Standard frequency
A standard frequency is either a standard frequency for acoustic measurements according to EN ISO 266 or an IEC standard frequency for technical applications according to EN 60196.
Standard frequencies for acoustic measurements according to EN ISO 266
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DIN EN ISO 266 |
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Area | Acoustics |
title | Standard frequencies |
Brief description: | Standard frequencies for acoustic measurements |
Latest edition | 1997-08 |
ISO | 266 |
Standard frequencies for acoustic measurements according to EN ISO 266 (formerly DIN standard DIN 45401) are defined frequencies at which measurements in the fields of acoustics and electroacoustics are to be carried out.
Since the frequency f = 1000 Hz is the usual center frequency in the acoustic range, the standard frequency sequence was set up and down based on f = 1000 Hz. The standard frequencies listed in the table should be used as center frequencies for octave filters and third- octave filters . The filter center frequencies of the first series are identical to the filter corner frequencies ( cutoff frequencies ) of the second series and vice versa. For measurements in octave steps, the frequency sequence containing the frequency 1000 Hz should be preferred.
Table of standard frequencies according to EN ISO 266
1st octave sequence | 31.5 | 63 | 125 | 250 | ||||||||||||||||
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2nd octave sequence | 45 | 90 | 180 | |||||||||||||||||
1st sequence of thirds | 31.5 | 40 | 50 | 63 | 80 | 100 | 125 | 160 | 200 | 250 | ||||||||||
2nd sequence of thirds | 35.5 | 45 | 56 | 71 | 90 | 112 | 140 | 180 | 224 | 280 | ||||||||||
1st octave sequence | 500 | 1000 | 2000 | |||||||||||||||||
2nd octave sequence | 355 | 710 | 1400 | 2800 | ||||||||||||||||
1st sequence of thirds | 315 | 400 | 500 | 630 | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | ||||||||||
2nd sequence of thirds | 355 | 450 | 560 | 710 | 900 | 1120 | 1400 | 1800 | 2240 | 2800 | ||||||||||
1st octave sequence | 4000 | 8000 | 16000 | |||||||||||||||||
2nd octave sequence | 5600 | 11200 | 22400 | |||||||||||||||||
1st sequence of thirds | 3150 | 4000 | 5000 | 6300 | 8000 | 10,000 | 12500 | 16000 | 20000 | 25,000 | ||||||||||
2nd sequence of thirds | 3550 | 4500 | 5600 | 7100 | 9000 | 11200 | 14000 | 18000 |
IEC standard frequencies
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DIN EN 60196 |
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Area | Electrical engineering |
title | IEC standard frequencies |
Brief description: | Standard frequencies for single-phase AC and three-phase systems, for systems on ships, for rail systems, for tools and for aircraft |
Latest edition | 2010-03 |
ISO | - |
IEC standard frequencies are those frequencies (up to 10,000 Hz) that are to be used for single-phase AC and three-phase systems, for systems on ships, for rail systems operated with AC, for tools and for aircraft.
For energy supply and systems on ships, 50 Hz and 60 Hz are the standard frequencies.
For railways, 16⅔ Hz, 50 Hz and 60 Hz are the standard frequencies.
For tools, the standard frequencies are divided into series I, 50 Hz and series II, 60 Hz. The entries marked in bold in row I are preferred values.
Row I. | 50 | 100 | 150 | 200 | 250 | 300 | 400 | 500 | 600 | 750 | |
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I ff | 1,000 | 1,200 | 1,500 | 2,000 | 2,400 | 3,000 | 4,000 | 8,000 | 10,000 | ||
Row II | 60 | 180 | 400 | 540 | 720 | ||||||
II ff | 1,000 | 1,440 | 2,160 | 2,800 | 3,420 |
400 Hz is the standard frequency for aircraft.
Norms
- DIN 45401: 1985-02 Acoustics, electroacoustics, standard frequencies for measurements; withdrawn, document was replaced by: DIN EN ISO 266: 1997-08
- EN ISO 266: 1997 Acoustics - Standard frequencies (ISO 266: 1997)
- EN 60196: 2009 (VDE 0175-3: 2010-03) IEC standard frequencies
- EN 50163: 2004 (VDE 0115-102: 2005-07) Railway applications - Supply voltages for railway networks.
Individual evidence
- ↑ For traction current primarily EN 50163 (VDE 0115-102): 2005-07 Railway applications supply voltages of railway networks and DIN EN 50163 / A1 VDE 0115-102 / A1: 2008-02. The traction current was definitely switched from 16 2/3 to 16.7 Hz on October 16, 1995 (simultaneous switchover in Switzerland, Austria and Germany).