(Cap 106, section 37) [9 September 1966] (L.N. 65 of 1966) Cap 106B reg 1 Citation These regulations may be cited as the Telecommunications (Control of Interference) Regulations. (36 of 2000 s. 28) Cap 106B reg 1A Interpretation In these regulations- "information technology equipment" (资讯技术设备) means equipment designed for the purpose of- (a) receiving data from an external source (such as a data input line or via a keyboard); (b) performing certain processing functions on the received data (such as computation, data transformation or recording, filing, sorting, storage or transfer of data); or (c) providing a data output (either to other equipment or by the reproduction of data or images); "interference" (干扰) means the effect of unwanted energy due to any or a combination of emission, radiation or induction upon reception in a telecommunications system, manifested by any performance degradation, misinterpretation or loss of information which could be extracted in the absence of such unwanted energy. (36 of 2000 s. 28) (L.N. 153 of 1993) Cap 106B reg 2 Application of regulations and classification of apparatus (1) Subject to the provisions of paragraph (3), these regulations shall apply to every apparatus belonging to any of the following classes of apparatus for or in respect of which limits of interference or insertion loss are specified in Schedule 1- (L.N. 153 of 1993) (a) ignition apparatus of internal combustion engines; (b) information technology equipment; (L.N. 153 of 1993) (c) sound and television broadcast receivers and associated equipment; (L.N. 153 of 1993) (d) fluorescent lamps and luminaires; (L.N. 153 of 1993) (e) (i) household electrical appliances and similar electrical apparatus; (ii) portable tools. (L.N. 153 of 1993) (f)-(g) (Repealed L.N. 153 of 1993) (2) (Repealed L.N. 153 of 1993) (3) (a) Any apparatus in an aircraft or in a vessel registered outside Hong Kong shall, for the purposes of regulation 4, be deemed not to be within any of the classes specified in paragraph (1), and references in these regulations to the ignition apparatus of an internal combustion engine shall not be construed as referring to the ignition apparatus of an internal combustion engine in an aircraft or in a vessel registered outside Hong Kong. (23 of 1998 s. 2) (b) For the purposes of regulation 3 any apparatus (other than the ignition apparatus of an internal combustion engine) designed to be used exclusively in a vessel or aircraft and to obtain its power solely therefrom, and for the purposes of regulation 4 any apparatus (other than the ignition apparatus of an internal combustion engine) used in a vessel or aircraft and obtaining its power solely therefrom, shall be deemed not to be within any of the classes specified in paragraph (1). (c) For the purposes of regulations 3 and 4, an apparatus for radiocommunications or an apparatus of any kind that generates and emits radio waves shall be deemed not to be within any of the classes specified in paragraph (1) if a licence is required for its possession or use under section 8 of the Ordinance or if the possession or use of such apparatus without a licence is permitted pursuant to an order under section 39 of the Ordinance. (L.N. 153 of 1993; 36 of 2000 s. 28) Cap 106B reg 3 Manufactures, assemblers and importers (1) The requirement referred to in regulation 7 shall be complied with in the case of every apparatus to which these regulations apply (whether manufactured, assembled or imported before or after the day on which these regulations are published in the Gazette) if that apparatus is to be sold otherwise than for export, or offered or advertised for sale otherwise than for export, or let on hire or offered or advertised for letting on hire, or installed, by any person, whether on his own account or as agent of some other person, who in Hong Kong or whose principal in Hong Kong in the course of business manufactured or assembled the apparatus or who on his own account or as agent in the course of business imported the apparatus into Hong Kong or whose principal in the course of business imported the apparatus into Hong Kong. (L.N. 153 of 1993) (2) Any person, whether on his own account or as agent of some other person, who- (L.N. 153 of 1993) (a) sells otherwise than for export or offers or advertises for sale otherwise than for export; or (b) lets on hire or offers or advertises for letting on hire; or (c) installs, any apparatus to which