group to North Americansafety standards.Digital Multimeters Safety Information 7 Table 1. Symbols (cont.)Measurement Category II is applicable to test and measuring circuits connected directly to utilization points (socket outlets and similar points) of the low-voltage MAINS installation.Measurement Category III is applicable to test and measuring circuits connected to the distribution part of the building’s low-voltage MAINS installation. Measurement Category IV is applicable to test and measuring circuits connected at thesource of the building’s low-voltage MAINS installation.This product complies with the WEEE Directive marking requirements. The affixed label indicates that you must not discard this electrical/electronic product in domestic household waste. Product Category: With reference to the equipment types in the WEEE Directive Annex I, this product is classed as category 9 "Monitoring and Control Instrumentation" product. Do not dispose of this product as unsorted municipal waste.8Digital Multimeters Instrument Overview9DisplayFigure 1 and Table 2 show the items on the Product display.hhc02.epsFigure 1. Display106/107 Users Manual10 Table 2. DisplayItem Description Item DescriptionHighvoltage Frequency is selected Display Hold is enabled FaradsContinuityselected MillivoltsDiode test is selected Amps or voltsDuty Cycle is selected Dc or ac voltage or currentDecimalprefix Auto Range mode is enabled Ohmsisselected Low battery. Replace battery. Auto Power OffThe Product automatically powers off after 20 minutes of inactivity.To restart the Product, turn the rotary switch back to the OFF position and then to a necessary position.To disable the Auto Power Off function, hold down the YELLOW button when turning on the Product, until PoFF shows on the display.Digital Multimeters Auto Backlight Off11Auto Backlight OffThe backlight automatically turns off after 2 minutes of inactivity.To disable the Auto Backlight Off function, hold down when turning on the Product, until LoFF shows on the display.NoteTo disable both the Auto Power Off function and the Auto Backlight Off function, hold down the YELLOW button and at the same time, until both PoFF and LoFF show on the display.MeasurementsData HoldWarningTo prevent possible electrical shock, fire or personal injury, do not use the HOLD function to measure unknown potentials. When HOLD is turned on, the display does not change when a different potential is measured.To hold the present reading, push . Push again to continue normal operation.106/107Users Manual12Measure AC and DC Voltage To measure ac and dc voltage:1. Choose ac or dc by turning the rotary switch to or .2. Connect the red test lead to the terminal and the black test lead to the COMterminal. 3. Measure the voltage by touching the probes to the correct test points of the circuit. 