How do you measure the cement resistance?
Ceramic insulated power line wound resistors are often referred to as cement resistors. The method and notice of checking cement resistance exactly the same as those of ordinary fixed resistors.
The two probes (regardless of positive and negative) respectively connected with both ends of lead resistance can be measured by actual resistance value. In order to improve the measurement accuracy, the range should be selected according to the nominal value of the resistance to be measured. Because of the nonlinear relationship between the ohmmeter scale, it is in the middle of a degree is more sophisticated, therefore should make the indicator value as much as possible to the scale of the middle position, the full scale starts from 20% to 80% within the arc, in order to make the measurement more accurate. Depending on the resistance error level. There is an error of + 5%, + 10% or + 20% for reading and nominal resistance respectively. If it does not conform to the error range, it indicates that the resistance value has changed. Note: the B test, especially in the resistance measurement of K. More than dozens of resistance, hands do not touch the pen and conductive part of resistance; resistance by detection of the welding down from the circuit, at least to a welding head, so that other components in the circuit have influence on the test result, the measurement error of the color ring; although the resistance to color marking to determine, but in use is best to use the multimeter to test the resistance.
