YD2512直流低阻说明书

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长沙众泰汽车供应商自我认可试验大纲
注1：完成供应商认可试验大纲是签订试验计划的必要条件之一。

2：表格中供应商的测试仪器/设备一栏中所填写的内容须与《长沙众泰汽车供应商自我认可
试验能力报审表》对应,而且其功能/精度应满足标准的要求。

供应商自我试验室及仪器/设备经长沙众泰汽车产品认可部门确认后，其资源将列入长沙众泰
汽车可合作的试验室数据库中，供应商将承诺长沙众泰汽车有其资源共享的权利。

3：表格中测试方法一栏中所填写的内容应该是在满足标准条件下，结合供应商测试设备操
作程序的试验方法。

第 11 页，共 11 页。

使用说明书KD2531T2等电位连接电阻测量仪武汉市康达电气有限公司目录1 性能特点 (1)2 技术指标 (2)2.1 主要指标 (2)2.2 其它指标 (2)3 仪表外形 (3)4 使用方法 (4)4.1 电池 (4)4.1.1 电池配置 (4)4.1.2 电量检查 (4)4.2. 锂电池充电和拆装 (4)4.3 电阻测量 (5)5 注意事项 (6)6 附件 (6)7 常见现象及说明 (7)尊敬的用户：欢迎您使用KD2531T2等电位连接电阻测量仪。

为保障您的安全和仪表正常使用，请先仔细读完本说明书再进行操作。

本仪器安全性能符合国际标准IEC61010-1：2001。

本仪器执行标准Q/WKD07，符合GB/T 21431-2008 建筑物防雷装置检测技术规范1 性能特点●适于测量等电位连接电阻、各种电气设备间连接导体的电阻。

也可以测量开关、插座触点的接触电阻以及其它低值电阻。

●采用“四端子”测试技术，消除引线电阻引起的测量误差。

●采用数字微处理器，示值准确精度高，稳定可靠。

●3 1/2LCD大屏幕数字显示，并带有背光及读数锁定功能。

●有二种工作模式，短定时4秒钟和长定时5小时，当定时时间到后自动锁定读数、停止测试，并伴有声光提示。

●内置11.1V/1.8Ah锂电池供电，可连续工作约8小时。

●电池符号“”显示电量，并具备电池欠压报警功能。

●电流测试极开路时有开路指示符“OPEN”指示。

●操作简单，携带方便。

●具有防震、防尘、防潮结构，适应恶劣工作环境。

2 技术指标2.1 主要指标2.2 其它指标●绝缘电阻：500V ≥20MΩ●耐压：AC 1.5kV 50Hz 1min●工作温度和湿度：－10℃～+50℃≤85%RH●贮存温度和湿度：－15℃～+55℃≤90%RH●电源：8×1.5V(AA,LR6) 电池或11.1V/1.8Ah锂电池耗电：≤180mA●外形尺寸：255mm(L)×135mm(W)×80mm(D)●重量：≈0.8kg注:此说明书所述技术指标仅适于您现用的仪表，本公司保留对其变更的权力。

2512 0.027R 贴片电阻贴片电阻指的是电阻的一种生产与使用的方式，贴片电阻最开始是有插件色环电阻与玻璃釉电阻，金属膜电阻，炭膜电阻等以插件形式的为主，随着便携式产品不断发展，以及人们对电子产品的需求不断增加的情况下，是机械化生产的一次重大进步，除了贴片电阻以外，其他的元器件均转型成功，如贴片电容，贴片电感，贴片二三极管等等。

下面介绍下 2512 0.027R 贴片电阻有哪些特点与型号参数：2512 0.027R 贴片电阻在电路中主要起到采样电流的作用，因此也被称为采样电阻，因为单位为毫欧（mR），因此也被称为毫欧电阻。

2512 0.027R 贴片电阻，下面列举下参数与材质：2512 0.027R 3W 1% 50ppm/℃，铁铬铝合金，康铜合金，镍铬合金，镍铜合金等。

2512 0.027R 2W 1% 50ppm/℃，陶瓷合金，铁铬铝合金，康铜合金，镍铬合金，镍铜合金等。

1225 0.027R 3W 1% 50ppm/℃，锰铜陶瓷合金（1225 长电极合金电阻）2512 0.027R 2W 1% 75ppm/℃，金属膜贴片电阻2512 0.027R 2W 1% 600ppm/℃，厚膜升功率贴片电阻2512 0.027R 1W 1% 600ppm/℃，厚膜贴片电阻因为2512 0.027R 贴片电阻基本上都是应用在采样电路，因此对电阻的精度与可靠性要求极高，所以大部分均为1%或者更高精度，但是有部分产品对采样电阻的宽度较大和节约成本，因此有会有很多选择5%精度的。

