Analogue audio disk records and reproducing equipment

BS EN IEC 60098:2020 pdf free.Analogue audio disk records and reproducing equipment.
For information and marking requirements, refer to the applicable IEC safety standard, usually IEC 62368-1.
The following information shall be provided;
a) stylus force in mN; statement in gm-force may be added:
b) load impedance per channel, expressed as a parallel combination of resistance in kC) and capacitance in pF;
C) external correction network (if required);
d) external equalization network (if required).
Before any measurements are taken, the unit shall operate for at least the recommended time for stabilization and all measuring equipment shall have reached temperature stability.
The output of the unit shall be taken from the correction or equalization network (if any) i.e. the measurement shall be made at that point where the signal has the characteristic that is to be reproduced. For stereo pickups, both channels shall be terminated in accordance with item b) above. Apart from that load, the measuring equipment shall not introduce an additional load that would significantly affect the characteristics to be measured.
If a test record is used for any measurement, it shall be identified by catalogue number, name of manufacturer and country of manufacture.
Information on test records is given in Annex A. Annex B. Annex C, Annex D and Annex E.
NOTE In order to achieve comparable results, test records for a particular purpose should be derived from the same original recording. However, even given this condition, variations in record manufacture, such as record material and pressing conditions, can give rise to variations In characteristics such as high-frequency characteristics, separation characteristics, wow, flutter and rumble.
The methods of measurement apply to complete record playing units only. If measurements are made on components of record playing units (e.g. turntables, pickup cartridges), the precise details of the remaining parts of the record playing unit used for measurement shall be stated in the test report.
The sensitivity of the measuring equipment shall be sufficiently independent of frequency to achieve the required accuracy of measurement.
Specification: the maximum apparent power consumption occurs when it operates at rated voltage and under maximum mechanical load.
Method: the current, I (in A). taken from the supply source shall be measured to an accuracy of ±3% while the unit is operated under standard measurement conditions.
Statement of result: maximum power consumption = (I x VR) VA, where r is the rated voltage.
NOTE In addition, the above measurements can be made at maximum voltage and maximum mechanical load condtlons.
Mean deviation from rated speed
Specification: mean deviation from rated speed, as a signed percentage of rated speed.
Method A: a stroboscope (n bars) rotating with a record being played is illuminated by a neon lamp operated at power supply frequency 1Hz. The power supply frequency shall be checked, as tolerances vary between systems, and any necessary correction taken into account in the result.
Viewing from above the record, the number of apparent bars passing a fixed point per second (N) is counted, clockwise movement being regarded as positive (+N), anticlockwise movement as negative (-N).
The relations of rated speed and measured speed to a, /and N are given in Table 3.
Method: a test record (see Annex B) containing a lateral signal of 3 150 Hz is centred with respect to the rotational axis of the unit by means of a concentric groove situated near the edge of the record. The 3 150 Hz band is played, and the output is fed to a measuring instrument, in accordance with IEC 60386.
Units without speed adjustment are measured at the actual speed: those with speed adjustment are measured at the rated speed.
Result: weighted wow and flutter = arithmetic mean of at least three meter readings.
10.2.5 Maximum start time to reach actual or rated speed
Specification: the maximum time that has elapsed between the operation of the starting device and the disk speed being increased from zero to the speed that gives a wow and flutter value which is twice the steady state value.
Method:
A test record (see Annex B) containing a signal of 3 150 Hz is played with the pickup at the beginning of the recording. The reproduced test signals shall be fed to a frequency discriminator centred on 3 150 Hz and the output from the discriminator fed to a graphic recorder or storage oscilloscope. The time taken from the operation of the starting device to when the trace on the recorder reaches twice the steady-state wow and flutter value is noted. The measurement is repeated several times.
Result: the maximum time shall be stated in s.
10.2.6 Signallrumble ratio
For all measurements in this subclause, the frequency characteristic of any correction and/or equalization network external to the unit under test shall, between 2 Hz and 2 kHz, not deviate by more than —1 dB from the rated reproducing characteristic, taking as a reference point the value at 1 kHz.
Specifications:
a) Signal/rumble ratio:
If U is the maximum voltage derived from low-frequency vibration within the unit measured at a given output, and U0 is the voltage derived from the reference signal intended for and measured at the same output:
b) Signal/rumble ratio — uriweighted:
Signal/rumble ratio when U and U0 are measured via a low-pass filter network resulting in the attenuation curve X in Figure C.1. It is a measure of the very low-frequency rumble, which is heard mainly as intermodulation with the wanted recording.
C) Signal/rumble ratio — weighted:
Signal/rumble ratio when U and U0 are measured via a weighting network resulting in the attenuation curve V in Figure C.1. It is a measure of the rumble, which is heard mainly as an independent signal.
Method: (for general use, where a simple result is required)
A test record (see Annex C) containing unmodulated grooves as well as reference signals intended for the left, right and lateral measuring planes is played. By means of a measuring instrument (see Annex C), the maximum output voltage derived from the unmodulated grooves is compared with the output voltage derived from the reference signal corresponding to the plane of measurement, both readings being taken via a network resulting in attenuation curves:
1) X in Figure C.1 for signal/rumble ratio — unweighted;
2) Y in Figure C.1 for signal/rumble ratio — weighted.
For stereo use, the signal/rumble ratios — unweighted and weighted — are determined for the left and right measuring planes. For mono use, the signal/rumble ratios — unweighted and weighted — are determined for the lateral measuring plane.
For stereo use:
• Signal/rumble ratio — unweighted = smallest of left and right signal/rumble ratios, unweighted
• Signal/rumble ratio — weighted = smallest of left and right signal/rumble ratios, weighted. For mono use:
• Signal/rumble ratio — unweighted = lateral signal/rumble ratio, unweighted.
• Signal/rumble ratio — weighted = lateral signal/rumble ratio, weighted.
10.2.7 Signal/hum ratio
Specification: if U is the maximum voltage at a given output derived from stray fields when the reproducing stylus tip is 2,5 mm above the rotating turntable, and at a distance of between 50 mm and 150 mm from its centre of rotation, and LI0 is the voltage derived from the reference signal intended for and measured at the same output.BS EN IEC 60098 pdf download.Analogue audio disk records and reproducing equipment