4. Read the measured voltage on the display.Digital MultimetersMeasurements13Figure 2. Measure AC and DC Voltage106/107Users Manual14Measure AC or DC CurrentWarningTo prevent possible electrical shock, fire, or personal injury, remove circuit power before you connect the Product in the circuit when you measure current. Connect the Product in series with the circuit. 1. Turn the rotary switch to .2. Push the YELLOW button to toggle between ac or dc current measurement.3. Connect the red test lead to the A terminal to be measured and connect the black testlead to the COM terminal. 4. Break the circuit path to be measured.5. Connect the test leads across the break and apply power.6. Read the measured current on the display.Digital MultimetersMeasurements15Figure 3. Measure AC and DC Current106/107Users Manual 16Measure Resistance1. Turn the rotary switch to (106 does not have ). Make sure power is disconnectedfrom the circuit to be measured. 2. Connect the red test lead to the terminal and the black test lead to the COMterminal. 3. Measure the resistance by touching the probes to the desired test points of the circuit. 4. Read the measured resistance on the display. Test for ContinuityWith the resistance mode selected, push the YELLOW button once to activate the continuity mode. If the resistance is <70 Ω, the beeper sounds continuously, designating a short circuit. If the Product reads , the circuit is open.Digital MultimetersMeasurements17Figure 4. Measure Resistance/Continuity106/107Users Manual18Test Diodes (107 Only) 1. Turn the rotary switch to .2. Push the YELLOW button twice to activate the diode test mode.3. Connect the red test lead to the terminal and the black test lead to the COMterminal. 4. Connect the red probe to the anode and the black test lead to the cathode of the diodebeing tested. 5. Read the forward bias voltage value on the display.6. If the polarity of the test leads is reversed with diode polarity, the display reading shows. This can be used to distinguish the anode and cathode sides of a diode.Digital MultimetersMeasurements19Measure Capacitance 1. Turn the rotary switch to .2. Connect the red test lead to the terminal and the black test lead to the COMterminal. 3. Touch the probes to the capacitor leads. 4. Let the reading stabilize (up to 18 seconds). 5. Read the capacitance value on the display. Measure Frequency and Duty Cycle (107 Only)The Product can measure frequency or duty cycle while making either an ac voltage or an ac current measurement.1. Pushto change the Product to frequency or duty cycle. 2. When the Product is in the required function (ac voltage or ac current), push . 