5%精度的基本上都是属于厚膜普通贴片电阻，参数如下：2512 0.027R 2W 5% 600ppm/℃，厚膜升功率贴片电阻2512 0.027R 1W 5% 600ppm/℃，厚膜贴片电阻。

MODEL2512B系列智能直流低电阻测度仪操作使用手册常州市金艾联电子科技有限公司TEL：*************89187775概述JK2512B智能直流低电阻测试仪的外观流畅简洁，操作简便直观。

以新颖的设计思路，让各类触及者拥有全新的感觉。

特点介绍1直观的显示使用液晶显示，使得各项参数的显示都有明确的提示，也不管白天黑夜，都有清晰的字符让您一目了然，更没有让人眼花缭乱的各种指示灯让您难以记忆。

2少量的按键本仪器仅有四个操作按键，让您无须记忆更多条条款款，设置更多的功能数据。

3多参数显示当您读出了电阻值将其换算成百分比误差而感到麻烦，当您读出了百分比误差而将仪器显示改为显示电阻时感到重复工作时，您不妨选择本仪器的分选功能吧。

本仪器在分选测量时既显示电阻值，又显示百分比误差；在直读测量时既显示电阻值，又显示测量量程和读数范围，方便了您的阅读。

并且在设置时显示文字告知您正在做什么。

4等级品讯示在生产线上您也许要将电阻分成三个精度级别，本仪器完全可以满足您的要求。

本仪器可以按百分比的形式设置为三个等级品。

有合格闪光提示和合格的级别显示，也有合格讯响，但您可以关掉讯响而仅有合格灯指示和级别显示。

5通信接口如果您需要自动化测量，您可以利用通信接口达到这一目的。

本仪器的接口设计充分考虑了用户的方便性，您只要根据说明书对您的“编程器”或“计算机”简单编程，也可以用简单的硬件电路就可轻松完成。

6方便的校准如果为了校准要打开仪器机箱是一件多么麻烦的事情，如果为了校准要调节电位器是一件多么古老的方法。

本仪器的一种新的校准方法——人机对话的标准方式，只要按按键盘即可完成校准。

手册目录章节目录次目录页次第一章测试中注意事项4第二章安全规定4第三章安装要点5第四章技术规范6第五章面板和背板7面板图7面板说明7背板说明8第六章中英文词语对照表9第七章测试参数设定程序10第八章操作程序及步骤13第九章校准程序和步骤15JK2512B型智能直流低电阻测试仪使用说明书第一章：测试中的注意事项1开机预热仪器开机测试前必须预热15分钟，以等待仪器内部线路电参数稳定后再测量。

目录一、概述 (2)二、性能特点 (2)三、面板功能说明 (4)四、后面板功能说明 (6)五、操作步骤说明 (7)六、成套与保修 (9)一、概述2511A型智能直流多电阻测试仪能对变压器、电机、开关、继电器、接插件等各类电阻进行测试，仪器测量范围1uΩ~2M Ω，仪器产生高精度恒流经被测件进行四端点测量，有效地扣除了引线误差，适合用户作高精度测量；由于使用直流测试及最多可以进行10组负载的快速扫描测试，对各类变压器及电感的铜阻测量尤为适合；本仪器扩展了同类仪器的功能，用户可直接设置两组标称值，即电阻直读显示上/下限值，百分比标称值和+/-百分比误差值，且所有设置判断针对于全量程，百分比误差最大可显示9999%，最小显示0.000%，极大地提高了仪器使用范围；此外，测试速度（快速、慢速）的改变，全状态、全设置数值的断电保护等功能也极大的方便了用户对产品的测试。

二、性能特点1、显示：7段LED显示窗，以五位数字显示阻值、百分比值和简单的操作提示。

2、测量范围；1uΩ～1.9999MΩ（分九个测试档）⑴超量程显示：└┘└┘└┘└┘└┘⑵ %显示上超：└┘└┘└┘└┘└┘下超：─┌┐┌┐┌┐┌┐┌┐3、测试速度：慢速（4次/秒）、快速（8次/秒）4、档位选择：自动或锁定5、电源：AC 50Hz 220V±5%6、操作环境温度：18～28℃， RH≤80%7、联机模式：HANDER界面8、外形：300mm×110mm×280mm9、分选：分选输出LOW（下超）、PASS（合格）、HIGH（上超），上、下超报警功能。

