The CBTL Southern LCS testing lab has observed that we have achieved excellent results in the proficiency testing No. "23e37-1 Working Voltage" provided by the organizer IFM. This time, the pass rate of the proficiency testing program is 52.1%

The proficiency testing activity serves as a crucial technical tool for laboratory accreditation bodies and management departments to assess the competence of laboratories, while also functioning as an essential external quality assurance mechanism. By actively participating in regular proficiency testing activities, we have successfully validated the accuracy and scientific validity of our laboratory's test results, thereby enhancing our confidence in delivering reliable data and test reports to our clients.

Technical lecture hall

In the safety testing standards for electronic and electrical products, when testing safety items such as creepage distances, electrical clearances or dielectric strength of their components and related insulation, it is necessary to determine the safety of the relevant components based on the working voltage of these tested parts. Applied value of electrical strength test voltage, limits of creepage distance and clearance.

For example, in IEC60598-1, there are detailed requirements for the limits of creepage distances and clearances, and the safety limits are found according to the working voltage of the component under test.

Therefore, working voltage testing is a basic test item for electronic and electrical product testing, which directly affects whether product development and design meets national standards. It is also crucial for laboratory testing and determination.

Notes on testing:

In actual testing, no matter which two parts are tested, a common reference point for the two parts should be established. If the two parts that need to be measured are not at ground potential, then they have no common reference point. This kind of measurement is called differential measurement or floating measurement. If tested directly, the results will "float" due to floating ground, so a public reference point needs to be established. There are two methods for establishing a public reference point:

(1) Ground is a commonly used public reference point, so any point on the floating ground can be grounded.

(2) Connecting any point between the output circuit and the input circuit is equivalent to establishing a common reference point for the two isolation circuits.

When determining the working voltage, attention should be paid to: (1) Since the power board needs to be removed from the whole machine when measuring the working voltage, the original grounding is often disconnected or partially disconnected, so all grounding connections must be restored; ( 2) When measuring the working voltage of components such as power transformers, isolation transformers or isolation relays, all points must be arranged and combined to obtain the maximum value; (3) The frequency of the complete waveform of the working voltage displayed on the oscilloscope should be consistent with the test The sample power supply frequency is the same or a high-frequency signal superimposed on the power supply frequency; (4) The outer skin of the oscilloscope probe is grounded, so it is best to place the outer skin of the probe on the secondary side of the power supply, and the center of the probe is connected to the primary side of the power supply; in addition , It should also be noted that when the measured value of the working voltage is less than the rated voltage of the sample being tested or the upper limit of the rated voltage range, the working voltage should be determined according to the rated voltage or the upper limit of the rated voltage range.

Technical lecture hall

In the safety testing standards for electronic and electrical products, when testing safety items such as creepage distances, electrical clearances or dielectric strength of their components and related insulation, it is necessary to determine the safety of the relevant components based on the working voltage of these tested parts. Applied value of electrical strength test voltage, limits of creepage distance and clearance.

For example, in IEC60598-1, there are detailed requirements for the limits of creepage distances and clearances, and the safety limits are found according to the working voltage of the component under test.

Therefore, working voltage testing is a basic test item for electronic and electrical product testing, which directly affects whether product development and design meets national standards. It is also crucial for laboratory testing and determination.

Notes on testing:

In actual testing, no matter which two parts are tested, a common reference point for the two parts should be established. If the two parts that need to be measured are not at ground potential, then they have no common reference point. This kind of measurement is called differential measurement or floating measurement. If tested directly, the results will "float" due to floating ground, so a public reference point needs to be established. There are two methods for establishing a public reference point:

(1) Ground is a commonly used public reference point, so any point on the floating ground can be grounded.

(2) Connecting any point between the output circuit and the input circuit is equivalent to establishing a common reference point for the two isolation circuits.

When determining the working voltage, attention should be paid to: (1) Since the power board needs to be removed from the whole machine when measuring the working voltage, the original grounding is often disconnected or partially disconnected, so all grounding connections must be restored; ( 2) When measuring the working voltage of components such as power transformers, isolation transformers or isolation relays, all points must be arranged and combined to obtain the maximum value; (3) The frequency of the complete waveform of the working voltage displayed on the oscilloscope should be consistent with the test The sample power supply frequency is the same or a high-frequency signal superimposed on the power supply frequency; (4) The outer skin of the oscilloscope probe is grounded, so it is best to place the outer skin of the probe on the secondary side of the power supply, and the center of the probe is connected to the primary side of the power supply; in addition , It should also be noted that when the measured value of the working voltage is less than the rated voltage of the sample being tested or the upper limit of the rated voltage range, the working voltage should be determined according to the rated voltage or the upper limit of the rated voltage range.