these regulations apply (whether manufactured, assembled or imported before or after the day on which these regulations are published in the Gazette), being an apparatus which was manufactured or assembled by him or his principal, as the case may be, in Hong Kong in the course of business or imported into Hong Kong by him, whether on his own account or as agent of some other person, or by his principal, in the course of business, shall, if such apparatus does not comply with the requirement referred to in regulation 7 when so sold, offered or advertised for sale, let on hire, offered or advertised for letting on hire, or installed, as the case may be, be guilty of an offence and shall be liable on summary conviction, in the case of the first such offence, to a fine of $5000 and, in the case of any subsequent such offence, to a fine of $10000; and where such person is the agent of some other person, such other person shall be under the same liability as if he had himself sold or offered or advertised for sale, or let on hire or offered or advertised for letting on hire, or installed, that apparatus, as the case may be. (L.N. 256 of 1994) Cap 106B reg 4 Users (1) The requirement referred to in regulation 7 shall be complied with in the case of every apparatus to which these regulations apply, whether manufactured, assembled, installed, imported, purchased, hired or otherwise obtained before or after the day on which these regulations are published in the Gazette, if such apparatus is to be used in Hong Kong: (L.N. 256 of 1994) Provided that in the case of the ignition apparatus of an internal combustion engine the use of the apparatus shall be deemed to comply with the said requirement if the person using the apparatus establishes- (a) that suppressors were fitted to the apparatus by the manufacturer, assembler or importer of the vehicle, vessel or engine of which the apparatus forms part; and (b) that the suppressors so fitted remained fitted to the apparatus at the time of use, or that suppressors having the same electrical characteristics had been correctly fitted to the apparatus at that time in substitution for those fitted as aforesaid, and in either case that the suppressors were then in good electrical and mechanical repair and condition; and (c) that the apparatus at the time of the use consisted of the same components as those which were fitted at the time when the vehicle, vessel or engine of which the apparatus forms part was manufactured or assembled, or that any components which had been substituted for those components had the same electrical characteristics and had been correctly fitted. (2) Save as provided in paragraph (3) and in regulation 9, it shall not be unlawful for any person to use any apparatus to which these regulations apply by reason only that it does not comply with the requirement referred to in regulation 7, but the non-compliance therewith shall be a ground for the giving of a notice under regulation 5. (3) Any person who uses any internal combustion engine the ignition apparatus of which does not comply with the requirement referred to in regulation 7 shall be guilty of an offence and shall be liable on summary conviction, in the case of the first such offence, to a fine of $1000 and, in the case of any subsequent such offence, to a fine of $5000. (L.N. 153 of 1993; L.N. 256 of 1994) Cap 106B reg 5 Enforcement of regulations as to use (1) If the Authority is of the opinion- (a) that any apparatus to which regulation 4 applies does not comply with the requirement referred to in regulation 7; and either (b) that the use of the apparatus is likely to cause undue interference with the working of any apparatus for telecommunications used for the purpose of any safety of life service or for any purpose on which the safety of any person or of any vessel, aircraft or vehicle may depend; or (36 of 2000 s. 28) (c) that the use of the apparatus is likely to cause undue interference with the working of any other apparatus for telecommunications and in fact has caused or is causing such interference in a case where he considers that all reasonable steps to minimize interference have been taken in relation to the station or apparatus receiving the telecommunications, he may serve on the person in whose possession the apparatus is a notice in writing requiring that, after a date fixed by the notice, not being less than fourteen days from the date of service thereof, the