What are the methods for reducing errors in resistance detection with a pointer multimeter?
First, the characteristics of detecting resistor with a pointer multimeter. When a multimeter is used to detect the resistor, because the two pens of the multimeter are parallel at the two ends of the resistor being measured, this is equivalent to a power supply with a certain internal resistor at the two ends of the detected resistor. Therefore, the resistor detected will have a current passing through and a voltage at both ends.
Second, the method of reducing the error in detecting resistor. The main contents are as follows:
(1) when detecting thermistor with an pointer multimeter, it is necessary to select a suitable position so as to avoid the detection error caused by excessive current and avoid long time measurement.
(2) when the varistor and Zener diode are detected by using an exponential multimeter, the suitable range baffle should be selected according to its voltage range, and its characteristics can be correctly detected.
(3) when the resistor is detected by using the pointer multimeter R×1, the current passing through the measured element is large, and the voltage applied to the two ends of the tested element is the highest when the resistor is detected by using the R×10k block. Therefore, when using the exponential multimeter to detect the transistor, the middle position should be chosen as far as possible, and the power consumption should not exceed the limit value of the detected transistor, so as to prevent the transistor from being damaged.
Third, must pay attention to the problem. In order to prevent the human body resistor from being parallel at the two ends of the measured resistor, the two hands should not touch the two ends of the resistor and the pen should not be touched when using the pointer multimeter to detect the resistor, which will lead to the detection error.
This article is from Allicdata Electronics Limited.