GB/T 3320.4-1982 Turntable noise test record

This test record is suitable for determining the turntable noise, signal-to-noise ratio and acoustic feedback of mono and stereo playback equipment. GB/T 3320.4-1982 Turntable Noise Test Record GB/T3320.4-1982 Standard Download Decompression Password: www.bzxz.net

National Standard of the People's Republic of China
GB/T3320.4—1982
Rumble measurement test record
Issued on December 24, 1982
National Bureau of Standards
Implementation on October 1, 1983
1 Purpose
National Standard of the People's Republic of China
Rumble measurement test record
UDC681.854
：681.842
GB/T3320.4——1982
This test record is suitable for measuring the turntable noise, signal-to-noise ratio and acoustic feedback of mono and stereo playback equipment. 2 Dimensions
2.1 Nominal diameter: 300 mm
2.2 Center hole diameter: 7.24+ mm
3 Recording content
3.1 The recording characteristics of the modulated slot are as follows:
Modulation mode
Left (L)
Right (R)
Left+right (L+R)
Left-right (L-R)
3.2 Unmodulated slot characteristics:
Slot Distance: 0.18 ± 0.01 mm
Starting diameter: 266 mm
Ending diameter: 112 mm
Root mean square value**
(cm/s)bzxZ.net
Noise of this record turntable (weighted): ≤-60 dB Duration
Note: The diameter of the measurement area is 180±5 mm, and the frequency response of the test system is 30 to 15000 Hz 2 dB. 4 Application
Refer to the provisions of Sections 4.15 and 4.16 of the national standard GB2354-1980 "Electric Record Disc". 5 Marking
*Tolerance ±3 Hz.
**Tolerance ±1 dB.
Issued by the National Bureau of Standards on December 24, 1982
Implemented on October 1, 1983
GB/T3320.4—1982
This record core can be made with reference to the following Figures 1 and 2. GB 3320.1-82 Turntable noise test film Test method GR295480 Working unit Production unit Additional remarks: This standard was proposed by the Ministry of Radio and Television. This standard was drafted by China Record Factory. GB/T3320.4-1982
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