apparatus shall not be used, whether by the person to whom the notice is given or otherwise, or, if the Authority thinks fit so to frame the notice, shall only be used in such manner, at such time and in such circumstances as may be specified in the notice: (36 of 2000 s. 28) Provided that if the Authority is satisfied that the use of the apparatus concerned is likely to cause undue interference such as is referred to in sub-paragraph (b), the date fixed by the notice may, in the discretion of the Authority, be the date of service of the notice or any other date earlier than fourteen days from the date of service. (2) If the Authority is satisfied that the use of any apparatus to which regulation 4 applies is likely to cause undue interference such as is referred to in paragraph (1)(b) and that the circumstances of the case warrant the service of a notice under that paragraph requiring that the apparatus shall not be used from the date of service of the notice, he may, in addition to the service of such a notice and either before or after the service of the notice, seal the apparatus in such manner, or remove such part thereof, as ensures that the apparatus is not used, but in such a case, where the apparatus is sealed or a part thereof is removed before the service of the notice, the notice aforesaid shall be served within three days after the apparatus is sealed or the part removed therefrom. (3) A notice under paragraph (1) may be revoked or varied by a subsequent notice in writing by the Authority served on the person in whose possession the apparatus then is: Provided that- (a) where a notice under this paragraph has the effect of imposing any additional restrictions on the use of the apparatus, the provisions of paragraph (1) relating to the coming into force of notices shall apply in relation to the notice as if it had been a notice served under that paragraph; and (b) where the Authority is satisfied that the apparatus has been altered or otherwise made to comply with the requirement referred to in regulation 7, he shall revoke the notice and forthwith break the seal (if any) on, or replace the part (if any) removed from, the apparatus. (4) No person, being a person who knows that a notice of the Authority under this regulation is in force with respect to any apparatus, shall use that apparatus, or cause or permit it to be used, in contravention of the notice. (5) Any person who contravenes the provisions of paragraph (4) shall be guilty of an offence and shall be liable on summary conviction- (a) where the apparatus with respect to which the notice was given was sealed or a part of it was removed under and in accordance with paragraph (2), for the first such offence under this sub-paragraph, to a fine of $10000 and to imprisonment for 3 months, and, for any subsequent such offence under this sub-paragraph to a fine of $20000 and to imprisonment for 6 months; and (b) in any other case, for the first such offence under this sub-paragraph, to a fine of $5000, and, for any subsequent such offence under this sub-paragraph, to a fine of $10000: Provided that no person shall be convicted of an offence under this paragraph if it is made to appear to the court that at the time of the use of the apparatus in contravention of the notice an application had been made in writing to the Authority for revocation of the notice and that the Authority had, without reasonable cause (the burden of proof whereof shall be upon the Authority), failed or neglected to revoke the notice within a reasonable time after receipt of the application for revocation. (L.N. 256 of 1994) Cap 106B reg 6 Entry and search of premises, etc. Where a magistrate is satisfied by information on oath- (a) that there is reasonable ground for believing that, on any specified premises or in any specified vessel, aircraft or vehicle, apparatus to which these regulations apply is to be found which does not comply with the requirement applicable to it under these regulations; and (b) that it is necessary to enter those premises, or that vessel, aircraft or vehicle, and to examine or test any apparatus to which these regulations apply which may be found therein or thereon for the purpose of determining whether any such apparatus does or does not comply with the requirement applicable to it under these regulations; and (c) that, within fourteen days before the date of the application to such magistrate, access to the premises, vessel, aircraft