安规系列测试仪基本知识 安规系列测试仪主要是用来检测电器产品是否漏电、是否接地良好、会不会伤害人身安全的专用测量 仪器，主要检测项目有耐电压、泄漏电流、绝缘电阻和接地电阻1、 耐电压检测：对被测电器的外壳或人体易触及的部位，与电源进线端子之间施加一个儿千伏高压 （交流或直流），检测在这种高电压下有多大的漏电流，漏电流超过一定值时就可能对人身构成伤害2、 泄漏电流检测：分为动态泄漏和静态泄漏1） 静态泄漏：在被测电器的外壳和人体易触及的部位，分别与电源火线、零线端子之间施加额定 工作电压的1.06倍电压，检测最大漏电流，此时被测电器不工作施加的1.06倍电压应通过隔离变 压器提供2） 动态泄漏：对被测电器供电运行的同时，进行与静态泄漏相同的检测（也称热态泄漏）3） 选择泄漏电流检测仪器时，应重点选择泄漏电流的输入阻抗和隔离变压器的容量测试仪的输 入阻抗要求模拟人体的阻抗网络，不同的电器产品标准有不同的人体网络模型，应正确选择，相应的 国家标准有 GB9706、GB3883、GB12113. GB8898. GB4943、GB4906、GB4706泄漏电流测试仪输岀隔 离变压器的容量应与被测电容容量和适合。
当被测电器是电机等，其启动电流比额定电流大儿倍时， 应按启动电流考虑3、 绝缘电阻检测：对被测电器的外壳或人体易触及的部位，与电源进线端子之间施加直流电压（一 般为1000V. 500V或250V）,检测在这种电压下的漏电流，折算成绝缘电阻4、 接地电阻测试：对被测电器外壳与接地端子之间施加恒定的大电流（一般为10A或25A）,检测 在这种电流下的导通电阻电阻过大起不到接地保护作用Electrical Safety Tests1. Dielectric Voltage Withstand TestA Dielectric Voltage Withstand Test or High Potential Test （HIPOT test） is a 100% produ ction line test to verify the quality and electrical safety characteristics of a produc ts. As required by national and international safety regulatory agencies such as JSI, C SA, VDE, BSI, UL, IEC, TUV etc. The test is performed by exposing the device under test （DUT）, input power mains to high voltage, the magnitude of which is specified by the a gency for each product type, for a given period of time. The assumption is that if the insulation can withstand the much higher voltage for a given period of time, it will be able to function adequately at its normal voltage level. If there is no Insulation bre akdown occurs, the DUT is deemed to have PASS the Dielectric Voltage Withstand Test. In sulation breakdown would have occurred when the current f1ow increases rapidly in an un controlled manner through the insulation. User must refer to the published standard for the product type, DUT, to apply the correct voltage. Typically, the applied voltage us ed is AC. If the DUT has large capacitor across the insulation, DC Voltage Withstand Te st is recommended. The DC voltage used is 1.414 times of? That in AC voltage.2. Insulation Resistance TestThe Insulation Resistance Test is very similar to DC Withstand Voltage Test. A DC volta ge, up to 1000 Volts is applied across two points of interest. Instead of the G0/N0 GO indication given in Voltage Withstand test, the IR test gives a resistance value usuall y in MQ. Typically, the test voltage used is 500V DC or 1000V DC and IR value measured is of no less than 10 MQ. The IR test is a qualitative test that gives an indication of the relative quality of the insulation system・ In some specifications, the IR test i s performed first then the Withstand Voltage test. If a DUT fails the IR test, it is li kely it will also fail the Withstand Voltage Test which is usually performed at a highe r voltage.3. Ground Bond TestGround Bond Test measures the impedance between the chassis and the ground post of the device under test (DUT). The Ground Bond test determines whether the safety circuit of the DUT can adequately handle fault current if the product should ever become defective.The Ground Bond Test is to apply a high DC or AC rms constant current, usually between 10 to 40 A, to determine the impedance between two points or the ground circuit. Gener ally the test current specified is 25A and the impedance measured is typically below 0. IQ. For CSA compliance, the test current required is 40A. The Ground Bond Test detects problems such as ground wire diameter too small, ground circuit open and ground screw is not tighten properly.4. Touch Current Test ( Previous Line Leakage Test)The Touch Current Test measure the amount of current flow between touchable metal parts and earth ground through the human body when the DUT is powered on. A Measuring Device, MD, circuit is used for human body impedance simulation. The voltage measured in the M D circuit is converted to the amount of leakage current flow through the MD circuit. Du e to the different assumptions used to represent human reaction, the MD circuit defers from one standard to another. The MD circuit is given in the safety standard document. The line voltage used for the test is normally set to worst case scenarios.。