Factors Affecting Noise Meter Selection
The correct selection and use of noise meter In order to make the world's production of noise meter measurements can be compared with each other, the International Electrotechnical Commission (IEC) developed a noise meter standards, and recommended that countries adopt, in May 1979 in Stockholm adopted the IEC651 "noise meter" standard, China's national standard on noise meter is GB3785-83 "noise meter electricity, sound In 1984, IEC adopted IEC804 "integral average noise meter" international standard, China and 1997 promulgated GB/T17181-1997 "integral average noise meter". They are consistent with the main IEC standards ** In 2002, the International Electrotechnical Commission (IEC) issued the IEC61672-2002 "noise meter" new international standards. The standard replaces the original IEC651-1979 "noise meter" and IEC804-1983 "integral average noise meter". Our country according to the standard developed JJG188-2002 "noise meter" test procedures. According to the new standard, the noise meter can be divided into general noise meter, integral noise meter, spectrum noise meter, etc., according to the accuracy can be divided into 1 level and 2 levels, two levels of noise meter of various performance indicators have the same center value, only the allowable error is different, and with the level of the number of figures increase, the allowable error relaxation. According to the volume can also be divided into desktop, portable, and pocket noise meter. Noise meters can be classified as analog or digital by their indication method.
Noise meter is mainly used to measure noise, and the classification of noise measurement mainly has the following kinds:
1. From the measurement object, it can be divided into the measurement of the characteristics of environmental noise ( sound field ) and the measurement of the characteristics of the sound source.
2. From the time characteristics of the sound source or sound field, it can be divided into steady state noise measurement and non-steady state noise measurement. Non-stationary noise can be divided into periodic variation noise, irregular variation noise and impulse sound.
3. From the frequency characteristics of the sound source or sound field, it can be divided into broadband noise, narrowband noise and noise containing prominent pure tone components.
4. From the accuracy of measurement requirements, it can be divided into precision measurement, engineering measurement and noise census.
Several kinds of noise measurement on the selection of noise meter
In order to unify, the international and domestic have developed a number of noise measurement standards, these standards not only provides for the method of noise measurement, but also provides for the need to use the technical requirements of the noise meter, we can be based on these standards in order to better select the appropriate noise meter.