or vehicle for the purpose aforesaid has been demanded by, or permission to examine any such apparatus as aforesaid which has been found therein or thereon has been requested by, the Authority or any public officer authorized in writing in that behalf by the Authority and producing sufficient documentary evidence of his identity and, in the case of a public officer authorized as aforesaid, of his authority, but in either case has been unreasonably refused, the magistrate may issue his warrant empowering the Authority or any public officer or officers authorized in writing in that behalf by the Authority and named in such authorization to enter the premises or, as the case may be, the vessel, aircraft or vehicle and any premises on which it may be and to search the premises, vessel, aircraft or vehicle with a view to discovering whether any apparatus to which these regulations apply is situate thereon or therein, and, if he finds or they find any such apparatus thereon or therein, to examine and test it with a view to determine whether it does or does not comply with the requirement applicable to it under these regulations. Cap 106B reg 7 Requirement (1) The requirement referred to in regulations 3 and 4 is that the apparatus shall be so designed, constructed, assembled and installed, and that such precautions shall be taken in relation to it (by means of the fitting of suppressors or otherwise), as to ensure that when that apparatus is used, at any frequency within the defined frequency range- (a) the interference voltage at the electric supply line or aerial terminals of the apparatus does not exceed the limit of interference voltage specified in Schedule 1 for that frequency range; (b) the interference field strength or interference power (where applicable) of the electromagnetic energy radiated in any direction from the apparatus or its associated cables does not exceed the limit of interference field strength or interference power specified in Schedule 1, for that frequency range and at any distance not less than the given distance for the same frequency range; or (c) the insertion loss (where applicable) of any interference suppression device fitted into the apparatus does not fall below the minimum value specified in Schedule 1 for that frequency range, in respect of the class or subdivision of the class of apparatus (as the case may be) to which the apparatus concerned belongs. (2) In paragraph (1)- (a) "defined frequency range" (已界定的频率范围) means, in relation to any apparatus belonging to a class or subdivision of a class of apparatus referred to in Schedule 1, the frequency range or, where there is more than one, any of the frequency ranges specified in respect of such class or subdivision in the column headed "Frequency Range"; (b) "given distance" (给定距离) means, in relation to any apparatus belonging to a class or subdivision of a class of apparatus referred to in Schedule 1, the distance specified in that Schedule for the limit of interference field strength in respect of such class or subdivision and for the relevant frequency range. (3) The requirement in paragraph (1) shall be deemed to be complied with for the purposes of regulations 3 and 4, in the case of a sale, offer or advertisement for sale, letting on hire, offer or advertisement for letting on hire or use of a fluorescent lamp or luminaire, if the person selling, offering or advertising for sale, letting on hire, offering or advertising for letting on hire or using, as the case may be, the apparatus, establishes- (a) that suppressors were fitted to the apparatus by the manufacturer, assembler or importer; (b) that the suppressors so fitted remained fitted to the apparatus at the time of the sale, letting on hire, offer or advertisement for letting on hire or use, as the case may be, or that suppressors having the same electrical characteristics had been correctly fitted to the apparatus at that time in substitution for those fitted as aforesaid, and in either case that the suppressors were then in good electrical and mechanical repair and condition; and (c) that the apparatus at the time of the sale, offer or advertisement for sale, letting on hire, offer or advertisement for letting on hire or use, as the case may be, consisted of the same components as those which were fitted at the time when the apparatus was manufactured or assembled, or that any components which had been substituted for those components had the