Precautions for Using Analog and Digital Multimeters
A multimeter is an electrical instrument with high cost-effectiveness, complete functions, simple operation, and easy portability, making it a true love for electronics enthusiasts. According to the principle of measurement, it can be classified into pointer multimeters and digital multimeters. I believe everyone has some understanding of daily maintenance, but there may still be some operational errors. Today, we will introduce these two products to you:
Pointer multimeter
A pointer multimeter is composed of an indicator device, measuring circuit, conversion switch, and housing, and is used for measuring various currents and voltages; Therefore, it can be used as an ammeter, voltmeter, ohmmeter, etc. The following are the precautions before use, which can be mainly based on three parts:
Before using a pointer multimeter, install the battery, perform mechanical zeroing, and install the probe.
1. Install the battery
When installing the battery, first remove the battery cover behind the multimeter, and then install one No. 2 1.5V battery and one 9V battery into the corresponding battery sockets. When installing, pay attention to the polarity of the two batteries being consistent with the polarity marked on the battery box. If the multimeter is not equipped with a battery, the resistance mode (also serving as the capacitance/load voltage/hFE mode) and the path buzzer mode will not be able to be used, while the voltage and current modes can still be used.
2. Mechanical calibration
Mechanical zeroing operation
Place the multimeter flat on the desktop and observe if the needle points to the "0" position on the left end of the voltage/current scale line (i.e. the "∞" position on the left end of the Ohm scale line). If it does not point to that position, use a screwdriver (commonly known as a screwdriver) to adjust the initial IM zero calibration knob so that the needle points to the left end of the voltage/current scale line.
3. Insert probes
A multimeter has two probes, red and black. When measuring, the red probe should be inserted into the socket marked with a "+" symbol, and the black probe should be inserted.
