The non-sinusoidal wave generating circuit is similar in function to the sinusoidal wave oscillating circuit, and is also used to generate a signal output of a certain frequency and amplitude. Therefore, it also has a frequency and its stability, amplitude and stability, waveform quality, and the like, wherein the frequency The indicator is the most important. Therefore, the non-sinusoidal oscillation circuit also needs to debug the frequency, amplitude and waveform. Since the signal to be measured is non-sinusoidal, the oscilloscope is mainly used for measurement, and the digital frequency meter can be used for measuring frequency. The adjustment and test methods of the non-sinusoidal generation circuit are basically the same as those of the sine wave circuit, but there are some differences. The differences are now explained.
Filter mesh refers to small aperture metal mesh or other materials with smaller apertures for a variety of different filtration, dust removal and separation requirements. They are widely used in shower panel, sanitary pipe systems, purifiers, electronic components, to remove contaminants or in applications, such as coffee machine, soya milk machine, to extract a filter cake. Because the metal mesh filters are one of the most durable filter media available, the material is mainly made of copper, iron, steel, nickel, stainless steel, alloy. It is acid resistant, alkali resistant, temperature resistant and wear resistant.
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Flow Rate
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1. Debugging of amplitude Since the non-sinusoidal generating circuit is mainly used to generate non-sinusoidal signals such as square waves and triangular waves, the devices in the circuit work in a strong nonlinear region for a long time, and only output high-level and low-level signals. The magnitude of the amplitude is not determined by the loop gain, but is determined by the combination of the current and voltage and the supply voltage value of the device entering a strong nonlinear state. In order to obtain a certain and stable amplitude, high-precision voltage regulators are usually used to control the output high and low levels. It is convenient to obtain the required output voltage range by changing the voltage regulator tubes with different stable voltages. . In the non-sinusoidal wave generating circuit, the oscillation frequency is independent of the stable voltage of the Zener diode, so the oscillation frequency is not changed when the oscillation amplitude is adjusted. The amplitude of the triangular wave can also be achieved by adjusting the upper and lower threshold voltages of the comparator. The amplitude of the oscillation is measured with an oscilloscope.
2. Debugging of waveforms (1) Non-sinusoidal oscillation waveforms are observed with an oscilloscope. For the square wave signal, the steepness of the rising and falling of the square wave is mainly observed, and whether the front and rear edge times satisfy the requirements is measured. If the front and rear edges of the square wave are not steep, check whether the conversion rate of the integrated operational amplifier as a comparator is not high enough. You can test it with a high conversion rate. You should pay attention to the higher the oscillation frequency and the conversion rate of the integrated operational amplifier. It should also be bigger.
(2) For the triangular wave (or sawtooth wave), the linearity of the rising and falling of the triangular wave is mainly observed (refer to the linear change of the voltage with time). If the front and rear edges of the square wave are not steep, the valley and the peak of the triangular wave are found to be round. The arc, that is, the linearity of the triangular wave is deteriorated, so the steeper the front and back of the square wave, the better the linearity of the triangular wave.
3. Frequency debugging (1) There is no frequency selection circuit in the non-sinusoidal generation circuit. The oscillation period is mainly determined by the energy change speed of the energy storage element in the integration circuit, so the frequency of the non-sinusoidal oscillation can be adjusted by the integration circuit. The resistor and the capacitor are realized. Of course, the frequency adjustment can be performed by changing the magnitude of the charging and discharging current of the current source. The frequency of the charging and discharging current in the integrating circuit is changed and the capacitance is changed to adjust the frequency without affecting the oscillation amplitude.
(2) Frequency stability can be obtained by measuring the relative amount of change in frequency over a period of time.
One of the most significant advantages metal mesh has over most filter media used today is its ability to deliver an adequate flow rate. This is achievable as the wire diameter and mesh opening can be customized to perfectly match the contaminants you are filtering out, providing you with an enhanced level of filtration surface area.
Durability
300 series stainless steel is predominantly used. This helps create a filter that can withstand a wide range of impurities, pressure variations, and extreme temperatures without hindering the filter's accuracy. In addition, stainless steel is a very pliable material, allowing the filter to be formed to fit your filter system and hold its shape after several uses.
Accuracy
The weaving process used to construct mesh filters is heavily monitored from start to finish. As a result, the pore openings of the filter are exact and uniform throughout the filter. These precise pore opinings ensure that the end product, whether a filtered substance or a filter cake, is consistent and complies with industry standards.
Clean ability
As metal mesh features accurate pore openings, blinding and plugging are significantly reduced. This, combined with the enhanced flow rate, means system operators can clean the metal mesh easily. These two properties allow the mesh filter to be backflushed and purged of any unwanted debris with minimal pressure.