On road resistance measurement method

Date:2024-11-15 Categories:Product knowledge Hits:185 From:Guangdong Youfeng Microelectronics Co., Ltd


The key points for using the road resistance measurement method are as follows:

① Before measurement, it is necessary to disconnect the power supply of the tested circuit to avoid damaging the components and instruments, and to avoid inaccurate measurement of resistance values.

② The R × 10k Ω range of the multimeter uses a 9V battery internally. Some integrated circuits have lower operating voltages, such as 3.3V and 5V. In order to prevent high voltage damage to the tested integrated circuit, it is best to choose the R × 100 Ω or R × 1k Ω range when measuring with the multimeter.

③ When measuring the resistance of each pin of an integrated circuit, one probe is grounded and the other probe is connected to each pin of the integrated circuit. The measured resistance value is the parallel value between the peripheral components (R1, C) of that pin and the internal circuit and related peripheral components of the integrated circuit. If there is a significant difference between the resistance of individual pins and the reference resistance, first check the peripheral components of that pin. If the peripheral components are normal, it is usually due to internal damage to the integrated circuit; If the resistance of most pins is abnormal, there is a high possibility of damage to the integrated circuit, but it cannot be completely ruled out that peripheral components of these pins are damaged.

 


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