The resistors should be checked before use. To check their performance is to measure whether the actual resistance value is consistent with the nominal value and whether the error is within the allowable range. The method is to use the resistance of the multimeter for measurement. Two points should be noted when measuring;

1, according to the measured resistance value to determine the range, so that the pointer is indicated in the middle of the scale line, so that it is easy to observe.

2, to determine the resistance range, to zero, the method is two meter pen short circuit (directly touch), adjust the "zero" electric appliance to make the pointer accurately refers to the "0" on the Ω scale line, and then measure the resistance value. In addition, but also pay attention to the hands do not touch the ends of the resistance or contact the metal part of the pen. Otherwise it will cause test error.

The resistance measured with a multimeter is close to the nominal value. It can be considered that the quality is basically good, if the difference is too much or not at all, it is bad.