Practical application of safety comprehensive tester

<><1. The hazards in the safety standards include the following four types: electrical damage, mechanical and physical damage, low-voltage and high-energy injury, and flammable prevention and control, which are the most basic safety standards in various product safety regulations, among which for general electronic products, electrical damage is the most damaging to users.

2. The test of electrical damage is mainly divided into the following four types:

Dielectricwithstand Hipot Test: The hipot test applies a high voltage to the power supply and ground circuit of the product and measures its collapse state.

Insulation resistance test: Measure the electrical insulation status of the product.

LeakageCurrent Test: Checks whether the leakage current from the AC DC power supply to ground exceeds the standard.

Protective ground: Detect whether the accessible metal mechanism and other parts are indeed grounded.

3. German GMC-I's comprehensive electrical safety tester.

The Secutest series meets the requirements of various standards for electrical safety test items, is compact and portable, and supports cloud software operation.

1. Safety comprehensive tester series, program-controlled safety tester series, medical safety tester series, ultra-high pressure withstand voltage tester series.

2. Meet IEC60335, UL60335, and other domestic and foreign safety standard tests, and meet the requirements of JJG795-2004 and JJG69-2003 safety metrology verification procedures.

3. It is used for the test of the withstand voltage of medical electrical equipment.

4. This series of instruments conforms to the 1988 standard.

5. The safety comprehensive tester is a general-purpose instrument, which is suitable for the detection of the whole machine and material devices.

The safety tester is used for the withstand voltage measurement test of high-voltage components and devices (with AC and DC withstand voltage meters), such as silicon stacks, etc. It is mainly used to detect whether the product is leakage, whether the grounding is good, and whether it will harm personal safety.

SELV circuits.

The selv circuit is a safe voltage circuit, which is safe for everyone, such as the DC output of the mobile phone charger, to the mobile phone, they are safe, and there will be no danger if you touch it at will.

Note: SELV circuits have different interpretations in different standards, for example, the interpretation in IEC60364 is different from IEC60950-1, so it is necessary to pay attention to which standard is under SELV, and its hazards are also different.

The SELV circuit needs to meet special requirements in order to be a SELV circuit, and these requirements are, in the case of a single fault, still meet the requirements of the SELV circuit. Therefore, each SELV circuit needs to be tested under a single fault to prove that the SELV circuit is stable. During the test, a single fault is introduced one by one and the SELV circuit is monitored.

temperature of internal and external surfaces under normal operation).

In the safety test, the temperature rise test is the most important, although the equipment and instruments used in the test are the same as the artificial climate environment test, but the test items and test devices and purposes are very different. The artificial climate environment mainly examines the adaptability of the equipment, the disturbance of the mountain and the reliability. Safety regulations examine whether the equipment can work safely.

Here is an example to illustrate the difference: the safety test mainly tests the temperature of the safety device, such as the working temperature of the insulating material under normal conditions, which is less than the maximum allowable temperature of the insulating material at the highest allowable operating temperature of the equipment. For example, in the environment of 25 test insulation material temperature is 100, and the insulation material can only operate safely below 130, which is the key to define the maximum allowable working temperature of the equipment, if the equipment is 50 ambient temperature, then the temperature of the insulation material converted to 50 ambient temperature test temperature should be 125, to meet the requirements of less than 130, the test passed.

If the equipment is 60 ambient temperature, then the ambient temperature test temperature converted to 60 should be 135, greater than 130 requirements, and the test fails. Similarly, other safety devices need to be tested for operating temperature. Li Kong judged whether the requirements were met.

As an insulating material or plastic part with dangerous voltage, it is necessary to do a ball pressure test to ensure that the plastic parts have sufficient support strength when the dangerous voltage parts are working at high temperatures. The test temperature is the maximum plus 15, but not less than 125. The ball pressure time is maintained at the required temperature for 1h.

I'll talk about this one in general, because you're too broad-faced.

These are safety testers, for different test items, the quoted standards are national standards or foreign standards, such as GB4943, these are mandatory standards, enterprises must meet, for enterprises, these equipment is a hard demand.

The factors that are generally considered for business purchases are as follows:

1. Applicability: The measurement parameters and accuracy of your machine should meet the needs of the enterprise.

Regarding applicability, I will say a little more, for example, if your company makes small household appliances and wants to buy safety testers, the company has enterprise standards, and the enterprise standards are higher than the national standard. Incoming detection amount motor, the standard is 1200V 60S 5MA, the rapid inspection standard is 1850V 1S 5MA, then your equipment must be able to reliably measure this parameter, the machine parameters are subject to the enterprise standard, and the national standard is generally subject to the national standard.