GB/T 3383-1982 Telecommunications transmission units-decibel

This standard specifies the telecommunication transmission units and their codes. GB/T 3383-1982 Telecommunication transmission units - decibel GB/T3383-1982 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Telecommunication transmission unit -decibel
Telecommunication transmission unit -decibelThis standard specifies the telecommunication transmission unit and its code. UDC 621.39
GB 3383-82
This standard is formulated with reference to the B series recommendations (Expressions) of the International Telegraph and Telephone Consultation Committee (CCITT). "Decibel" is uniformly used as the telecommunication transmission unit. The code for decibel is dB, with the letter d in lowercase and the letter B in uppercase. Note: When the logarithm with base e must be used in theoretical research and scientific calculations, neper can still be used, with the code NP. 2 Commonly used telecommunication transmission unit codes for different measurement conditions and their meanings. 2.1dBm takes 1 milliwatt as the reference value and expresses the absolute power level in decibels. m is the code for milliwatts. 2.2dBr Relative level expressed in decibels relative to the selected transmission reference point. r is the code for relative level. 2.3dBm0 The absolute power level of the signal expressed in decibels relative to the zero relative level point, taking 1 milliwatt as the reference value. 0 is the code for the zero relative level point.
2.4dBmp The absolute noise meter power level (telephone weighted) expressed in decibels, taking 1 milliwatt as the reference value. p is the code for noise meter weighted measurement. bZxz.net
2.5dBm0p The absolute noise meter power level (telephone weighted) expressed in decibels, taking 1 milliwatt as the reference value. | |tt||2.6dBm0s takes 1 milliwatt as the reference value, relative to the zero relative level point in the sound program transmission, and the absolute power level is expressed in decibels. s is the code for sound program transmission.
2.7dBmops takes 1 milliwatt as the reference value, relative to the zero relative level point in the sound program transmission, and the absolute power level is expressed in decibels (sound program weighted).
2.8dBrs The relative level of the sound program signal expressed in decibels (this abbreviation is only applicable to points in the sound node circuit that can be converted with simple coefficients relative to the input end).
2 .9dBq0s takes 0.775 volts effective value as the reference voltage, relative to the zero relative level point in the sound program transmission, and uses a quasi-peak noise meter to measure without weighting, and the absolute voltage level is expressed in decibels. q is the code for measuring with a quasi-peak noise meter. 2.10dBq0ps takes 0.775 volts effective value as the reference voltage, relative to the zero relative level point in the sound program transmission, and uses a quasi-peak noise meter to measure with weight (sound program weighting), and the absolute voltage level is expressed in decibels. 2.11dBqs takes 0.775 volts effective value as the reference voltage, uses a quasi-peak noise meter to measure without weighting, and the absolute voltage level is expressed in decibels. The absolute voltage level expressed.
2.12dBqPs takes 0.775 volts effective value as the reference voltage, and uses a quasi-peak noise meter to measure the absolute voltage level in decibels (weighted by the sound syllable function).
2.13dBw takes 1 watt as the reference value, and expresses the absolute power level in decibels. W is the code for watts. dBu takes 0.775 volts effective value as the reference value, and expresses the absolute voltage level in decibels. u is the code for 0.775 volts. 2.14
2.15dBV takes 1 volt as the reference value, and expresses the absolute voltage level of the signal in decibels. V is the code for volts. 2.16dBμV takes 1 microvolt as the reference value, and expresses the absolute voltage level in decibels. μV is the code for microvolts. dB(W/m2) takes 1 watt per square meter as the reference value, and expresses the power flux density in decibels. 2.17
dB (μV/m) The electric field strength expressed in decibels, taking 1 microvolt per meter as the reference value. 2.18
Promulgated by the National Bureau of Standards on December 29, 1982
Implemented on October 1, 1983
Additional notes,
GB3383-82
This standard was proposed by the Ministry of Posts and Telecommunications of the People's Republic of China. It is under the jurisdiction of the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications. This standard was drafted by the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications. The main drafter of this standard is Xi Yujiu.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.