11
The withstand voltage test is more precise in product design and sample production than in production.
The trial phase has already determined the safety of the product. Although only a few samples are used
to judge the product design,
Online testing should also strictly require that all products must pass safety standards to confirm that no
defective products will flow out of the production line.
The output voltage of the withstand voltage tester must be maintained in the range of 100% to 120% of
the specified voltage. AC withstand voltage test
The output frequency of the meter must be maintained between 40 and 70Hz, and its peak value must
not be lower than the root mean square (RMS) voltage value.
1.3 times and its peak value must not be higher than 1.5 times the root mean square (RMS) voltage
value.
2.3 Advantages and disadvantages of DC testing
Please confirm with the manufacturers designated by the product under test what voltage the product
should use. Some products accept both DC and AC test options, but there are still many products that
only accept either DC or AC tests. If safety regulations allow simultaneous DC and AC testing,
manufacturers can decide for themselves which test is more suitable for their products. To achieve this,
users must understand the advantages and disadvantages of DC and AC testing.
2.3.1 Characteristics and advantages and disadvantages of AC
withstand voltage (ACW) test
Features:
Most of the DUTs that do withstand voltage tests will contain some stray capacitor. AC testing may not be
fully charged these stray capacitors, so a continuous current will flow through them.
Advantages:
1. Generally speaking, AC testing is easier to be accepted by manufacturers than DC testing. Because
most products use AC power and the AC testing can test the positive and negative polarity of the
product at the same time. And the testing is consistent with products actual use conditions.
2. Because AC testing can not fully charged the stray capacitors and there is no instant surge current,
the full voltage can be added at the beginning of the test instead of increasing the voltage slowly,
unless the product is very sensitive to an Impulse voltage.
3.Because AC testing cannot fully charged those stray capacitors, it is not necessary to discharge
DUTs after the test.
Disadvantages:
1. The main disadvantage is that if the stray capacitance of the DUT is large or the DUT is a capacitive
load, in the case, the generated current will be much larger than the actual leakage current, hence the
actual leakage current cannot be known.
2. Another disadvantage, due to the current supplied to the stray capacitance of the DUT, the current
required by the instrument will be much higher than when using a DC testing method. This will
increase the danger to the operator.