How to Use Multimeter to Detect Capacitors
There are many types of capacitors with different performances. For a novice, it is very important to choose the right capacitor correctly; You can choose according to the circuit requirements or according to the nominal series. For some electronic circuits, high-precision capacitors are required, such as time control circuits. We won't go into detail about this issue here. We believe that through some information and professional explanations, you can also buy suitable products;
If there is no problem with purchasing, then the next question comes. No matter how carefully you read the instructions, there may still be some problems during the operation process. Next, the editor will introduce the common faults of capacitors to you. What are the specific ones? Let's take a look together~There are three common problems: 1. Open circuit failure 2. Short circuit breakdown 3. Leakage or capacitance changes. To address these three issues, the following methods can be used for measurement (as shown in the figure)
1) When C<1 μ F, select the 10K Ω range. When C=1-100 μ F, select the 1K Ω range. When C>100 μ F, select the 100 Ω range
2) Repeatedly testing a certain capacitor, each time the tested capacitor is short circuited, the purpose is to release the charge charged by the meter to the capacitor. According to the principle, this can also be determined by checking whether there is voltage at both ends of C after the resistance meter detects C (measuring electrolytic capacitor);
3) When the capacity of the capacitor is a few thousand picometers and the pointer deflection angle is negligible, making it difficult to determine with a pointer multimeter, digital multimeters, capacitance testers, and other instruments can be used for testing.