same electrical characteristics and had been correctly fitted. (L.N. 153 of 1993) Cap 106B reg 7A Transitional (1) During the period of 12 months beginning on the date of commencement of the Telecommunication (Control of Interference) (Amendment) Regulation 1993 (L.N. 153 of 1993), the requirement referred to in regulation 7 shall be deemed to be complied with in respect of any apparatus, if the apparatus concerned is so designed, constructed, assembled and installed, and that such precautions are taken in relation to it (by means of the fitting of suppressors of otherwise), as to ensure that when the apparatus is used, at any frequency within the defined frequency range- (a) the interference voltage (where applicable) at the electric supply line terminals of the apparatus does not exceed the limit of interference voltage specified in Schedule 2 for that frequency range; or (b) the interference field strength (where applicable) of the electromagnetic energy radiated in any direction from the apparatus does not exceed the limit of interference field strength specified in Schedule 2 for that frequency range at any distance not less than the given distance for the same frequency range, in respect of the class or subdivision of the class of apparatus to which the apparatus concerned belongs. (2) In paragraph (1)- (a) "defined frequency range" (已界定的频率范围) means, in relation to any apparatus belonging to a class or subdivision of a class of apparatus referred to in Schedule 2, the frequency range or, where there is more than one, any of the frequency ranges specified in respect of such class or subdivision in the column headed "Frequency Range" in that Schedule; (b) "given distance" (给定距离) means, in relation to any apparatus belonging to a class or subdivision of a class of apparatus referred to in Schedule 2, the distance specified in that Schedule for the limit of interference field strength in respect of such class or subdivision and for the relevant frequency range. (L.N. 153 of 1993) Cap 106B reg 8 Measurement and computation of noise voltage and field-strength For the purposes of these regulations and the measurement and computation of interference voltage, interference field strength, interference power and insertion loss- (L.N. 153 of 1993) (a) the Authority shall be the sole authority by which measurements are made; (b) the Authority shall determine the measuring apparatus to be used, the method by which and conditions under which tests are to be made and the manner to be used in computing interference voltage, interference field strength, interference power and insertion loss from readings afforded by the measuring apparatus; and shall supply to any person applying therefor, information as to any of the matters referred to in this paragraph; and (L.N. 153 of 1993) (c) the Authority may use methods of statistical sampling recommended by the International Special Committee on Radio Interference, in connection with testing or examining mass produced apparatus for the purpose of determining whether the apparatus being investigated complies with the requirements of regulation 7. (L.N. 153 of 1993) Cap 106B reg 9 Deliberate interference (1) Any person who uses any apparatus for the purpose of interfering with the working of any apparatus for telecommunications shall be guilty of an offence and shall be liable on summary conviction to a fine of $20000 and to imprisonment for 12 months. (L.N. 256 of 1994; 36 of 2000 s. 28) (2) This regulation shall apply whether or not the apparatus is an apparatus within any class specified in regulation 2, and, if within any such class, whether or not it complies with the requirement referred to in regulation 7, and whether or not any notice under regulation 5 has been given with respect to it or, if given, has been varied or revoked. Cap 106B reg 10 Amendment of Schedule (1) Subject to the provisions of paragraph (2), the Authority may from time to time, by order published in the Gazette, amend the particulars specified in Schedule 1, or insert new particulars therein, in respect of any class of apparatus specified in regulation 2(1). (L.N. 153 of 1993) (2) No order shall be made under paragraph (1) without the prior approval of the Governor in Council if the effect of such order would be to impose, for or in respect of any class of apparatus, a limit of interference in respect of which no recommendation has been made by, or a limit of interference which would