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Since the measuring instruments are in different frequency bands, even if the instruments are similar in function, the working principle and structure are often very different. For different purposes, instruments with different accuracy are often used. For example, metrology instruments that are the standard of measurement work often have the highest accuracy. In the laboratory, more precise measuring instruments are used for quantitative measurement. In production and maintenance, simple test instruments are often used for measurement. In fact, when choosing an electronic instrument, there are far more to consider. Generally, the problems to be considered in selecting an instrument generally include:
(1) Range. What is the maximum and minimum values ​​measured? Which instrument is more suitable?
(2) Accuracy . What is the maximum error allowed by the measurement? Does the instrument's error and resolution meet the requirements?
(3) Frequency response characteristics . What is the frequency range being measured? Is the instrument frequency response flat in this range?
(4) Does the input impedance of the instrument meet the requirements in all ranges? If the input impedance is not constant, is the value change within the allowable range?
(5) Stability . What is the maximum time range allowed between calibrations? Can I work under long-term unmanned management?
(6) Environment . Does the instrument use environment meet the technical requirements? Is the power supply suitable?
(7) Isolation and shielding . Is the grounding method of the instrument suitable? Does the electromagnetic field in the working environment affect the normal operation of the instrument?
(8) Reliability . How long is the specified service life of the instrument? Is it easy to maintain?
Of course, when actually selecting an instrument, it is not necessary to consider all of the above items. For example, to measure the amplitude-frequency characteristics of an audio amplifier, mainly consider whether the frequency range and range of the measuring instrument are appropriate? Is the measurement error within the allowable range? We can select an electronic voltmeter (millimeter) or an oscilloscope as a measuring instrument based on the existing instrumentation in the laboratory. When using, pay attention to preheating, zeroing and calibrating the instrument. In order to ensure equal precision measurement, the same set of instruments should be used as much as possible during the experiment.
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