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Electronic Components To Ensure Accurate Measurement
Jul 11, 2017

The detection of Electronic Components is a basic work of appliance repair, how to accurately and effectively detect the relevant parameters of Electronic Components to determine whether the normal Electronic Components, not a monotony of things, must be based on different Electronic Components using different methods to determine Whether the Electronic Components are normal or not. Especially for beginners, the mastery of commonly used Electronic Components of the detection methods and experience is necessary, the following commonly used electronic Electronic Components testing experience and methods for the test for the test.

First, the resistance of the detection methods and experience:

1, fixed resistor detection.

A, the two test leads (regardless of positive and negative), respectively, and the resistance of the two ends of the pin can be measured to determine the actual resistance value. In order to improve the measurement accuracy, should be measured according to the size of the nominal resistance to select the range. Due to the non-linearity of the ohmic scale, it is finer in the middle, so that the pointer indication should fall within the midpoint of the scale, that is, within the range of 20% to 80% of the full scale, Measure more accurately. According to the different levels of resistance error. ± 5%, ± 10%, or ± 20% error between reading and nominal resistance, respectively. If it does not match, beyond the error range, then the resistance value of the variable.

B, Note: test, especially in the measured resistance of dozens of kΩ or more resistance, the hand does not touch the pen and the conductive part of the resistance; the resistance from the circuit to detect the welding down, at least to open a head to avoid the circuit In the other Electronic Components of the test have an impact, resulting in measurement error; color ring resistance although the color ring to determine the color ring, but in the best use or a multimeter to test its actual resistance.

2, the detection of cement resistance. Detection of cement resistance methods and precautions and detection of ordinary fixed resistance exactly the same.

3, the detection of fuse resistors. In the circuit, when the fuse resistor blows open, can be judged according to experience: If the fuse resistor surface is black or charred, it can be concluded that the load is too heavy, through its current exceeds the rated value of many times; If the surface without any trace and open, then the flow of current just equal to or slightly larger than its rated fuse value. For the surface without any trace of the fuse resistor good or bad judgment, can be measured with a multimeter R × 1 block, in order to ensure accurate measurement, the fuse should be welded from one end of the circuit. If the measured resistance is infinite, then the fuse resistor has failed to open the road, if the measured resistance and the nominal value of a far cry, indicating that the resistance variable, it is not appropriate to use. In the maintenance practice found that there are a few fuse resistors in the circuit was short-circuit phenomenon, the detection should also be noted.

4, the potentiometer detection. Check the potentiometer, first turn the handle to see if the handle is smooth rotation, the switch is flexible, switch off, when the "click" sound is crisp, and listen to a potentiometer internal contact and resistance of the friction Sound, if the "rustling" sound, indicating that the quality is not good. Test with a multimeter, according to the measured resistance of the size of the potentiometer, select a good multimeter of the appropriate resistance range, and then according to the following method for testing.

 First of all for the detection of fixed resistors method description. In the actual component detection operation steps, the two test leads (both positive and negative) are respectively connected with the two ends of the resistor to measure the actual resistance value. In order to improve the measurement accuracy, should be measured according to the size of the nominal resistance to select the range. Due to the non-linearity of the ohmic scale, it is finer in the middle, so that the pointer indication should fall within the midpoint of the scale, that is, within the range of 20% to 80% of the full scale, Measure more accurately. According to the different levels of resistance error. ± 5%, ± 10%, or ± 20% error between reading and nominal resistance, respectively. If it does not match, beyond the error range, then the resistance value of the variable


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