What is the buzzer function used for?
Answer: The buzzer function is an additional function of the multimeter. It is usually set in the 2KΩ range. Generally, when measuring a line (or resistor) with a resistance value below 50Ω, the built-in buzzer will sound. This function plays a great role in practice. It can improve the efficiency of measuring circuit continuity and is an essential function for electronic maintenance.
2. Why does the digital multimeter not return to zero when short-circuited at 200Ω?
Answer: In the 200Ω range, due to the resistance of the circuit, the internal resistance of the instrument and the contact point, it is normal to have some mantissas when short-circuiting. This mantissa will become larger and larger during use and cannot be adjusted. However, it can be adjusted by scrubbing the line. board, close contact points to reduce the value. You can short-circuit it first during use, write down the value, and subtract it from the measurement.
3. How to make sure the multimeter is good?
Answer: This is a relatively big question. It is a better method to try each function range. When testing, you must first find the testing source. However, it is impossible for ordinary users to prepare their own standard testing sources. Therefore, general testing can be measured using a qualitative and a little quantitative method. The basic plan is to find the detection source and then use it according to the instructions.
4. How to calibrate a multimeter?
Answer: Multimeters are the same as other measuring instruments. They are adjusted by the manufacturer when they leave the factory. Therefore, if there are no major and obvious problems, please do not adjust them at will. Today's multimeters generally have a voltmeter on the meter head. Therefore, when calibrating other gears, you must first adjust the DC voltage gear. This gear is what people in the industry call the basic gear. Once this gear is inaccurate, the basic voltage will be lost. Every gear and every function (except the resistance gear) may be inaccurate. Generally, multimeters will have one potentiometer (such as DC voltage level) or multiple potentiometers (such as temperature level) set for each function, and some may not have a potentiometer (such as resistance level). If there is a potentiometer, it is easy to do it. Just input the detection signal and then adjust it directly. If there is no potentiometer, it will generally not be inaccurate. If it is inaccurate, it may be caused by damage to the instrument or poor circuit contact.
