What's the difference between an analog multimeter and a digital multimeter?
When measuring voltage, pay extra attention to the position of the switch knob, and never place it on the current or resistance setting. Otherwise, it will damage the meter head, causing the meter needle to bend at the very least, and at worst, burn out the circuit components or the gossamer or deflection coil of the multimeter. When measuring high-resistance resistors, do not touch the two ends of the resistor with both hands, so as to avoid connecting human body resistance in parallel to the resistor being measured.
When measuring the resistance of a resistor mounted on an instrument, the instrument power should be turned off. One end of the resistor should be disconnected from the circuit before measurement. If there is a capacitor with a large capacitance in the part of the circuit to be measured, the capacitor should be discharged before measurement.
When measuring resistance, the zero ohm knob must be readjusted every time the range is changed. If adjusting the zero ohm knob fails to make the pointer point to zero ohm, do not twist the knob hard, but replace the battery with a new one. When reading the value, observe the pointer vertically with both eyes, and do not squint.
When storing the multimeter, place the conversion knob to the highest setting for AC current and voltage. If it is not to be used for a long time, remove the battery from the multimeter. Keep the multimeter in a dry, ventilated, and clean environment.
Digital multimeter A multimeter that displays the measured electrical parameter values numerically is called a digital multimeter. Its measurement principle is completely different from that of an analog multimeter, resulting in a different structure and usage method. It features high sensitivity and accuracy, clear and intuitive display, stable performance, strong overload capacity, and portability. Usage: Although digital multimeters adopt overvoltage and overcurrent protection, operational errors (such as using the current or resistance range to measure voltage) should still be avoided. Before measurement, carefully check whether the range switch position meets the requirements. During use, attention should be paid to not placing the digital multimeter in high temperature (>40°C), high humidity (>80%), or cold (<0°C) environments to avoid damaging the liquid crystal display.
It is strictly prohibited to adjust the range switch during measurements (voltage > 220V, current > 0.5A) to prevent the occurrence of electric arcs.
Do not use batteries or multimeter resistors to check the quality of a liquid crystal display.
Do not open the back cover of the multimeter or disassemble its components without authorization. The inside of the cover is pasted with aluminum spray paper, which should not be removed. The wire connecting to "com" underneath should not be broken.
