1.Characteristics of panel shape, measuring range and polarity of watch pen. Digital multimeter has the advantages of small volume, high precision, visual display, moderate price and so on. It has been widely used in electrical and electro…

This article briefly introduces the processing methods of adverse contact phenomenon during using pointer multimeters. The typical feature of the malfunction between the plug and the socket of the test line is that the pointer of the multi…

1. A method for detecting diodes. The range switch of the digital multimeter is set to the position marked with the diode symbol, and the red meter pen is changed to insert "V.Ω "socket is then connected to both ends of the diode using two…

First, fault judgment method Before repairing, a new battery is put into the meter. The multimeter is placed in the Rx × 1n R × 10 R × 100 or R × 1k block, and the two tables are briefly connected to see if the needle has any indication. I…

Smart phone is a modern mobile communication device with independent operating system, which can access wireless network through mobile communication network or other means, and can install a variety of applications provided by third parti…

Smart phone is a modern mobile communication device with independent operating system, which can access wireless network through mobile communication network or other means, and can install a variety of applications provided by third parti…

When multimeter is used to measure circuit parameters such as resistor, voltage, current and so on, the error will be caused not only by the low accuracy grade of multimeter, but also by the measurement method, operating environment and ot…

1.Inductor Introduction. Inductor (inductor coil) is a kind of electromagnetic induction element, which is made of insulated wire (such as enamelled wire, yarn wrapped wire, etc.). It is a kind of energy storage device in magnetic field, a…

First, the characteristics of detecting DC current with an pointer multimeter. When the DC current is detected by using the pointer multimeter, the voltage of the multimeter will reduce the equivalent voltage of the circuit because the two…

For the limited measuring precision of the pointer multimeter, the detection error is related to the parameters, detection methods and operating conditions of the pointer multimeter, especially the parameters, sensitivity and voltage of th…