tolerate less interference than the tolerable limits indicated by the recommendation of, the International Special Committee on Radio Interference (Comite international special des perturbations radio-electriques) for or in respect of such class. (3) For the purpose of regulation 3 (but not for the purpose of any other provision of these regulations unless so provided in the order), an order made under this regulation shall not come into operation before the expiry of a period of six months, or such longer period as may be specified therein, from the date of publication of the order in the Gazette. Cap 106B Sched 1 LIMITS OF INTERFERENCE VOLTAGE, INTERFERENCE FIELD STRENGTH, INTERFERENCE POWER, OR INSERTION LOSS FOR THE PURPOSES OF REGULATION 7 [regulations 2, 7 & 10] PART I IGNITION APPARATUS OF INTERNAL COMBUSTION ENGINES Limits of radiated interference based on quasi-peak measurements in the frequency range 30 MHz to 1000 MHz, measured at a distance of 10 m. Frequency Range (MHz) Field Strength Limit (Quasi-peak) (dBμV/m) 30-75 75-400 400-1000 34 34-45 [1] 45 Note: [1] The limit increases linearly with the logarithm of the frequency. PART II INFORMATION TECHNOLOGY EQUIPMENT 1. Limits of mains terminal interference voltage in the frequency range 0.15 MHz to 30 MHz for class A equipment*. Frequency Range (MHz) Interference Voltage Limit (dBμV) [1] Quasi-peak Average 0.15 to 0.5 0.5 to 30 79 73 66 60 Note: [1] The lower limit shall apply at the transition frequency. 2. Limits of mains terminal interference voltage in the frequency range 0.15 MHz to 30 MHz for class B equipment**. Frequency Range (MHz) Interference Voltage Limit (dBμV) [2] Quasi-peak Average 0.15 to 0.5 0.5 to 5 5 to 30 66 to 56 (3) 56 60 56 to 46 [3] 46 50 Note: [2] The lower limit shall apply at the transition frequency. [3] The limit decreases linearly with the logarithm of the frequency. 3. Limits of radiated interference field strength in the frequency range 30 MHz to 1000 MHz at a test distance of 30 m for class A equipment*. Frequency Range (MHz) Field Strength Limit (Quasi-peak) (dBμV/m)(4) 30 to 230 230 to 1000 30 37Note: [4] The lower limit shall apply at the transition frequency. 4. Limits of radiated interference field strength in the frequency range 30 MHz to 1000 MHz at a test distance of 10 m for class B equipment**. Frequency Range (MHz) Field Strength Limit (Quasi-peak) (dBμV/m)[5] 30 to 230 230 to 1000 30 37 Note: [5] The lower limit shall apply at the transition frequency. * Equipment used or located in commercial/non-residential premises.** ** Equipment used or located in domestic/residential premises. PART III SOUND AND TELEVISION BROADCAST RECEIVERS AND ASSOCIATED EQUIPMENT Limits of conducted interference and radiated interference. 1. Limits of interference voltage injected into the mains: Equipment Type Frequency Range (MHz) Interference Voltage Limit (dBμV) [1][2] Quasi-peak [3] Average [3] Sound and television receivers and associated equipment [5] 0.15-0.5 0.5-5 5-30 66-56 [4] 56 60 56-46 [4] 46 50Note: [1] The higher value measured with and without the aerial input outer conductor screen connected to earth is considered. [2] At the transition frequency, the lower limit applies. [3] If the limits for the average detector are met when using the quasi-peak detector, then the limits for the measurements with the average detector are considered to be met. [4] Limits decreasing linearly with the logarithm of the frequency. [5] Television receivers with teletext facilities should be tested in teletext mode with teletext picture. 2. Limits of radiated interference due to the local oscillator at its fundamental and harmonic frequencies and due to all other sources at a distance of 3 m: Equipment Type Source Frequency (MHz) Field Strength Limit (dBμV/m) [6] Quasi-peak Television receivers and video recorders Local oscillator Other 300-1000 121.5 243 Fundamental 56 [7] Harmonics 56 40 47 Frequency modulation sound receivers [8] Local oscillator 30-300 300-1000 Fundamental 60 Harmonics 52 Harmonics 56 Note: [6] At the transition frequency, the lower limit applies. [7] If a standard intermediate frequency is used, the limit at the local oscillator fundamental frequency of television receivers and video recorders can be relaxed to 70. [8] For car radio receivers no radiation limits apply. 