In the toolkit of electricians, multimeters and megohmmeters are known as the “twin tools,” but their principles and uses are quite different. Understanding these is essential for precise electrical measurements, achieving more with less effort! 1. Multimeter: The ‘Measuring Philosopher’ A multimeter, also known as a multifunction meter, is a “jack of all trades” for … Read more
In the PCB industry, many friends will come into contact with conformal coatings. So, what exactly is this conformal coating? Today, let’s take a closer look. Conformal coating is a special formulation of paint primarily used to protect circuit boards and related equipment from environmental erosion. (Conformal coating refers to moisture-proof, salt spray-proof, and mildew-proof) … Read more
1. Short circuit to ground in the motor: The testing method involves connecting one end of the megohmmeter to ground and the other end to the motor terminal. If the insulation reads zero, it indicates a short circuit. 2. Open circuit between windings: The testing method involves connecting the megohmmeter to the two motor terminals. … Read more
1. Targeted Measurement with Multimeters 1. Correct Use of Multimeters To correctly use a multimeter, one must be familiar with the dial. Adjust the two zero position regulators gently. Choose the correct terminals, ensuring the red and black probes are inserted into the right holes. Rotate the switch to the correct range setting. Choose the … Read more
How to measure leakage current with a multimeter, methods for measuring leakage current with a multimeter. Using the continuity setting of the multimeter, measure between the ground and the circuit being tested. If the meter shows a resistance value, it indicates that there is no insulation. However, in practice, to measure leakage current, a megohmmeter … Read more
1. Usage of Multimeters 1. Understanding Common Symbols on Multimeters Types of electrical measurements and switch positions: ACV (or V) — AC voltage range, typically includes 2.5V, 10V, 50V, 250V, 500V, etc. DCV (or V) — DC voltage range, typically includes 0.5V, 2.5V, 10V, 50V, 250V, 500V, etc. DCmA (or mA) — DC milliamp range, … Read more
A digital multimeter is an electronic instrument used for electrical measurements. It can have many special functions, but its main functions are measuring voltage, resistance, and current. As a modern multipurpose electronic measuring instrument, it is primarily used in the fields of physics, electricity, and electronics. In daily life, you may encounter situations where household … Read more
How to use a multimeter to check if the water pump motor coil is burned out? To determine the quality of the motor, three conditions must be measured: the absence of open circuits and short circuits between the coil windings, and the insulation resistance. First, check whether the motor is a three-phase motor or a … Read more