YD2511A型直流低电阻测试仪三、面板功能说明（一）图3-1是仪器面板示意图。

图3-1：2511A前面板布局图（二）面板功能说明1、电源开关：开关的状态见按键的标志。

2、测试线插座：用于连接四端测试线。

3、测试指示灯：该指示灯闪动一次，表示仪器作一次测量。

4、电阻单位：分为mΩ、Ω、KΩ、MΩ，和3配合作全量程显示。

2512轨道巷探放水设计编制日期：2014年8月22日目录第一章地质概况 (3)一、工作面的概况 (3)二、水文地质情况 (3)第二章探放水设计 (4)一、探水目的 (4)二、探水设备 (5)三、探水前的准备工作 (5)四、2512探放水设计 (5)五、通风要求 (6)六、压风自救、供水施救 (8)七、供电系统 (8)八、排水系统 (8)九、通讯系统 (9)十、灾害预防及避灾路线 (9)根据《煤矿防治水规定》要求,依据“预测预报、有掘必探、先探后掘、先治后采”的原则。

执行“物探先行、化探跟进、钻探验证”综合探测手段。

结合我矿实际情况，为保证我矿探放水工作安全有序、有效的进行，特制定以下内容：第一章地质概况一、2512轨道巷基本概况2512轨道巷，开门位置在二采西翼集中轨道巷， 2512轨道巷巷道设计长度630米（含二采西翼轨道巷和二采西翼集中回风巷的联络巷），巷道方位为318°33′。

二、水文地质情况根据《山西东江煤业地质报告》、《山西东江煤业矿井水文地质类型划分报告》、《山西东江煤业地面物探报告》分析。

1、工作面含水层主要有奥陶系中统石灰岩、石炭系上统太原组石灰岩、二叠系下统山西组砂岩、二叠系石盒子组砂岩、第四系全新统砂砾层含水层。

工作面内本溪组厚度29m左右，岩性主要由泥岩、砂质泥岩和铝土泥岩组成，质地细腻，致密，具有良好的隔水性能，为主要隔水层。

此外，相间于石炭系太原组各灰岩含水层和二叠系各砂岩含水层间的泥岩、砂质泥岩，由于其岩性致密，亦可起到层间隔水作用，但当其位于浅部层段时，因受风化作用影响，隔水性能受到不同程度破坏。