3. Limits of interference voltage at the aerial terminals: Equipment Type Source Frequency (MHz) Interference Voltage Limit [9][10] (dBμV) 75 Ω Quasi-peak Television receivers and video recorders working in channels between 30MHz and 1 GHz Local oscillator Other 30-950 950-1750 30-1750 Fundamental 46 Harmonics 46 Harmonics 54 [11] 46 Television receivers for broadcast satellite transmission: tuner units at 1st IF [12] Local oscillator Other 30-950 950-1750 30-1750 Fundamental 46 Fundamental 54 [11] 46 Frequency modulation sound receivers Local oscillator Other 30-300 300-1000 30-1000 Fundamental 54 Harmonics 50 Harmonics 52 46 Frequency modulation car radios Local oscillator 30-300 300-1000 Fundamental 66 Harmonics 59 Harmonics 52 Note: [9] The interference voltage limits for receivers with nominal impedance other than 75 Ω are calculated according to the following formula: Lz = L75 + 10 log (Z/75) dBμV where Z = nominal impedance in Ω L75 = interference voltage limit for 75 Ω nominal impedance Lz = interference voltage limit for Z nominal impedance [10] At the transition frequency, the lower limit applies. [11] The value of 54 dBμV is intended to be reduced to 46 dBμV. [12] "1st IF" stands for "first intermediate frequency". For tuner units, "aerial terminals" (天线接线端子) means "1st IF input terminals". PART IV FLUORESCENT LAMPS AND LUMINAIRES 1. Minimum value of insertion loss of luminaires with or without starters designed for the following types of fluorescent lamps: (a) linear fluorescent lamps with a nominal diameter of 15 mm, 25 mm or 38 mm; (b) circular fluorescent lamps with a nominal diameter of 28 mm or 32 mm; (c) U-type fluorescent lamps with a nominal diameter of 15 mm, 25 mm or 38 mm; (d) single-capped fluorescent lamps, without integrated starter and with a nominal diameter of 15 mm. Frequency (kHz) 160 240 550 1000 1400 Minimum values of insertion loss (dB) 28 26 24 22 20 2. Mains terminal interference voltages for all types of luminaires for which the insertion loss limits do not apply shall comply with the mains terminal voltage limits as shown in the table below. These limits shall also apply to self-ballasted fluorescent lamps. Frequency Range Interference Voltage Limit [4] (dBμV) Quasi-peak Average [2] 9 kHz-50 kHz [3] 50 kHz-150 kHz [3] 150 kHz-0.5 MHz 0.5 MHz-5 MHz 5 MHz-30 MHz 110 90-80 [1] 66-56 [3] 56 60 56-46 [3] 46 50Note: [1] The limit decreases linearly with the logarithm of the frequency in the ranges 50 kHz to 150 kHz and 150 kHz to 0.5 MHz. [2] If it is certain that only broadband interference sources are present, then the average measurements need not be made. [3] The limit values in the frequency range may be modified at a later date. [4] At the transition frequencies, the lower limit applies. PART V HOUSEHOLD ELECTRICAL APPLIANCES, SIMILAR ELECTRICAL APPARATUS AND PORTABLE TOOLS Limits of radio interference in the range 0.15 MHz to 300 MHz. 1. Continuous conducted interference Limits of continuous conducted interference voltage for the frequency range 0.15 MHz to 30 MHz. (a) Household electrical appliances and electrical apparatus causing similar interference: Frequency Range (MHz) Interference Voltage Limit (dBμV)[1] Quasi-peak Average* 0.15-0.5 66-56 [2] 59-46 [2] 0.5-5 56 46 5-30 60 50Note: [1] At the transition frequency, the lower limit applies. [2] The voltage limit decreases linearly with the logarithm of the freguency. (b) Electrical apparatus with regulating controls incorporating semi-conductor devices: Frequency Range (MHz) Interference Voltage Limit (dBμV) [3] At mains terminals At load terminals and at additional terminals Quasi-peak Average* Quasi-peak Average* 0.15-0.5 66-56 [4] 56-46 [4] 80 70 0.5-5 56 46 74 64 5-30 60 50 74 64Note: [3] At the transition frequency, the lower limit applies. [4] The voltage limit decreases linearly with the logarithm of the frequency. (c) Portable tools (i) with rated power of motor** not exceeding 700 W: Frequency Range (MHz) Interference Voltage Limit (dBμV) [5] Quasi-peak Average* 0.15-0.35 66-59 [6] 59-49 [6] 0.35-5 59 49 5-30 64 54 (ii) with rated power of motor** above 700 W and not exceeding 1000 W: Frequency Range (MHz) Interference Voltage Limit (dBμV) [5] Quasi-peak Average* 0.15-0.35 70-63 [6] 63-53 [6] 0.35-5 63 53 5-30 68 58 (iii) with rated power of motor** above 1000 W: Frequency Range (MHz) Interference Voltage Limit (dBμV) [5] Quasi-peak Average* 0.15-0.35 76-69 [6] 69-59 [6] 0.35-5 69 59 5-30 74 64 Note: [5] At the transition frequency, the lower limit applies. [6] The voltage limit decreases linearly with the logarithm of the frequency. 