3. Read the frequency on the display.4. To make a duty cycle measurement, push again.5. Read the percent of duty cycle on the display.106/107Users Manual20MaintenanceBeyond replacing the batteries and fuse, do not attempt to repair or service the Product unless you are qualified to do so and have the relevant calibration, performance test, and service instructions. The recommended calibration cycle is 12 months.WarningTo prevent possible electrical shock, fire, or personal injury: • Remove the input signals before you clean the Product. • Use only specified replacement parts. • Use only specified replacement fuses.• Have an approved technician repair the Product.For safe operation and maintenance of the Product, repair the Product before use if the batteries leak.Digital MultimetersMaintenance21General MaintenancePeriodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the terminals can affect readings. To clean the terminals:1. Turn the Product off and remove the test leads.2. Shake out any dirt that may be in the terminals.3. Soak a new swab with isopropyl alcohol and work around the inside of each inputterminal. 4. Use a new swab to apply a light coat of fine machine oil to the inside of each terminal.106/107Users Manual 22Test the Fuse1. Turn the rotary switch to (106 does not have ).2. Plug a test lead into the terminal and touch the probe to the A terminal.• A good A terminal fuse is indicated by a reading less than 0.1 Ω. • If the display reads , replace the fuse and test again.• If the display shows any other value, have the Product serviced. See Service andParts . Replace Batteries and the FuseTo replace the batteries or the fuse, see Figure 5.CautionBe sure to observe Electro Static Discharge precautions.Digital Multimeters Service and Parts23Figure 5. Replace Batteries and the Fuse106/107Users Manual24Service and PartsIf the Product fails, first check the batteries and fuse. Then, review this manual to make sure you are operating the Product correctly. Replacement parts are:ItemFluke Part NumberBatteries 2838018Battery door 4319659 Test leads TL1754306653Fuse 803293 Screws 4320657Digital Multimeters General Specifications25General SpecificationsMaximum voltage between any terminaland Earth Ground ............................................................ 600 VFuse protection for A input ............................................ 11 A, 1000 V, IR 17 kA Display (LCD)................................................................... 6000 counts, updates 3/sec Battery Type .................................................................... 2 AAA, NEDA 24A, IEC LR03 Battery Life ...................................................................... 200 hours minimum TemperatureOperating ...................................................................... 0 °C to 40 °C Storage ......................................................................... -30 °C to 60 °C Relative HumidityOperating Humidity ....................................................... Non-condensing when <10 °C;≤90 % at 10 °C to 30 °C; ≤75 % at 30 °C to 40 °C Operating Humidity, 40 M Ω Range ............................... ≤80 % at 10 °C to 30 °C;≤70 % at 30 °C to 40 °C AltitudeOperating ...................................................................... 