Multimeter full manual

The multimeter is also called multi- meter , three-meter, and multiplex meter. It is a multi-function, multi-range measuring instrument. The general multimeter can measure DC current, DC voltage, AC voltage, resistance and audio level, etc. AC current, capacitance, inductance, and some parameters of the semiconductor (such as β).
First, the structure of the multimeter (500 type)
The multimeter consists of three main parts: the meter head, the measuring circuit and the changeover switch .
(1) Header
The meter head is a high-sensitivity magneto-electric DC ammeter. The main performance of the multimeter depends on the performance of the meter.
The sensitivity of the meter head refers to the value of the DC current flowing through the meter head when the meter pointer is deflected at full scale. The smaller the value, the higher the sensitivity of the meter head. The greater the internal resistance when measuring voltage, the better its performance.
There are four tick marks on the header, and their functions are as follows:
The first one (from top to bottom) is marked with R or Ω, indicating the resistance value, which is read when the transfer switch is in ohms.
The second line is marked with ∽ and VA, indicating the AC, DC voltage and DC current value. When the transfer switch is in the AC, DC voltage or DC current block, and the range is other than AC 10V, read this scale. line.
The third line is marked with 10V, indicating the AC voltage value of 10V. When the transfer switch is in the AC and DC voltage range and the range is 10V AC, the line is read.
The fourth bar is marked with dB, indicating the audio level.
(2) Measuring line
The measuring circuit is a circuit used to convert various measured DC currents suitable for meter measurement. It consists of resistors, semiconductor components and batteries. It can measure various kinds (such as current, voltage, resistance, etc.). Different ranges, after a series of processing (such as rectification, shunt, voltage division, etc.), a small DC current that becomes a certain limit is sent to the meter for measurement.
(3) Transfer switch
Its role is to select a variety of different measurement lines to meet the measurement requirements of different types and different ranges. There are generally two transfer switches, each marked with a different gear position and range.
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