The adjustable resistor is one of the common electronic components, widely used in the field of security equipment, automotive electronics, industrial control, communication equipment, medical equipment, etc., so, how to determine the quality of the adjustable resistance? In fact? There are a lot of methods. Here, Xiaobian introduces a relatively simple and practical method, the specific content is as follows.
Step 1, first, according to the size of the measured resistor resistance, the suitable resistance gear of the digital multimeter is selected, measure the resistance value, that is, the resistance value in the middle of the AC on the two sides of the AC, which is more than the allowable resistance, see if the two is not Consistency, another rotation drag the circuit breaker, its value should be fixed without changing, if the resistance is endless, this resistor is damaged.
Step 2, then measure the touch condition of the heart and the resistor, that is, the intermediate resistance value of the BC, the method is a multimeter, which is a modest range. In the full process of measurement, the drive shaft gradually, pay attention to the reading value of the digital multimeter, all normal conditions, and the reading value is stably transformed toward one orientation. If there is a tremor
Status of moving, falling or clogging, indicating that the subject activity contact is a common fault in contact with poor phenomena.
Step 3, when the center is slid down or the end, the center end and the overlapping end resistance value are 0 in the case of idealization. In the specific measurement, a certain residual value (generally observed, generally less than 5Ω), is all normal conditions
.
In addition, we should pay attention to the following two points in the case of measuring the adjustable resistors:
1. It is necessary to make the table needle labeled the intermediate section of the scale line in accordance with the measured electric resistance value.
2. Define the quantity of the electric resistance gear, turn zero. The way is a short circuit failure of the two DC current meter (immediately phase resistor), adjust the "zero" household appliance to make the description of the Ω scale line of the table needle, and then test the resistance of the resistance.
In summary, the above is to determine the method of adjusting the adjustable resistance. It is not very simple to determine the quality of the adjustable resistance through the above method. Of course, some precautions are not overlooked.