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what is a multimeter

by:HoldPeak     2020-01-14
A multimeter is a universal measuring instrument.
Measurement of voltage, current, resistance, and inspection of open wires.
For each of these measurements, special measuring instruments such as ohmmeter, ammeter and voltmeter can be used.
The voltmeter is used to measure the voltage, the ammeter is measured through the ammeter, and the Ohm is used to measure the resistance, but the multimeter is a general equipment for measuring the voltage, current and resistance.
Therefore, an ammeter voltmeter = multimeter.
There are two basic types of Multimeter: analog and digital.
In the analog multimeter, the measurement result is read by the movement of the hand (On the clock)
Measurement scale relative to the Applied Value: voltage, current, resistance.
In many, especially in China, it is not very convenient to achieve the scale, and the measurement will bring some problems.
The popularity of analog multimeters is explained by their availability and price, and the main drawback is that there is a significant error in the measurement results.
In the analog multimeter for more precise adjustment, there is a special structural resistance that can achieve higher accuracy through operation.
However, the digital multimeter is preferred in cases where more accurate measurement results are required.
In addition, the analog multimeter was stopped almost everywhere.
Do you want to choose the best multimeter?
You have to read our article about it again!
The main difference between the digital multimeter and the analog multimeter is that the measurement results are displayed on a special screen (
LED or LCD).
The digital multimeter has higher measurement accuracy and is distinguished with ease of use, because it is not necessary to understand all the subtleties of scale calibration, analog equipment, compared to analog instruments.
The new multimeters with graphical displays are able to display the waveform, so they can even be attributed to the simplest oscilloscope. Those.
The multimeter absorbs the features of more and more devices.
In addition, some multimeter can work under computer control and transmit the measurement results to it for further processing (
Generally, portable via RS-Portable
232 interface and desktop interfacevia GPIB).
So, what should each multimeter have.
There are two to four outlets for any multimeter (
More in Old Russian)
Two outputs in black and red.
Conclusions of Black are common (mass).
Red is called a potential output for measurement.
The socket of the general output is marked as com or simply (-)
, That is, the output itself may have so-
At the end is called \"crocodile\" so that it can be connected to an electronic circuit during measurement.
The red pin is inserted into a socket marked with a resistor or voltage symbol (ft, V or +).
In this case, if the number of sockets is more than two, then the other sockets are usually used to measure the red output of the current and marked as A (amperes), mA (milliamperes)
10A or 20 a, respectively.
The multimeter switch is used to select one of several limits of measurement.
For example: constant (DCV)
And Alternate (ACV)
The voltage: 10 V, 50 V, 250 V, 1000 V. Current (mA): 0.
5 mA, 50 mA, 500 mA. Resistances (Ω)
: X1K, X100, X10, which means multiplying by a certain value, usually as standard with a digital multimeter: 200 Ω, 2 k Ω, 20 k Ω, 200 k Ω, 2
On digital multi-meters, the measurement limit is usually larger, and additional functions are usually added, such as frequency meters, checking the conversion of transistors, audible \"ringing\" of diodes, measuring the capacitance of capacitors, even temperature sensors.
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