2. Continuous radiated interference Interference power limits for the frequency range 30 MHz to 300 MHz: (a) Household appliances and similar apparatus: Frequency Range (MHz) Interference Voltage Limit (dBμV) Quasi-peak Average* 30-300 45-55 [7] 35-45 [7] Note: [7] The power limit increases linearly with the logarithm of the frequency. (b) Portable tools (i) with rated mains power** up to and including 700 W: Frequency Range (MHz) Interference Voltage Limit (dBμV) Quasi-peak Average* 30-300 45-55 [8] 35-45 [8] (ii) with rated mains power** above 700 W up to and including 1000 W: Frequency Range (MHz) Interference Voltage Limit (dBμV) Quasi-peak Average* 30-300 49-59 [8] 39-49 [8] (iii) with rated mains power** above 1000 W: Frequency Range (MHz) Interference Voltage Limit (dBμV) Quasi-peak Average* 30-300 55-65 [8] 45-55 [8] Note: [8] The power limit increases linearly with the logarithm of the frequency. * If the average limit is met when using a quasi-peak detector receiver, the test unit shall be deemed to meet both limits and measurement with the average detector receiver need not be carried out. ** The power of any heating device is to be excluded. 3. Discontinuous interference The limits for continuous conducted interference specified in paragraph 1, as increased by the following amount, apply- (a) 44 dB (for N (Note 1) < 0.2); (b) 20 log 10 30/N dB (for 0.2 ≦ N ≦ 30); (c) 0 dB (for N > 30). Note- 1. N is the click rate determined from the formula N = n/T, T being 120 minutes or the observation time in minutes, whichever is less to produce 40 clicks (Note 2), and n being the number of clicks registered during the observation time. 2. A click is defined as a disturbance which- (a) exceeds the maximum limit specified in paragraph 1; (b) lasts not more than 200 ms; and (c) is separated from a subsequent disturbance by at least 200 ms. 3. The apparatus under test shall be deemed to comply with the maximum limit if not more than a quarter of the number of clicks registered during the observation time exceed such limit. (L.N. 153 of 1993) Cap 106B Sched 2 LIMITS OF INTERFERENCE VOLTAGE OR RADIATED INTERFERENCE FIELD FOR THE PURPOSES OF REGULATION 7A* [regulation 7A] * Applicable only during the period of 1 year beginning on the commencement of the Telecommunication (Control of Interference) (Amendment) Regulation 1993 (L.N. 153 of 1993). PART I IGNITION APPARATUS OF INTERNAL COMBUSTION ENGINES Limits of radiated interference based on quasi-peak measurement measured at a distance of 10 m. Frequency Range (MHz) Field Strength Limit (μV/m) 0.2-30 30-220 100 100 PART II SOUND AND TELEVISION BROADCAST RECEIVERS Limits of conducted interference and radiated interference. 1. Conducted interference (a) AM sound broadcast receivers interference voltage injected into the mains Frequency Range (MHz) Interference Voltage Limit (μV) 0.2-1.605 1500 (b) FM sound broadcast receivers and television broadcast receivers (local oscillator voltage at main terminals) Frequency Range (MHz) Interference Voltage Limit (μV) 30-220 500 (c) Television broadcast receivers interference voltage injected into the mains (time-base terminal voltage) Frequency Range (MHz) Interference Voltage Limit (μV) 0.2-0.55 over 0.55-1.605 200 100 2. Radiated interference (a) FM sound broadcast receivers and television broadcast receivers (local oscillator field) Frequency Range (MHz) Field Strength Limit at a distance of 3 m (μV/m) 30-100 over 100-220 300 500 (b) Television broadcast receivers (time-base field) Frequency Range (MHz) Field Strength Limit at a distance of 3 m (μV/m) 0.2-1.605 100 PART III EQUIPMENT BELONGING TO ANY CLASS OF APPARATUS SPECIFIED IN REGULATION 2(1)(b), (d) OR (e) Limits of conducted interference and radiated interference. 1. Conducted interference Frequency Range (MHz) Interference Voltage Limit (μV) 0.2-1.605 over 30-220 1500 750 2. Radiated interference Frequency Range (MHz) Field Strength Limit at a distance of 3 m (μV/m) 0.2-30 over 30-220 100 50 PART IV EQUIPMENT, OTHER THAN EQUIPMENT BELONGING TO ANY CLASS REFERRED TO IN PART I, II, III, THAT IS NOT CONNECTED TO A DISTRIBUTION SYSTEM (配电系统)* * "Distribution System" means any system for conveying electrical energy from one place to another. Limits of radiated interference. Frequency Range (MHz) Field Strength Limit at a distance of 3 m (μV/m) 0.2-30 over 30-220 100 50 (L.N. 153 of 1993)
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