Resistor detection method

The TL13007S mainly uses the ohmmeter of a multimeter to detect ordinary resistors. By measuring the resistance value, it can determine whether there is a circuit breaker, short circuit, resistance change and other faults.

Generally, there are two methods to detect resistors in circuits: in-circuit detection and open-circuit detection.

On-road detection

This detection method does not require the removal of components, but uses a multimeter to directly detect the resistors on the circuit board. This detection method is relatively simple, but sometimes the measured value may be biased due to interference from other components in the circuit. Therefore, when using in-circuit detection, the interference of components in the circuit on the resistor must be considered.

The specific steps of on-road detection are as follows:

First disconnect the power supply to the circuit board.

Observe the resistor to see if it is damaged or cracked, whether it is burnt, the pin is broken, the copper foil wire of the pin is disconnected or has poor soldering, etc.

According to the nominal resistance of the resistor, adjust the range of the multimeter to the appropriate resistance range, and place the two test leads of the multimeter on the two pins of the resistor to be tested, and measure a resistance value.

Swap the two probes of the multimeter and measure the resistance.

Finally, compare the two measured resistance values ​​and take the larger one as the reference value (such as ). If , it is equal to or very close to the nominal resistance of the measured resistor, it can be concluded that the resistor is normal; if , it is greater than the nominal resistance of the measured resistor, it can be concluded that the resistor is damaged; if , it is much smaller than the nominal resistance (i.e., it has a certain resistance), it cannot be determined that the resistor is damaged at this time, and it may be due to other small resistances in parallel in the circuit. At this time, it is necessary to use the method of disconnecting the circuit board for further detection and confirmation.