Three-phase asynchronous motors are widely used. When electricians are repairing motors, they often encounter some old motors that lack nameplates or markings, or the nameplates and markings are unclear. How to use a multimeter to determine and test the motor windings, number of poles, speed, etc., is discussed below. 1. Determining the Start and End … Read more
Search on WeChat Technical Training The clamp multimeter is composed of a current transformer and a meter. The core of the current transformer can open when the clamp is tightened; the wire carrying the current to be measured can pass through the gap of the opened core without being cut, and when the clamp is … Read more
★ The diagram helps to understand the internal principles of the multimeter, why it can measure high voltage, and under what circumstances measuring high voltage could damage the meter. The diagram can be used to repair multimeters and to create multimeters. 1. DC 2.5V. Set the left switch to 2.5V and the right switch to … Read more
The use of a multimeter can be divided into the following types: First, turn the knob to the AC voltage measurement position, perform mechanical zeroing, and when the value is zero, use the two probes to contact the live wire and the neutral wire of the circuit to be tested. Second, turn the knob to … Read more
01 DM3068 Digital Multimeter 1. DM3068 Digital Multimeter This is a RIGOL six-and-a-half digit digital multimeter, model DM3068. Yesterday, while using this multimeter in DC mode to test the DC signal in a square wave signal, I encountered a major pitfall. The frequency of this square wave signal is 1kHz, with a low level of … Read more
Click “Read the Original Text” or scan the QR code to grab the order Correctly using a multimeter can not only quickly and accurately identify the fault location but also prevent damage to electrical equipment and the multimeter itself. 1. Before measuring, check the range; don’t measure without checking. Every time you pick up the … Read more
Whenever a circuit board fails to operate normally, and the wiring checks out, it is very likely that an electronic component has failed. To repair it, you must identify the faulty component and replace it. However, locating the faulty component requires technical skills and certain techniques. Today, I will teach you how to use a … Read more
Correctly using electrical measuring instruments is an essential skill for circuit maintenance and repair. What instrument should we choose for different usage scenarios? 1. Multimeter A multimeter is a versatile electrical measuring instrument, commonly used by electricians, electronics technicians, and in the production and maintenance of electrical equipment. It can measure direct current, direct voltage, … Read more
The measurement process of a digital multimeter involves converting the measured value into a direct current voltage signal through a conversion circuit, then converting the analog voltage into a digital quantity via an analog-to-digital (A/D) converter. The result is then counted by an electronic counter and displayed directly on the screen as a digital readout. … Read more
1. Measuring AC and DC Current Select the appropriate current measurement range based on the size of the current to be measured, and insert the red probe into the “A” current jack. When measuring DC, the red probe (inserted into the current jack) should contact the higher voltage side, and the black probe should contact … Read more