This standard specifies design and structural requirements of radio transmitting equipments and test methods under proper conditions.
This standard is applicable to radio transmitting equipment operated by skilled personnel, including any auxiliary apparatus necessary for its normal operation as defined in IEC 60244-1. It is applicable to all radio transmitting equipments and auxiliary apparatus, including combining units and matching network. Only the antenna system and associated feeder lines are excluded.
This standard is not applicable to transmitters of safety-insulated construction using double insulation or reinforced insulation and without provision for protective earthing. This type of equipment is designated "Class II Equipment" in GB/T 12501-1990 "Classification of Electrical and Electronic Equipment with Regard to Protection against Electric Shock" and its mark is by reference to symbol mark of B2.2 in Appendix B.
This standard has no promise the safety of non-skilled personnel working on the equipment when the equipment works abnormally.
The use of this standard is not, however, intended to be restricted to type tests. It may also be used for acceptance tests after installation of the equipment, for tests after modifications to parts of the equipment and for tests at appropriate intervals to ensure the continuing safety of the equipment throughout its life.
2 Normative References
GB 2894 Safety Signs (GB 2894-1996, idt ISO 3864: 1984)
GB/T 5465.2 Graphical Symbols for Use on Electrical Equipment (GB/T 5465. 2-2008, IEC 60417 DB: 2007, IDT)
GB/T 14366 Acoustics-Determination of Occupational Noise Exposure and Estimation of Noise-induced Hearing Impairment (GB/T 14366-1993, eqv ISO 1999: 1990)
IEC 60244-1 Methods of Measurement for Radio Transmitters. Part 1: General Characteristics for Broadcast Transmitters
3 Terms and Definitions
3.1
Skilled personnel
Personnel are considered to be skilled if they have the necessary knowledge and practical experience of electrical and radio engineering to appreciate the various hazards that can arise from working on radio transmitters, and to take appropriate precautions to ensure the safety of personnel.
Guidance on assessing the competence of personnel for designation as skilled is given in Appendix C.
Note: The above definition and the guidance in Appendix C detail the minimum requirements for a skilled person. In some countries, more stringent requirements for qualifications, training and experience are stipulated, with formal certification.
3.2
Electrically safe
A part is electrically safe if it cannot cause a harmful electric shock or radio-frequency skin burn.
3.3
Creepage distance
Denotes the shortest distance, measured in air over the surface of the insulation, between two conductive parts.
3.4
Clearance
Denotes the shortest distance, measured in air, between two conductive parts.
3.5
By hand
Denotes that the operation does not require the use of a tool, coin, or any other object.
3.6
Accessible part
A part is accessible if it can be touched by either of the standard test fingers described in GB 4208, when applied in any direction with a force not exceeding 50N.
In addition, to guard flashover, any part carrying a voltage is regarded as accessible if its distance to the test finger is less than the clearance given in Appendix A.
3.7
Enclosure
Denotes a space in which items of equipment that may be dangerous are located and access to which is prevented except by routes specially provided, for example, a door or a removable cover plate.
3.8
Safe device
Denotes any part or component provided for the purpose of protecting personnel from possible injury.
4 Conditions of Normal Use and Fault Conditions
4.1 Conditions of normal use
a) The ambient atmosphere conditions for the equipment are within the following range:
——Temperature: +5℃~+45℃;
——Relative humidity: 45%~75%;
——Air pressure: 86kPa~106kPa (kN/m2).
Or more stringent conditions agreed between manufacturer and purchaser.
b) The supply voltage and frequency are within the range for which the equipment has been designed.
c) For a.c. equipment, the waveform of the supply voltage is in accordance with Appendix F.
d) For equipment which may be operated from a.c. or d.c., either supply is applied separately.
e) The safety earth terminals or contacts, if any, are connected to earth (see 6.2.1). Any other earth terminals shall also be connected to earth, unless the terminals are designed to be tightened by hands; in which case, they are left unconnected.
f) The access doors and cover plates or other protective covers, if any, are closed or fixed in position, unless they are designed to be opened or removed by hand; in which case they are left open or removed.
g) The equipment is operating in any position for which it has been designed to be used.
h) The equipment has its accessible controls at any setting.
i) The equipment is operating with any input signal condition given in the equipment specification.