2000 m Storage ......................................................................... 12,000 m106/107Users Manual26Temperature Coefficient ................................................. 0.1 X (specified accuracy) / °C (<18 °C or>28 °C) Size (HxWxL).................................................................... 142 mm x 69 mm x 28 mm Weight .............................................................................. 200 gIP Rating ........................................................................... IEC 60529: IP 40 SafetyGeneral ......................................................................... IEC 61010-1: Pollution Degree 2 Measurement ................................................................ IEC 61010-2-033: CAT III 600 V Electromagnetic Compatibility (EMC)International .................................................................. IEC 61326-1: Portable, IEC 61326-2-2CISPR 11: Group 1, Class A Group 1: Equipment has intentionally generated and/or uses conductively-coupled radio frequency energy that is necessary for the internal function of the equipment itself.Class A: Equipment is suitable for use in all establishments other than domestic and those directly connected to a low-voltage power supply network that supplies buildings used for domestic purposes. There may be potential difficulties in ensuring electromagnetic compatibility in other environments due to conducted and radiated disturbances.Digital Multimeters General Specifications27Emissions that exceed the levels required by CISPR 11 can occur when the equipment is connected to a test object. The equipment may not meet the immunity requirements of this standard when test leads and/or test probes are connected.Korea (KCC) ................................................................. Class A Equipment (Industrial Broadcasting &Communication Equipment) Class A: Equipment meets requirements for industrial electromagnetic wave equipment and the seller or user should take notice of it. This equipment is intended for use in business environments and not to be used in homes.USA (FCC) ................................................................... 47 CFR 15 subpart B. This product is consideredan exempt device per clause 15.103.106/107Users Manual28Accuracy SpecificationsAccuracy is specified for 1 year after calibration, at operating temperatures of 18 °C to 28 °C, relative humidity at 0 % to 75 %. Accuracy specifications take the form of: ±([% of Reading] + [Number of Least Significant Digits]).Function Range Resolution Accuracy 106 107 AC Volts(40 Hz to 500 Hz) [1]6.000 V 60.00 V 600.0 