2、工作面范围各含水层受补给条件影响，除奥灰含水层和太原组灰岩含水层局部富水性较强外，大都属弱含水层。

3、2512工作面煤层的直接充水含水层为煤层之上山西组砂岩含水层和煤层下伏的太原组灰岩含水层，因为这些含水层的水可以通过冒裂带和底鼓等途径直接进入矿井。

由于太原组以上各含水层大都含水性较弱，—般不会对煤层开采造成威胁。

Table of ContentsCHAPTER1: Overview1. Introduction (2)2. Technical Index (2)3. Operating Environment (3)CHAPTER 2: Instrument Structure1. Front Panel Instruction (3)2. Rear Panel Instruction (4)CHAPTER3: Operation Instruction1. Conventional Test (5)2. Parameter Setup (6)1 R Value Direct-Read Mode Setup (6)2 △％Read Mode Setup (6)3 Sorting Setup (7)4 Clear Setup (7)5 Alarm Setup (7)6 Speed Setup (7)7 External Trigger Setup (7)8 Serial Communication Setup (7)3. Example (8)Chapter4: Packing and Warranty1. Packing (10)2. Warranty (10)Chapter 1: Overview1. Product IntroductionYD2512 DC is intelligent DC Low-ohm meter with wide measurement range and high-accuracy. It can be used to measure resistance of transformer, electric engine, switch, relay, connector contact, etc.The measurement range is 1u Ω－1.9999M Ω.The high-accuracy constant current thatinstrument produces through DUT (under test device) will carry on four terminal measurement, which removes leader error effectively and suits user to make the high-accuracy measurement; It is especially suitable to all kinds of tra nsformer and inductance‟s copper measurement; The resistance reading straightly displays High/low-limit and +/- percentage error value, and all setup judgment is for entire range. The percentage error may maximum display ±99.99%, minimum ±0.000%, which enhances instrument‟s application range. Besides, test speed (Fast, Slow) changing, total state and total setup value power-off protection ,etc all make it easier for user to test the product..2. Technical Index1,Display Mode: High-brightness display （VFD ）2, Test speed: Slow: 5 Fast: 10 (times/second)3,Read Mode: R value direct-read and △％ read4, Measurement Range and each range's Basic Accuracy RangeMeasurement Range Resolution Current Accuracy 20m Ω1u Ω～19.999m Ω 1u Ω 1A ±0.1%+3digits 200m Ω10u Ω～199.99m Ω 10u Ω 100mA ±0.05%+3 digits2Ω100u Ω～1.9999Ω 100u Ω ±0.03%+2 digits 20Ω1m Ω～19.999Ω 1m Ω 10mA 200Ω10m Ω～199.99Ω 10m Ω 1mA 2K Ω100m Ω～1.9999K Ω 100m Ω 100uA 20K Ω1Ω～19.999K Ω 1Ω 10uA 200k Ω10Ω～199.99K Ω 10Ω ±0.05%+3 digits 2M Ω 100Ω～1.9999M Ω 100Ω 1uA ±0.1%+3 digits 5, Range Selection: Auto or Lock6, Trigger Mode: Internal and External trigger Test7,Sorting Signal: Pass, High, Low（online-test）Pass, Fail（Single-test）7, Exterior Size and Weight:Dimension: 290mmX110mmX350mmWeight: Approx.5kg3. Operating Environment:1,Power Supply: AC 50Hz 220V±5%2,Temperature:18～28℃, RH≤80%To guarantee measurement accuracy or not to damage instrument, pay attention to the following items:1. Please do not put the instrument in the environment of multi-dusts, multi-vibrations, straightsunshine or corrosion gas condition when use.2. Although the instrument has dealt with AC current noise, it's better place and use it in lowernoise environment. If can not avoid, please add power filter for instrument.The instrument should be operated in temperature form 0℃~30℃.Package the instrument well if not use for long time.Chapter 2: Panel1. Front Panel Schematic and Function Specification:Display Screen Graph:Graph 2-1Key Area Graph:Graph 2-2Graph 2-3Function Description:1、Test Line Socket（Graph 2-3）:Connect four terminal test lines.2、Power Switch: Switch condition depends on makings in the key.3、Display Screen Graph（Graph2-1）:Display company brand, test data or unit, setup data or unit,sorting results, setup interface etc.4、Key Area（Graph2-2）:（1）Number key: Input setup value directly, range value, code etc.（2）Function Key:Sorting Key: Turn on（COMP lights）or Turn off（COMP disappears）Speed Key: Select slow（Display ‘S’）test or Fast（Display‘F’）TestAlarm Key: Select Pass, Fail Alarm/Alarm turn offLock Key: Test Unit lock or Auto（‘AUTO’Highlights）Display Key: Select R（Display‘R’）or△％（Display‘△％’）Zeroing Key:If necessary, clear test base number to enhance test accuracySetup Key: Enter setup interface or calibration keyEnter Key: Input data to confirmR232 Key: Turn on or off Serial communicationTrigger Key: Select external trigger（EX TRIG Highlights）or internaltriggerNote: Details on Display Graph please contrast Display Screen Indicator2. Rear Panel:Function Description:1, Power Socket: 220V 50Hz 1A2, Handler: PLC Interface3, RS-232C: Serial Interface4, Grounding Protection TerminalChapter3: Operation Instruction1. Conventional TestAfter preheating 20 minutes, connect test jig. Press “Clear "key to make test jig short circuit. To carry on Low-ohm high-accuracy test, do as Graph3—1 to short circuit.