With the popularity of the acidity meter, more and more users are concerned about the quality of the acidity meter. Therefore, some common methods for determining the quality of the acidity meter are roughly discussed.
From the point of view of use, the determination of the acidity meter is mainly reflected in:
1. Correctness: The acidity meter without correctness has no use value. The method of judgment is to use a high-precision instrument or a high-precision standard liquid calibration.
2, stability: an unstable acid meter reading is difficult, it is difficult to ensure the correctness of the instrument, stability in two aspects, on the one hand is the stability of a single instrument, you can put the same instrument for a long time to stabilize the solution In the middle, see if the value changes and the magnitude of the change; on the other hand, the stability of multiple instruments, put several calibration instruments of the same type in the same stable solution to see if the readings are consistent, and how many errors, if several models of the same model Stability cannot be guaranteed between instruments, so it is difficult to ensure the correctness and stability of each instrument.
3. Adjustment of common error: Temperature is the most obvious factor causing PH error. The presence or absence of temperature probe and the sensitivity of temperature probe also affect the use of the instrument.
4, easy to operate, beautiful interface: the user is relatively easy to determine this aspect, some old-style instruments, using analog switches, resulting in difficult calibration, small changes are not easy to detect, easily produce fatal system errors. On the other hand, considering the cost and technology reasons, there are still many instruments that use LED digital tubes, and the display content is not rich enough. Of course, some manufacturers have made up for this shortcoming through certain means. At present, the more convenient interface for manipulation is generally LCD liquid crystal display keyboard operation.
5, the pros and cons of the probe: This point is undoubted, the performance of the probe directly affects some of the technical indicators of the instrument, and the superior instrument equipped with inferior probes will not help.
6. Security: In recent years, more and more customers have begun to pay attention to the safety of operation. Well-designed instruments with a lower safe voltage input can greatly improve safety performance.
From a technical point of view, it is mainly reflected in:
1. Design principle: The design principle is the soul of the whole machine. The excellent design can reduce the cost while improving the precision. This point is that everyone who is wise sees wisdom and benevolent sees benevolence. But one of the biggest differences is the difference between analog circuits and numerical circuits. With the development of technology and the reduction of the price of single-chip microcomputers, numerical circuits have become mainstream products in recent years. Many of his advantages are unmatched by analog circuits.
2, production process: no matter how good design, no matter the good product, if there is no good production process and inspection means is not helpful, the manufacturing process is mainly reflected in the internal lines and components, many units take into account the cost and technology, the internal lines are disorderly rough Or use low-quality components, such an instrument can not guarantee his long-term correct stability and safety.
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