V 0.001 V 0.01 V 0.1 V 1.0 % + 31.0 % + 3DC Volts6.000 V 60.00 V 600.0 V 0.001 V 0.01 V 0.1 V 0.5 % + 3 0.5 % + 3AC Millivolts600.0 mV0.1 mV3.0 % + 3 3.0 % + 3Diode Test [2]2.000 V 0.001 V N/A 10 %[1] All AC, Hz, and duty cycle are specified from 1 % to 100 % of range. Inputs below 1 % of range are not specified. [2] Typically, open circuit test voltage is 2.0 V and short circuit current is <0.6 mA.Digital MultimetersAccuracy Specifications29FunctionRange Resolution Accuracy106 107 Resistance400.0 Ω 4.000 k Ω 40.00 k Ω 400.0 k Ω 4.000 M Ω 40.00 M Ω 0.1 Ω 0.001 k Ω 0.01 k Ω 0.1 k Ω 0.001 M Ω 0.01 M Ω 0.5 % + 3 0.5 % + 2 0.5 % + 2 0.5 % + 2 0.5 % + 2 1.5 % + 3 0.5 % + 3 0.5 % + 2 0.5 % + 2 0.5 % + 2 0.5 % + 2 1.5 % + 3 Capacitance [1]50.00 nF 500.0 nF 5.000 µF 50.00 µF 500.0 µF 1000 µF0.01 nF 0.1 nF 0.001 µF 0.01 µF 0.1 µF 1 µF2 % + 5 2 % + 5 5 % + 5 5 % + 5 5 % + 5 5 % + 52 % + 5 2 % + 5 5 % + 5 5 % + 5 5 % + 5 5 % + 5106/107 Users Manual30Function Range ResolutionAccuracy106 107Frequency [2]Hz(10 Hz to 100 kHz)50.00 Hz500.0 Hz5.000 kHz50.00 kHz100.0 kHz0.01 Hz0.1 Hz0.001 kHz0.01 kHz0.1 kHzNA 0.1 % + 3 Duty Cycle [2] 1 % to 99 % 0.1 % NA 1 % typical [3][1] Specifications do not include errors due to test lead capacitance and capacitance floor (may be up to 1.5nF in the50nF range).[2] All AC, Hz, and duty cycle readings are specified from 1 % to 100 % of range. Inputs below 1 % of range are notspecified.[3] Typical means when the frequency is at 50Hz or 60Hz and the duty cycle is between 10 % and 90 %.Digital MultimetersAccuracy Specifications31Function Range ResolutionAccuracy 106 107 AC Current (40 Hz to 200 Hz)[1]4.000 A 10.00 A 0.001 A 0.01 A 1.5 % + 31.5 % + 3DC Current[1]4.000 A 10.00 A0.001 A 0.01 A1.5 % + 3 1.5 % + 3[1] 10 A duty cycle <7 minutes on, 20 minutes off, 25 °C to 40 °C.106/107 Users Manual32Function OverloadProtectionInput Impedance(Nominal)Common ModeRejection RatioNormal ModeRejection Ratio AC Volts 600 V [1] >10MΩ <100 pF [2]>60 dB at dc,50 Hz or 60 Hz_AC Millivolts 600 mV >1 M, <100 pF>80 dB at dc,50 Hz or 60 Hz_DC Volts 600 V [1] >10MΩ <100 pF>100 dB at50 Hz or 60 Hz>60 dB at50 Hz or 60 Hz[1] 6 x 105 V Hz Max.[2] For mV (AC), input impedance is approximately 1MΩ.。
物理实验：数字万用表使用手册
一．概述二．开箱检查三．安全工作准则四．国际电气符号五．综合指标六．外形结构图１．直流电压测量连接示意图九．测量操作说明八．显示符号说明２．交流电压测量４．电阻测量６．电路通断测量５．二极管测量８．频率测量七．按键功能１１２３３４６９１０１０１１３．直流或交流电流测量１３１５１８１７１９２０７．电容测量十．技术指标１．直流电压测量２．交流电压测量３．直流电流测量２１２１２１２２４．交流电流测量５．电阻测量２２２３２３２４２５（１）．直流电压２５（３）．直流电流２６２６（４）．交流电流２７（５）．电阻（６）．带直流偏置的交流电压校正２７（７）．带直流偏置的交流电流校正２７３１１．一般的保养和维修３２２．更换保险丝管十六．保养和维护３１十二．ＲＳ２３２Ｃ 标准串行接口２８十三．ＵＳＢ接口３０十四．接口软件的安装与使用３１十五．仪表误操作指示一览表３１UT805ＵＴ８０５使用说明书一、概述 ＵＴ８０５是一种５ １／２位台式真有效值数字万用表（以下简称仪表）。
整机电路设计以大规模集成模拟和数字电路相组合，采用微机技术以２４位Ａ／Ｄ转换器为核心、高精度的运算放大器、真有效值的交直流转换器、全电子调校技术赋于仪表高可靠性、高精度。
仪表可用于测量交直流电压、交直流电流、电阻、二极管、电路通断、电容、频率，并具备存储回读功能。
ＲＳ２３２Ｃ和ＵＳＢ接口技术的应用使其和计算机构成可靠多种的双向通讯。