图3—1 High-Accuracy Short-circuitTest jig must be in the same side, short circuit bar uses 10 X 5 X 3 red copper or other fine electric conduction material, and the jig should be as near as possible. The jig should not be turned arbitrarily in regular measurement.When doing single-piece measurement, after the instrument tripped stop automatically, then read data after choosing the right range. When measuring with a breed and the first product, press “Display”key to lock in the suitable range after data is stable. It can improve measurement speed.2. Parameter Setup1, R Value Direct-Read Mode Setup1.1 Press“Display” key to select R value in measurement state. Display screen displays ‘R’,High,low-limit resistance setup value and sorting ‟s range setting value.1.2 Press “Setup” key to enter setup state. Display screen displays ‚-Pro-‛.1.3 Press “Setup” key to enter sorting range setup state. When‘RANGE’flashes, now throughNumber key, select test range in need.1～9 respectively represents20mΩ,200mΩ,2Ω,20Ω,200Ω,2KΩ,20KΩ,200KΩ,2MΩmeasurement range. After selecting range, high, low-limit decimal and unit will be fixed, which can not modify in high, low-limit setup.1.4 P ress “Setup” key to enter resistance high-limit setup state. On display screen ‘HIGH’highlights, ‘LOW’disappears, and value after‘HIGH’begins to flash, which shows setup of high-limit nominal value. Display‚×××××‛the first value in the left flashes .Note: X Represents Any Value1.5 Press‘Enter’key to select flash range, then input setup data through Number key. Keeppressing‘Enter’key can make flash range cycle. If do not need modify data, enter next step directly.1.6 Press “Setup” key to enter resistance low-limit setup state. On display screen ‘LOW’highlights, ‘HIGH’disappears, and the value after‘LOW’begins to flash, which shows setup of low-limit nominal value begins. Display‚×××××‛the first value in the left flashes .Note: X Represents Any Value.1.7 Operate as 1.5.1.8 Press “Setup” key to enter complete state. Display screen displays ‘End’.1.9 Press “Setup” key to enter exit setup state, and enter R value test state.2 △％Read Mode Setup2.1 Press“Display” key to select △% in measurement state. Display screen displays ‘△%’,High,low-limit resistance setup value and sorting ‟s range setting value.2.2 Press “Setup” key to enter setup state. Display screen displays ‚-Pro-‛.2.3 Press “Setup” key to enter sorting range setup state. When‘RANGE’flashes, now throughNumber key, select test range in need.1～9 respectively represents20mΩ,200mΩ,2Ω,20Ω,200Ω,2KΩ,20KΩ,200KΩ,2MΩmeasurement range. After selecting range, high, low-limit decimal and unit will be fixed, which can not modify in high, low-limit setup.2.4 P ress “Setup” key to enter△%high-limit setup state. On display screen ‘HIGH’highlights,‘LOW’disappears, and the value after‘HIGH’begins to flash, which shows setup of high-limit nominal value begins. Display‚×××××‛the first value in the left flashes .Note: X Represents Any Value.2.5 Press‘Enter’key to select flash range, then input setup data through Number key. Keeppressing‘Enter’key can make flash range cycle. If do not need modify data, enter next step directly.2.6 Press “Setup” key to enter △% low-limit setup state. On display screen ‘LOW’highlights,‘HIGH’disappears, and the value after‘LOW’begins to flash, which shows setup of low-limit nominal value begins. Display‚×××××‛the first value in the left flashes .Note: X Represents Any Value.2.7 Operate as 2.5.2.8 Press “Setup” key to enter complete state. Display Screen displays ‘End’.2.9 Press “Setup” key to enter back setup state, and enter R value test state.3, Sorting SetupPress “Sorting” key, select whether sorting is open. Open state, On display screen ‘COMP’highlights., instrument enters sorting state. In test state,‚HI‛,‚GD‛, ‚LO‛respectively indicates the sorting results.4, Clear setupMake test jig short circuit correctly（3-1 Graph Indicates）.Press …Zero‟ key, when clearing state is open, display screen display‘CLR’.5, Alarm SetupT urn off sorting, press‘Alarm’key directly, There are three state in the display screen indicates:‘（（.））’Sign and‘GD’displays which represents Pass Alarm,‘（（.））’sign and ‘NG’displays which represents Fail Alarm,‘（（.））’sign,‘GD’and‘NG’no display which represents Alarm off.6, Speed SetupIn test state, press‘Speed’key, select Fast （Display‘F’）and Slow（Display‘S’）test. 7, External Trigger SetupIn test state, press‘Trigger’key, select trigger signal source, display screen displays‘EX TRIG’which selects external trigger signal, No display selects internal trigger signal.8, Serial Communication SetupIn test state, press‘R232’key, displays ‘’sign which selects serial communication.Execution work operating as PC signal, no display means no serial communication.3. ExampleTake input 10.000Ω±10% for example, in sorting state, use operation steps of R and△% respectively.1, R Value Direct-Read Mode1.1 Setup high, low-Limit nominal value in R mode10.000Ω×(1+10%)=11.000Ω；10.000Ω×(1-10%)=9.000Ω1.1.1 Press “Setup” key. Display Screen displays ‚-Pro-‛.1.1.2 Press “Setup” key, display screen will display present setting High, low-limit resistance valuemeanwhile‘RANGE’flashes. Now through Number key, select test range in need. That is number‘4’.1.1.3 P ress “Setup” key .On display screen ‘HIGH’highlights, ‘LOW’disappears, and the valueafter‘HIGH’begins to flash, which shows setup of high-limit nominal value begins. Display ‚×××××Ω‛the first value in the left flashes .Note: X Represents Any Value.1.1.4 Press number‘1’directly in numerical keyboard to input number‘1’to make displaywindow display 1×.