Points to note when measuring new energy vehicle testing multimeters
(1) The new energy vehicle testing multimeter must have a large enough internal resistance, at least 10 times greater than the resistance of the circuit being measured, to avoid large measurement errors.
(2) Anti-slip measures should be taken for test leads or probes. Any instantaneous short circuit can easily damage the integrated circuit. The following method can be used to prevent the test lead from sliding: take a piece of bicycle valve core and put it on the test lead tip, and extend the test lead tip by about 0.5 mm. This can not only make the test lead tip well in contact with the point being tested, but also effectively prevent slipping. There will be no short circuit even if it hits adjacent points.
(3) When the measured voltage of a certain pin does not match the normal value, the quality of the integrated circuit can be judged by analyzing whether the pin voltage has any important impact on the normal operation of the integrated circuit and the corresponding changes in the voltages of other pins. .
(4) The integrated circuit pin voltage will be affected by peripheral components. When peripheral components leak, short circuit, open circuit or change value, or the peripheral circuit is connected to a potentiometer with variable resistance, the pin voltage will change due to different positions of the potentiometer's sliding arm.
(5) If the voltage of each pin of the integrated circuit is normal, the integrated circuit is generally considered normal; if the voltage of some pins of the integrated circuit is abnormal, you should start with the largest deviation from the normal value and check whether the peripheral components are faulty. If there is no fault, then The integrated circuit is probably damaged.
(6) For dynamic receiving devices, such as televisions, the voltages of each pin of the integrated circuit are different when there is a signal or not. If it is found that the pin voltage should not change but changes greatly, and it should change with the signal size and the position of the adjustable component but does not change, it can be determined that the integrated circuit is damaged.
(7) For devices with multiple working modes, the voltages of each pin of the integrated circuit are also different under different working modes.