仪表采用独特的外观设计，采用目前最时尚的ＶＦＤ显示器，仪表采用交流市电供电使之成为性能更优越的高精度电工仪表。
本使用说明书包括有关的安全信息和警告提示等，请仔细阅读有关内容并严格遵守所有的警告和警告：在使用仪表之前，请仔细阅读有关 安全信息和要求二、开箱检查 打开包装盒取出仪表，请仔细检查下列附件是否缺少或损坏，如发现有任何一项缺少或损坏，请即与你的供应商联系。
l 使用说明书 一本l 表笔 一副l 电源线 一根l 带护套鳄鱼夹 一副l ＲＳ２３２接口线 一根l ＵＳＢ接口线 一根l 转接插座 一个l 接口软件光盘 一张l ＵＮＩ－Ｔ中、英文保用证 一张UT805三、安全工作准则 本仪表严格遵循ＧＢ４７９３电子测量仪器安全要求以及安全标准ＩＥＣ１０１０－１和ＩＥＣ１０１０－２－０３２进行设计和生产。
数字万用表使用方法
2010-01-27 10:15数字万用表使用方法简介：数字万用表相对来说，属于比较简单的测量仪器。
本篇，作者就教大家数字万用表的正确使用方法。
从数字万用表的电压、电阻、电流、二极管、三极管、MOS场效应管的测量等测量方法开始，让你更好的掌握万用表测量方法。
一、电压的测量1、直流电压的测量，如电池、随身听电源等。
首先将黑表笔插进“com”孔，红表笔插进“V Ω”。
把旋钮选到比估计值大的量程（注意：表盘上的数值均为最大量程，“V－”表示直流电压档，“V～”表示交流电压档，“A”是电流档），接着把表笔接电源或电池两端；保持接触稳定。
数值可以直接从显示屏上读取，若显示为“1.”，则表明量程太小，那么就要加大量程后再测量工业电器。
如果在数值左边出现“-”，则表明表笔极性与实际电源极性相反，此时红表笔接的是负极。
2、交流电压的测量。
表笔插孔与直流电压的测量一样，不过应该将旋钮打到交流档“V～”处所需的量程即可。
交流电压无正负之分，测量方法跟前面相同。
无论测交流还是直流电压，都要注意人身安全，不要随便用手触摸表笔的金属部分。
二、电流的测量1、直流电流的测量。
先将黑表笔插入“COM”孔。
若测量大于200mA 的电流，则要将红表笔插入“10A”插孔并将旋钮打到直流“10A”档；若测量小于200mA的电流，则将红表笔插入“200mA”插孔，将旋钮打到直流200mA以内的合适量程。
调整好后，就可以测量了。
将万用表串进电路中，保持稳定，即可读数。
若显示为“1.”，那么就要加大量程；如果在数值左边出现“-”，则表明电流从黑表笔流进万用表。
交流电流的测量。
测量方法与1相同，不过档位应该打到交流档位，电流测量完毕后应将红笔插回“VΩ”孔，若忘记这一步而直接测电压，哈哈！你的表或电源会在“一缕青烟中上云霄”－－报废！三、电阻的测量将表笔插进“COM”和“VΩ”孔中，把旋钮打旋到“Ω”中所需的量程，用表笔接在电阻两端金属部位，测量中可以用手接触电阻，但不要把手同时接触电阻两端，这样会影响测量精确度的－－人体是电阻很大但是有限大的导体。
数字万用表的使用方法_快速学会电子技术（双色版）_[共7页]
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三、数字万用表的使用方法1．基本使用方法数字万用表是有源仪表，必须接上电源才能工作，因此使用数字万用表时应首先装上电池。
大多数数字万用表使用层叠电池，以DT890B型数字万用表为例，如图2-66所示，打开数字万用表后盖，装入1枚9V层叠电池，再将后盖盖好。
然后将表笔插入数字万用表的插孔中。
一般习惯上将红表笔按不同测量需要分别插入VΩ或mA 或A插孔，作为正表笔；将黑表笔插入COM插孔，作为负表笔。
按下控制面板上的电源开关（Power），LCD显示屏应有“000”字符显示。
如果显示出“BAT”字样，表示电池电压不足，应更换新电池。
图2-66 装入电池使用数字万用表进行测量时，首先应根据测量对象选择相应的挡位，然后估计测量对象的大小，选择合适的量程。
例如测量9V电池的开路电压，可选择直流电压20V挡，如图2-67所示。
如果无法估计测量对象的大小，则应先选择该挡位的最大量程，然后根据显示情况逐步减小量程，直至能够准确显示读数。
选择测量量程时，应尽量使LCD显示屏中显示较多的有效数字，以提高测量精度。
例如测量1.5V电池的开路电压，选择直流电压的200V、20V、2V挡均可测量，但2V挡显示的小数点后有效数字最多，因此测量精度较高，如图2-68所示。
如果显示屏仅在最高位显示“1”，表示测量对象超过所选量程，应选择更高量程进行测量。
2．测量直流电压测量直流电压时，红表笔插入VΩ插孔，为正表笔；黑表笔插入COM插孔，为负表笔。
转动测量选择开关至直流电压挡V，数字万用表构成直流电压表，直接并联于被测电压两端即可测量。
例如，需测量某电池GB的电压，将正表笔接电池正极、负表笔接电池负极，如图2-69所示，LCD显示屏即显示出被测电池的电压。
图2-67 测量挡位图2-68 选择小数点后较多有效数字图2-69 并联测量直流电压因为数字万用表具有自动显示正、负极性的功能，实际上测量过程中即使正、负表笔接反也能正确显示测量结果。
数字万用表的使用方法详细图解
现在，数字式测量仪表已成为主流，有取代模拟式仪表的趋势。
与模拟式仪表相比，数字式仪表灵敏度高，准确度高，显示清晰，过载能力强，便于携带，使用更简单。
下面以ＶＣ９８０２型数字万用表为例，简单介绍其使用方法和注意事项。
（１）使用方法ａ使用前，应认真阅读有关的使用说明书，熟悉电源开关、量程开关、插孔、特殊插口的作用．ｂ将电源开关置于ＯＮ位置。
ｃ交直流电压的测量：根据需要将量程开关拨至ＤＣＶ（直流）或ＡＣＶ（交流）的合适量程，红表笔插入Ｖ／Ω孔，黑表笔插入ＣＯＭ孔，并将表笔与被测线路并联，读数即显示。
ｄ交直流电流的测量：将量程开关拨至ＤＣＡ（直流）或ＡＣＡ（交流）的合适量程，红表笔插入ｍＡ孔（＜２００ｍＡ时）或１０Ａ孔（＞２００ｍＡ时），黑表笔插入ＣＯＭ孔，并将万用表串联在被测电路中即可。
测量直流量时，数字万用表能自动显示极性。
ｅ电阻的测量：将量程开关拨至Ω的合适量程，红表笔插入Ｖ／Ω孔，黑表笔插入ＣＯＭ孔。
如果被测电阻值超出所选择量程的最大值，万用表将显示１，这时应选择更高的量程。
测量电阻时，红表笔为正极，黑表笔为负极，这与指针式万用表正好相反。
因此，测量晶体管、电解电容器等有极性的元器件时，必须注意表笔的极性。
（２）．使用注意事项ａ如果无法预先估计被测电压或电流的大小，则应先拨至最高量程挡测量一次，再视情况逐渐把量程减小到合适位置。
测量完毕，应将量程开关拨到最高电压挡，并关闭电源。
ｂ满量程时，仪表仅在最高位显示数字１，其它位均消失，这时应选择更高的量程。
ｃ测量电压时，应将数字万用表与被测电路并联。
测电流时应与被测电路串联，测直流量时不必考虑正、负极性。
