Rated power rating and detection method of fixed resistance

1.The rated power of the resistor

The rated power of the resistor is divided into 19 grades, commonly used are 0.05W, 0.125W, 0.25W, 0.5W, 1W, 2W, 3W, 5W, 7W, 10W.

2. How to detect a fixed resistor?

( 1 ) Measurement of the actual resistance value :Rotating the function selection switch of the pointer type multimeter to an appropriate range of electric barrier, and short circuit of the two stylus. Adjust the zero knob, so that the meter pointer points to " 0 ", that is, zero adjustment, and then measured. Pay attention to the range of each transformation must be re-adjusted, and then measured.

(2) will be two pen ( regardless of the positive and negative ) are connected with the two ends of the resistor, you can measure the actual resistance. In order to improve the measuring accuracy, the range should be selected according to the nominal value of the measured resistance. Due to the nonlinear relationship of the ohm gear scale, the middle section is more delicate, so the pointer indication value should be placed in the middle section of the scale as far as possible, that is, within the range of 20 % to 80 % of the starting of the full scale, so that the measurement is more accurate. According to the difference in the error level of the resistor, the error between the reading and the nominal resistance is 5 %, 10 %, or 20 %, respectively. If not, and beyond the error range, it shows that the value of the resistor. If the result is 0, it means that the resistor has been short-circuited. If it is infinite, it means that the resistor is broken, and it can no longer be used.

 What should be noted in the measurement : when testing large resistance resistor, do not touch the conductive part of the stylus and resistor, because the human body has a certain resistance, will have a certain impact on the test, so that the reading is small. The detected resistor must be soldered from the circuit, so as to prevent other components in the circuit from having an impact on the test, and the measurement error increases.

If you want to know more, our website has product specifications for different kinds of resistors, you can go to ALLICDATA ELECTRONICS LIMITED to get more information