5 Questions and Answers about Multimeters
1. What purpose does the buzzer serve?
The multimeter has a buzzer feature in addition to other features. Typically, it is around $2,000. Typically, the built-in buzzer will sound when measuring a line (or resistance) with a resistance value under 50. Practically speaking, this feature can increase the effectiveness of testing circuit continuity, a crucial task in electrical maintenance.
2. Why is it that when the digital multimeter is shorted out in the 200 range, it does not go back to zero?
It is typical to have some mantissas when shorted in the 200 range due to the resistance of the line, the internal resistance of the instrument, and the contact point. Plates with close contact points that lower value. When used, short circuit first, record the value, and then take it out of the measurement.
3. How can I tell whether my multimeter is working properly?
This is a fairly significant query. A better approach is to test out every function range. Finding the testing source is the first step in testing, but since average consumers cannot create their own standard testing sources, general testing can be evaluated using both qualitative and quantitative techniques. Finding the detection source and using it in accordance with the directions is the fundamental solution.
4. How to proofread the multimeter?
Answer: The multimeter is the same as other measuring instruments. It is adjusted by the manufacturer when it leaves the factory. Therefore, if there is no major and obvious problem, please do not adjust it at will. The head of the current multimeter is generally a voltmeter, so when you want to calibrate other gears, you must first adjust the DC voltage gear. This gear is what the industry calls the basic gear. Every gear and function (except the resistance gear) may be inaccurate. Generally, a multimeter will set one potentiometer (such as DC voltage file) or multiple potentiometers (such as temperature file) for each function, and some potentiometers are not set (such as resistance file). It is easy to handle with a potentiometer, input the detection signal, and then directly adjust it; if there is no potentiometer, generally it will not be inaccurate, in case of inaccuracy, it may be caused by damage to the instrument or poor contact of the line.
5. How to judge (test) whether the DC voltage (DCV) of the multimeter is good?
Answer: When testing, we must first find the detection source. Because we are qualitative and a little quantitative, there are many detection sources available. There are household detection sources, 1.5V alkaline/carbon batteries (No. 1, No. 5/AA, 7/AAA), 1.2V rechargeable battery, mobile phone charger, power adapter, etc. When testing, turn the multimeter to the required DC voltage range, insert the test leads according to the instructions, connect the detection source, and read the reading on the LCD. As long as the measured value is around the nominal voltage, it will be fine. .