ｄ当误用交流电压挡去测量直流电压，或者误用直流电压挡去测量交流电压时，显示屏将显示０００，或低位上的数字出现跳动。
ｅ禁止在测量高电压（２２０Ｖ以上）或大电流（０．５Ａ以上）时换量程，以防止产生电弧，烧毁开关触点。
ｆ当显示、ＢＡＴＴ或ＬＯＷＢＡＴ时，表示电池电压低于工作电压。
TH1942 数字万用表用户手册说明书
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目录第一章概述 (1)1.1概述 (1)1.2使用条件 (2)1.2.1电源 (2)1.2.2环境温度与湿度 (2)1.3体积与重量 (2)1.4安全标记及注意事项 (2)1.5开箱检查 (3)1.6标志 (3)1.7保修 (3)第二章多用表简介 (4)2.1简介 (4)2.2前面板简述 (5)2.2.1屏幕指示信息 (6)2.2.2前面板菜单一览 (7)2.2.3前面板菜单参考 (7)2.2.4菜单操作说明 (8)2.3后面板介绍 (9)2.4开机准备及开机状态 (10)2.4.1连接电源 (10)2.4.2输入端介绍 (10)2.4.3开机程序 (11)2.4.4高压线路测量的安全注意事项 (11)2.4.5开机缺省状态 (12)2.4.6预热时间 (12)2.5显示屏 (12)第三章基本测量 (13)3.1开始 (13)3.2电压测量 (13)3.2.1连接方法 (13)3.3电流测量 (14)3.3.1连接方法 (14)3.3.2AMPS保险丝的更换 (16)3.4电阻测量 (16)3.4.1连接方法 (16)3.4.2屏蔽保护 (17)3.5频率和周期测量 (17)3.5.1测量误差 (17)3.5.2门限时间 (18)3.5.3连接方法 (18)3.6导通测量 (19)3.6.1连接方法 (19)3.7二极管测试 (20)3.7.1连接方法 (20)3.8交直流真有效值测量功能 (20)3.8.1连接测试方法 (20)3.8.2连接测试方法 (21)3.9选择第二显示 (21)3.9.1操作使用 (21)3.9.2操作使用 (22)3.10数学运算功能 (22)3.10.1Percent (22)3.10.2dB计算 (23)3.10.3dBm计算 (24)第四章测量选项 (26)4.1测量配置 (26)4.1.1量程 (26)4.1.2相对运算(Relative) (27)4.1.3速度（Rate） (27)4.2触发操作 (28)4.2.1触发流程 (28)4.3最大最小值（MAX/MIN） (30)4.4极限比较测量（Compare Operations） (30)4.4.1打开极限比较测量（Enabling compare） (30)4.4.2设置极限比较范围（Setting Compare Limit Values） (30)4.5系统应用（System Operations） (31)4.5.1蜂鸣器控制（Beep） (31)4.5.2按键音（Key Sound） (32)4.5.3自检（Self-test） (32)4.5.4校准（Calibration） (32)第五章远程操作 (33)5.1RS-232接口说明及操作 (33)5.1.1RS-232接口简介 (33)5.1.2RS-232操作 (34)5.2数据格式 (36)第六章SCPI命令参考 (37)6.1命令结构 (37)6.2命令语法 (37)6.2.1命令关键字和参数： (37)6.2.2命令关键字缩写规则 (39)6.2.3命令结构基本规则： (39)6.2.4多重命令规则 (40)6.2.5命令路径规则 (40)6.3命令参考 (41)6.3.1DISPlay子系统命令 (41)6.3.2FUNCtion子系统命令 (42)6.3.3VOLTage子系统命令 (43)6.3.4CURRent子系统命令 (46)6.3.5RESIister子系统命令 (49)6.3.6FREQuency和PERiod子系统命令 (51)6.3.7HOLD子系统命令 (53)6.3.8TRIGger子系统命令 (54)6.3.9FETCh子系统命令 (54)6.3.10共命令 (55)i.附录A (56)介绍 (56)技术说明 (56)ii.附录B (62)程序举例 (62)第一章概述感谢您购买和使用我公司产品。
数字万用表说明书.pdf_1700028980.7641792
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数字万用表的基础知识
数字万用表亦称数字多用表DMM（digital multimeter）
一、数字万用表的特点
1、数字万用表采用数字化测量技术，将被测电量均转换成电压信号，并以数
字形式显示。
2、准确度高
3、测量范围宽
4、测量速度快2～5次／秒
5、微功耗
6、集成度高，体积小，重量轻，可靠性好
7、测量种类多，功能齐全，操作简便
二．技术特性
1．测量范围
⑴交、直流电压（交流频率为45Hz～500Hz）；量程分别为200mV、2V、20V、200V和1000五档，直流精度为±（读数的％＋2个字）以下，交流精度为±（读数的1％＋5个字）；输入阻抗，直流档为10MΩ，交流档为10MΩ、100PF。
⑵交、直流电流量程分别为200μA、2mA、200mA和10A五档，直流精度为±（读数的％＋2个字），交流精度为±（读数的％＋5个字），最大电压负荷为250mV（交流有效值）。
⑶电阻：量程分别为：200Ω、2kΩ、200kΩ、2MΩ和20MΩ档。
精度为±（读数的％＋3个字）。
⑷二极管导通电压：量程为
0～，测试电流为1mA ±mA 。
⑸三极管β值检测：测试条件为：V CE ＝，I B ＝10μA 。
⑹短路检测：测试电路电阻＜
20Ω±10Ω
2．采样时间：T S ＝。
三．使用方法
1．准备
2．按下电源开关，观察液晶显示是否正常，有否电池缺电标志出现，若有则要先更换电池。
3．使用
（1）交、直流电流的测量：根据测量电流的大小选择适当的电流测量量程和红表笔的插入孔，测量直流时，红表笔接触电压高一端，黑表笔接触电压低的一端，正向电流从红表笔流入万用表，再从黑表笔流出，当要测量的电流大小不清楚的时候，先用最大的量程来测量，然后再逐渐减小量程来精确测量。
（2）交、直流电压的测量：红表笔插入“V/Ω”插孔中，根据电压的大小选择适当的电压测量量程，黑表笔接触电路“地”端，红表笔接触电路中待测点。
特别要注意，数字万用表测量交流电压的频率很低（45～500Hz ），中高频率信号的电压幅度应采用交流毫伏表来测量。
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