×××Ω.1.1.5 Press‘Enter’key to make the second range flash from the left.1.1.6 Press number‘1’in numerical keyboard to make display window display 11.×××Ω.1.1.7 Repeat 1.14～1.16 steps to make display window display 11.000.1.1.8 Keep pressing‘Enter’key can make flash value range cycle.1.1.9 Press “Setup” key. On display screen ‘LOW’highlights, ‘HIGH’disappears, and the valueafter‘LOW’begins to flash, which shows setup of low-limit nominal value begins.1.1.10 Repeat 1.1.4～1.1.8 steps to set display window to 09.000 Ω.1.1.12 Press ‘Setup’key. Display screen displays ‚-End-‛. Press（Setup）key again to end setupstate and back to normal measurement state.1.2 SortingPress “Sorting” key to make display screen‟s‘COMP’highlights.2, 2 △％Read Mode2.1 Setup percentage nominal value and high, low-limit percentage error value in △% mode2.1.1 Press “Setup” key. Display Screen displays ‚-Pro-‛.2.1.2 Press “Setup” key, display screen will display present setting high, low-limit resistance valuemeanwhile‘RANGE’flashes. Now through Number key, select test range in need. That is number‘4’.2.1.3 Press Number key in keyboard to select suitable range. Operation steps are the same as Rmode Setup.2.1.4 Press “Setup” key. Display screen displays ‚×××××‛,the first range in the left flashes.According to Range, use number key in keyboard to input resistance. Input way is the same as1.14～1.16.In this example, input ‘10000’.2.1.5 Press (Setup) key. Display screen displays ‚HIGH‛and the first range after value ‘XX.XX’flashes. Now it begins percentage error high -limit setup.2.1.6 Operate as 1.14～1.16and set present value to ‚10.00‛2.1.7 Display screen displays ‚LOW‛,the first range after value ‘XX.XX’flashes. Now itbegins percentage error low -limit setup.2.1.8 Operate as 1.14～1.16and set present value to ‚10.00‛2.1.9 Press ‘Setup’key to finish percentage low limit setup. Display screen displays ‚-End-‛.Press（Setup）key again to end setup state and back to normal measurement state. Note: ①Please turn off power source immediately when the instrument displays chaos or not being able to test normally .Keep pressing any key to turn on power and instrument carries on internal parameter initialization setup automatically. Now high-limit value in R mode is1.000kΩ,low-limit value is 0.5000 kΩ.△%mode nominal value is 1.0000kΩ,percentagehigh-limit is10.00%,percentage low-limit 10.00%.②As instrument has data protection function , setup value in R and △% mode will bepreserved respectively in the storage, unless revised by (Setup) key.③Under △% mode, when percentage nominal value is set to 00000,display windowdisplays‚Error‛or abnormal characters,‚HI‛‚GD‛‚LO‛Indicator lamp ineffective, usermust setup percentage nominal value to nonzero value, then instrument can test normally.④The instrument zerocleareffective to entire range.Special Cautions！Under any display mode,enter setup state, when display window displays "Pro-”, user is not allowed to press “speed”key. If press "speed" key display window will display "ID-PW" .This is the instrument’s standard resistance percentage calibration function. To setup this parameter will directly influence the test results, user should not enter to this function . Please keep pressing <Setup>key to make instrument exit if user enter to this function.Chapter4：Packing and Warranty1. Packing:The standard accessories should include the following items :1. YD2512 DC Low-ohm Meter1set2. Power cable x 1pcs3. Test Line 1pair4. Service Manual1set5. Warranty Card1set6. Certification1pcs7. Test Report1setCheck the contents when you received the instrument, opens the box .If the contents are incomplete; please contact our company or business department immediately.2. Warranty:The period of warranty:Users are those who purchases instrument from our company and business department; Date starts from delivery date from our company and business department.The period of warranty is two years.The Warranty Card is needed when the instrument needs to be repaired. In warranty period, instrument damage caused by user‟s improper operation, maintenance cost should be undertaken by the users.Chanzhou Yangzi Electronic Co., Ltd. Note: If you have any questions about the usage of instrument, welcome consultation by phone.。