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Chapter II Introduction to Safety Regulations
1.1 The importance of testing
In today's high consumer awareness, every manufacturer of electrical and electronic products
must do its best to make the product safe. Each product must be designed to the best of its ability
to prevent the user from being exposed to electric shock. Even if the user makes an error, it
should not be shocked. In order to meet generally accepted safety requirements, safety testing
must be performed. At present, safety enforcement units, such as UL, CSA, IEC, BSI, VDE,
TUV, and JSI, require manufacturers to use "withstand voltage insulation testers" for safety
testing when designing and producing electronic or electrical products.
2.2 Withstand voltage test
If a product can work normally in a very harsh environment, it can be determined that it can also
work normally in a normal environment. The most common use cases for withstand voltage tests
are:
·
Functional testing at design time
—
determine the conditions under which the product designed
can meet its functional requirements.
·
Specification test during production
—
confirm that the produced product can meet the
requirements of its specifications.
·
Confirmation test during quality assurance
—
confirm that the quality of the product can meet
the safety standards.
·
Safety test after repair
—
confirm that the repaired product can maintain compliance with safety
standards.
Different products have different technical specifications. Basically, during the withstand voltage
test, a voltage higher than the normal working voltage is added to the product to test. This
voltage must last for a period of time. If a component stays within a specified range for a
specified period of time, it can be determined that the component works under normal conditions
and should be very safe. And good design and selection of good insulation materials can ensure
that users are protected from electric shock.
The withstand voltage test performed by this instrument is generally called "high-voltage
dielectric test", referred to as "withstand voltage test" for short. The basic requirement is 2
×
the working voltage of the object to be 1000V, as the test voltage standard. The test
voltage of some products may be higher than 2
×
working v 1000V. For example, the
operating voltage range of some products is from 100V to 240V, and the test voltage of such
products may be between 1000V and 4000V or higher. In general, products with a "double
insulation" design may use a test voltage that is higher than the 2
×
working v 1000V
standard.
The withstand voltage test is more precise in the product design and sample production than in
