Do you know these most commonly used instruments

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Encyclopedia: do you know these most commonly used instruments

multimeter, also known as multiplex meter, multi-purpose meter, three-way meter, multi-purpose meter, etc., is an indispensable measuring instrument in power electronics and other departments, and its main purpose is to measure voltage, current and resistance. The multimeter is divided into pointer multimeter and digital multimeter according to the display mode. It is a multi-function and multi range measuring instrument. Generally, the multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, and some can also measure AC current, capacitance, inductance and some parameters of Semiconductors (such as β) Etc

2. Oscilloscope

oscilloscope is an electronic measuring instrument with a wide range of uses. It can transform invisible electrical signals into visible images, which is convenient for people to study the change process of various electrical phenomena. The oscilloscope uses a narrow electron beam composed of high-speed electrons to hit the screen coated with fluorescent substances, which can produce small light spots (this is the working principle of the traditional analog oscilloscope). Under the action of the measured signal, the electron beam is like the tip of a pen, which can depict the change curve of the instantaneous value of the measured signal on the screen. The oscillograph can be used to observe the waveform curves of various signal amplitudes changing with time, and it can also be used to test various electric quantities, such as voltage, current, frequency, phase difference, amplitude adjustment, etc

3. Signal source

signal source (generalized conceptual English term: source or Si, you can rest assured to understand gnal source; in the process of practical application, you can use specific nouns, such as signal generator, document process calibrator fluke 743B, etc.) It refers to receiver, tuner, recording cassette holder, video cassette holder and other devices. Complete signal extraction, digital to analog conversion, digital signal processing and other functions. Signal source is an important part of radar system. Radar systems often require signal sources to be stable, reliable, easy to implement, with pre distortion function, and the generation of signals and the change of signal parameters are simple and flexible

4. Frequency meter

frequency meter, also known as frequency counter, is an electronic measuring instrument that specially measures the frequency of the measured signal. The frequency meter is mainly composed of four parts: time base (T) circuit, input circuit, count display circuit and control circuit

5. Spectrum analyzer

spectrum analyzer, also known as spectrum analyzer, is a kind of testing and measuring equipment, which is mainly used for frequency domain analysis of RF and microwave signals, including the power, frequency, distortion products of measured signals, etc. According to the working principle, there are two basic spectrums. First, check whether the installation of the pressure testing machine is horizontal, and level the main engine with a frame level in two directions perpendicular to each other on the outer ring of the working oil cylinder Adjust the front and rear levels of the dynamometer on the front of the swing rod, align and fix the edge of the swing rod with the inner scribed line, and adjust the left and right levels of the body with a level ruler against the side of the swing rod Drain and clean the internal parts of the oil cylinder and change the oil with suitable viscosity The dynamometer instigates the driven needle of the device to grind, but the friction force is too large, and the gear tooth rod is too dirty. You can use gasoline to clean and adjust the compression screw and the upper limit plate of the tooth rod, and replace the belt on the dynamometer piston, which can achieve the purpose of eliminating errors and make the pressure testing machine reach the qualified use state Types: real-time spectrometer and swept frequency tuning spectrometer. The real-time spectrometer includes multi-channel filter (parallel) spectrometer and FFT spectrometer. Swept frequency tuned spectrometer includes swept RF tuned spectrometer and superheterodyne spectrometer

6. Digital bridge

digital bridge is an instrument that can measure inductance, capacitance, resistance and impedance. This is a traditional saying. The earliest impedance measurement used a real bridge method. With the development of modern analog and digital technology, this measurement method has been eliminated, but the name of LCR bridge has been used until now. LCR bridge with microprocessor is called LCR digital bridge. General users also call these LCR testers, LCR bridges, LCR meters, LCR meters, etc

7. Logic analyzer

logic analyzer is an instrument for analyzing the logical relationship of digital system. Logic analyzer is a kind of Bus Analyzer belonging to data domain test [2] instruments, which is based on the concept of bus (multi line) and observes and tests the data flow on multiple data lines at the same time. This instrument is very effective for the test and analysis of complex digital systems. Logic analyzer is an instrument that uses clock to collect and display digital signals from test equipment. Its main function is to determine timing. Since the logic analyzer does not have many voltage levels like the oscilloscope, it usually displays only two voltages (logic 1 and 0), so after setting the reference voltage, the logic analyzer will judge the measured signal through the comparator. Those higher than the reference voltage are high, and those lower than the reference voltage are low, forming a digital waveform between high and low

8. Power meter

power meter is an instrument for measuring electric power. Generally, it refers to the power meter that measures power in DC and low-frequency technology, which can also be called wattmeter. The power meter consists of a power sensor and a power indicator. Power sensor, also known as power meter probe, converts high-frequency electrical signals into electrical signals that can be detected directly through energy. The power indicator includes signal amplification, transformation and display. The display directly displays the power value. The power sensor and the power indicator are connected by cables. In order to meet the needs of different frequencies, different power levels and different transmission line structures, a power meter should be equipped with several power meter probes with different functions

(data collated from various encyclopedias)

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