How can I judge the quality of the resistance level (OHM Ω)?
Answer: Please note that please do not use a resistor to measure voltage. When measuring online, the equipment should be powered off, and lines with capacitors or batteries should be fully discharged before measurement can be made. This is easier to detect. Generally, those who engage in electronic maintenance will have some resistive components on hand, so they can just measure the resistance directly.
How to judge the quality of DC current profile (DCA)?
Answer: If there is a known current source, input it directly in the current gear. If not, it doesn't matter. Just input the voltage in the current gear. If it comes out as 1, dial a gear to the low range until the valid value appears. value, please also note the following points:
A. Please do not input too high voltage to avoid excessive current and damage to the instrument. Commonly used sources that can be input include ordinary batteries, such as AA, AA, etc.;
B. When inputting the voltage and measuring the current, because the resistance (load) of the internal resistance of the instrument is very small, if the input is too long, the source will be damaged, so a single input should not exceed 5 seconds;
C. The relationship between each high and low range and adjacent ranges is generally 10 times.
How to judge the quality of capacitor profile (CAP)?
Answer: Generally, you need to find a capacitor with a known value and insert it directly into the measurement. The displayed value of each range should be in a 10-fold ratio. When testing, it is best to use a good metal capacitor, which has stable capacity and high accuracy. It is not recommended to use electrolytic capacitors for testing because electrolytic capacitors have poor stability and accuracy.
What is the basic working principle of a digital multimeter?
Answer: The basic circuit of a digital multimeter is a meter circuit. The basic function it performs is to quantify the input DC voltage (analog quantity) and output it; other functions generally require the addition of external circuits. PS: Nowadays, multimeter chips are becoming more and more integrated and have fewer and fewer peripheral circuits. This has both advantages and disadvantages. Advantages: High integration, simple external circuits, and fewer quality failures caused by component quality problems; Disadvantages: Once the chip breaks, replacement costs are high and troublesome. Sometimes the money spent to replace a chip can be used to buy another instrument, so Usually it has to be scrapped if it breaks down.
