The detection resistor and experience oled module

1 fixed resistor is detected. A The two tables document (regardless of positive or negative) ends of each pin and the resistor connected to the actual measured resistance value. In order to improve the measurement accuracy, the measured resistance should be based on the size of the nominal value of the selected range. Since Ohm block scale nonlinear relationship, which in the middle of a more sophisticated indexing should therefore be possible to make the pointer indicates the value falls in the middle of the scale position, ie start of full scale of 20% to 80% within the arc to make measurement is more accurate. According to a different level of resistance error. Reading between the nominal resistance were allowed ± 5%, ± 10% or ± 20% of the errors. If it does not, beyond the range of error, then the value of the resistance value. B Note: The test, particularly in the measuring resistance over several kΩ resistor, the hands do not touch the Meter and the resistance of the conductive part; be detected down resistor solder from the circuit, at least to open a welding head, in order to avoid the circuit The other components of the test impacts, measurement error; color ring resistance is though to be able to determine the color ring logo, but is best when used with a multimeter to test the actual resistance. 8x2 lcd display
2 cement resistance testing. Detection of resistance of cement and testing methods and precautions ordinary fixed resistor identical.
3 fuse resistors detection. In the circuit, when the fuse resistors fuse open, you can make a judgment based on experience: If you find fuse resistors or charred black surface, it can be concluded that its overloaded exceed the rated current through it many times due; If the surface without any trace of the open, it indicates that the current flowing just equal to or slightly larger than its rated value of the fuse. For surface without any trace of bad judgment fuse resistors, can make use of a multimeter R × 1 block to measure, in order to ensure accurate measurement, should fuse resistors solder from the circuit under one end. If the measured resistance is infinite, then this fuse resistors lapsed open, if the measured resistance falls far short of the nominal value, indicating that the value of resistance change, it should no longer be used. Practice found in the maintenance, there are a few fuse resistors in the circuit is short-circuit breakdown phenomenon, testing should also be noted. 16x2 lcd display
4 potentiometer testing. Check the potentiometer, the first to turn the rotary handle, look rotary handle rotation is smooth, the switch is flexible, switch on, off "click" sound is crisp, and listen to a potentiometer resistor internal contacts and friction sound, if "rustling" sound, indicating poor quality.