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[Chemical Knowledge]：What is the range? Master this concept, easy to buy measuring instruments!

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The measuring range is one of the important parameters of the measuring instrument, which refers to the difference between the maximum value and the minimum value in the measuring range. Simply put, it is the interval between the minimum and maximum values that a metering device can measure. For example, a meter with a range of 0-200V can measure values between 0 and 200 volts. The concept of

range is very important for the use of metrology instruments. If the measuring range of the measuring instrument you choose is too small, it will not be able to measure the value you want to detect. If the measuring range is too large, it may reduce the accuracy and even damage the equipment. Therefore, if you want to measure a large range of values, you should choose a large range of measuring instruments; if you want to measure a small range of values, you can choose a small range of measuring instruments, so that the measurement results more accurate.

in daily life and work, many people need to use meters, ammeters, voltmeters, resistance meters and other measuring instruments. The range of these devices is different, according to the use of occasions and needs to choose the right equipment is very necessary. Next, we will introduce some measuring instrument range characteristics and purchase recommendations.

1. meter

meter is a measuring instrument for measuring current, mainly including ac meter and dc meter. The range of the meter is also divided into AC meter range and DC meter range. The range of AC meter is based on the effective value, usually 0-5A, 0-10A, 0-20A, 0-50A, etc. The range of DC meter is based on the maximum DC power, usually 0-100V, 0-200V, 0-500V, etc.

When choosing an electric meter, you should choose the range of the meter according to the current range you need to measure. If you need to measure the current change over a period of time, you should choose a meter with a large enough range to ensure the accuracy of the test results.

2. Ammeter

Ammeter is a measuring instrument that directly measures the current intensity in the circuit. Its range is generally divided into DC current range and AC current range. The DC current range is generally 0-2A, 0-10A, 0-15A, etc. The AC current range is based on the effective value, usually 0-5A, 0-10A, 0-20A, etc.

When selecting an ammeter, the appropriate ammeter range should be selected according to the maximum current intensity to be measured and whether it is AC or DC current. If you need to measure a current with a large variation, you should choose an ammeter with a larger range.

3. Voltmeter

Voltmeter is a measuring instrument for measuring the voltage level in the circuit. Its range is based on the maximum value of DC or AC voltage. Generally, the DC voltage range is 0-100V, 0-200V, 0-500V, etc. The AC voltage range is based on the effective value, usually 0-5V, 0-10V, 0-50V, etc.

When choosing a voltmeter, you should select the range of the voltmeter according to the voltage range you need to measure. If you need to measure a voltage with a large variation, you should choose a voltmeter with a larger range.

4. resistance meter

resistance meter used to measure the degree of resistance in the circuit of the measuring instrument. Its range is usually 0-1Ω, 0-10Ω, 0-100Ω, etc.

When choosing a resistance meter, you should choose a standard, high-precision resistance meter. If you need to measure a larger or smaller resistance value, you can choose a resistance meter with a larger or smaller range.

In short, the measuring range is one of the important parameters of the measuring instrument, which affects the accuracy and precision of the test results. When purchasing measuring instruments, the appropriate range should be selected according to the required measurement range and accuracy requirements. I hope this article is helpful for you to understand the range, so that you can successfully purchase measuring instruments that meet your needs!