(1) No-load characteristics
as for the power supply 220V/50Hz, 220V/60Hz, 240V/50 Hz, power 5 ~ 8W .
transformer primary load current ≤ 20mA; power supply 115/60Hz; power 5 ~ 8W of the transformer
primary No-load current ≤ 35 mA; no-load output voltage does not exceed rated voltage +10%.
(2) Load Characteristics
transformer at rated load conditions; the error of the secondary coil voltage should not be greater than
the requirements in Table 1;
4)、Output power
(1), measured current and voltage with the multimeter,and then according to P = UI, the output power
should not exceed transformer nominal requirements of ± 8%, If you exceed this requirement, you can
determine the transformer's power attenuation.
(2) According to P=U2/R,the output power shall not exceed the transformer nominal requirements of ±
8%, If you exceed this requirement, you can determine the transformer power attenuation.
5)、DCR
(1) turn-to-turn short circuit:
check by multimeter, select the appropriate range, measure the resistance of transformer winding,if the
deviation between real resistance with the standard resistance is great,that means the inter-turn short
circuit and outlet the open circuit.
(2) Coil Open circuit:
check by multimeter, select the appropriate range, measure the resistance.if the resistance is ∞, that
means transformer coil open circuit or open circuit.
6)、Insulation inspection
(1) insulating property between the shell and the iron core
Testing method:
check by multimeter, select the appropriate range, measure the resistance.if the resistance is ∞or tens
of thousands of ohms,means insulating property is good.if the measured resistance of the smaller or
0,means core screen has been destroyed.
(2) insulation between the windings
Testing method:
check by multimeter, select the appropriate range. one pen contacts with the transformer primary,the
other contacts with secondary output transformer.if the resistance is ∞ or tens of thousands of
ohms,means insulating property is good.if the measured resistance of the smaller or 0,means core
screen has been destroyed.
6、remote control
1), visual inspection
(1) injection parts should be no deformation, no mask loose, tilt phenomenon.
(2) The battery should be in a good elasticity with no rust.
(3) liquid crystal display without bubbles,display clear, correct, not more paragraphs, , ghosting and black.
2)、Function test
The battery into remote control, LCD display should clearly show the content (non-LCD display does not
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