BS EN IEC 60098:2020 pdf download – Analogue audio disk records and reproducing equipment.
6.7 Marker space The pitch of the lead-over groove in a marker space shall be not greater than 1 ,6 mm. A marker space shall not occur at a diameter of less than 1 27 mm. 6.8 Lead-out groove The pitch of the lead-out groove shall be 6,4 mm ± 3,2 mm. The top width of the lead-out groove shall increase to a minimum of 0,075 mm when the pitch exceeds 6,4 mm. The lead-out groove shall have at least one turn. 6.9 Finishing groove The diameter of the finishing groove shall be: • 1 06,4 mm ± 0,8 mm for types 3033, 2545 and 2533 and 3045; • 97,4 mm ± 1 ,0 mm for types 1 733 and 1 745. 7 Label information The label shall give at least the following information: a) catalogue number; b) if there is more than one record, side number and total number of sides, for example “Side 5 of 8”; c) programme title; d) nominal speed of rotation; e) type of recording. If stereophonic, it shall be clearly marked with either the word “STEREO” or with the symbol specified by IEC 6041 7-5071 :2002-1 0. Word and symbol may be used simultaneously. If monophonic, it shall be clearly marked with either the word “MONO” or with the symbol specified by IEC 6041 7-5070:2002-1 0. Word and symbol may be used simultaneously.
8 Recording and reproducing characteristics 8.1 Recording characteristic 8.1.1 Standard recording characteristic The standard recording characteristic shall be a combination of the following three curves: • one rising with increasing frequency in conformity with the admittance of a parallel combination of a capacitance and a resistance having a time constant of t 1 = 75 µs; • one falling with decreasing frequency in conformity with the admittance of a series combination of a capacitance and a resistance having a time constant of t 2 = 31 8 µs; • one rising with decreasing frequency in conformity with the impedance of a series combination of a capacitance and a resistance having a time constant of t s = 3 1 80 µs.
8.1.2 Recording chain tolerances The frequency characteristic of the recording chain shall be a smooth curve lying within ±2 dB of the standard recording characteristic in the frequency range from 50 Hz to 1 0 kHz, taking as reference point the value at 1 kHz. NOTE When measuring the frequency characteristic of the recording chain by means of a rated reproducing chain, the rated reproducing characteristic is not a mirror image of the rated recording characteristic at frequencies below 200 Hz. On a stereophonic record, the unbalance between stereo channels at 1 kHz should not exceed 1 dB, while the unbalance at all other frequencies between 50 Hz and 1 0 kHz should not exceed 2 dB.
8.2.2 Reproducing chain tolerances a) 2 Hz to 20 Hz: The frequency characteristic of the reproducing chain shall be a curve which shall always lie at or below the standard reproducing characteristic, taking as reference point the value at 1 kHz. b) 20 Hz to 20 kHz: No tolerances are specified for the frequency characteristic of the reproducing chain. 9 Reproducing equipment 9.1 Speed of rotation The speed of rotation during reproduction shall be within ±2 % of the rated reproducing speeds of 33⅓ r/min and 45 r/min. NOTE Verification of the reproducing speed of 45 r/min by means of stationary stroboscopic bars in countries employing 50 Hz electric supplies can be made at 45,1 1 2 r/min only. 9.2 Automatic pickup lifting When the pickup is in the playing position, the automatic pickup lifting mechanism of a record player shall not become operative at a diameter of more than 1 27 mm. 9.3 Reproducing stylus 9.3.1 Clearances The clearance between the stylus tip and the bottom of the groove shall be 0,002 mm minimum, and the stylus tip shall not touch the groove’s edges. 9.3.2 Included angle (spherical styli only) The included angle of the reproducing stylus shall not exceed 55°.