BS EN IEC 60098:2020 pdf download – Analogue audio disk records and reproducing equipment
10.1.2 Environment
The following information shall be provided:
a) ambient temperature (preferred range: 20 °C to 25 °C);
b) relative humidity (preferred range: 45 % to 75 %);
c) air pressure (preferred range: 86 kPa to 1 06 kPa);
d) stabilization time of unit after switching on from ambient temperature in min (preferred maximum 30 min).
10.1.3 Electric power supply
For information and marking requirements, refer to the applicable IEC safety standard, usually IEC 62368-1 .
10.1.4 Pickup operation
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 kΩ 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.
10.1.5 Test
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.
10.2 Methods of measurement
10.2.1 General 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.
1 0.2.2 Maximum apparent power consumption 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 × V R ) VA, where V R is the rated voltage.
NOTE In addition, the above measurements can be made at maximum voltage and maximum mechanical load conditions.
10.2.3 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 f Hz.
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 n, f and N are given in Table 3.
NOTE This formula is valid only for small deviations. Large values of deviation are not expected to occur.
10.2.4 Wow and flutter
Specification: see IEC 60386 for full details.