SIST EN 300 676 V1.3.1:2003
(Main)Electromagnetic compatibility and Radio spectrum Matters (ERM); Ground-based VHF hand-held, mobile and fixed radio transmitters, receivers and transceivers for the VHF aeronautical mobile service using amplitude modulation; Part 1:Technical characteristics and methods of measurement
- Abstract
Several minor technical modifications and some textural changes are necessary in the light of practical experience.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 300 676 V1.3.1:2003 is the Slovenian standard identical to EN 300 676 Version 1.3.1 from ETSI. It specifies the technical characteristics, minimum performance requirements and methods of measurement for ground-based VHF hand-held, mobile and fixed radio transmitters, receivers and transceivers used in the aeronautical mobile service with amplitude modulation. It is written for equipment assessment, type testing and verification of radio performance in practice.
What does SIST EN 300 676 V1.3.1:2003 specify?
SIST EN 300 676 V1.3.1:2003 sets minimum requirements for ground-based aeronautical VHF radio equipment operating in the 118 MHz to 136,975 MHz band. It applies to Double Side Band Amplitude Modulation (DSB AM) systems with 8,33 kHz or 25 kHz channel spacing, including analogue speech equipment and 25 kHz ground base stations used for ACARS data communication.
The document is organized into clauses on scope, references, definitions, general requirements, test conditions, measurement conditions, transmitter tests, receiver tests, and measurement uncertainty.
| Annex | What it covers |
|---|---|
| Annex A | Auxiliary cables and how to arrange them for repeatable measurements |
| Annex B | Specification for adjacent channel power measurement arrangements |
| Annex C | Bibliography |
What are the key requirements of SIST EN 300 676 V1.3.1:2003?
SIST EN 300 676 V1.3.1:2003 requires equipment to operate on the relevant ICAO channels for 8,33 kHz systems and across 118,0 MHz to 136,975 MHz for 25 kHz systems. It also requires that transmission be blocked while the frequency synthesizer is out of lock or while channel switching is in progress, which prevents spurious operation during tuning.
General design and test conditions
Clause 4 requires at least three visible/user-facing functions: power-on indication, a way to disable squelch for test purposes, and a carrier-on indication. It also limits user access to controls that could degrade performance if set incorrectly, which matters because compliance depends on stable, protected settings.
Clause 4 also defines the emission types: full-carrier DSB AM for speech and 13k0A2D for data. Clause 4.3 requires the equipment to meet the standard within one minute after switch-on under normal conditions, with a 30-minute warm-up allowed for heated parts such as crystal ovens.
Test conditions and channels
Clause 5 defines the normal and extreme test environments. Measurements are made at normal room conditions and, where required, at extreme temperatures, extreme supply voltages and extended temperatures. Clause 6 then standardizes the measurement setup, including 50 Ω terminations, disabled squelch unless stated otherwise, and three test channels at 118,000 MHz, 127,500 MHz and 136,975 MHz.
Transmitter requirements
Clause 7 checks transmitter protection, frequency error, carrier power, modulation quality, adjacent channel power, broadband noise, conducted spurious emissions, intermodulation attenuation, RF power attack and release times, and keying transients. In practice, this means the transmitter must stay on frequency, deliver its rated power, modulate correctly, and avoid unwanted emissions that could interfere with nearby aviation channels.
Several transmitter limits are set separately for 8,33 kHz and 25 kHz equipment, and for fixed base, mobile/portable and hand-held categories. The modulation tests cover speech and data modes, including modulation depth, compression, distortion and audio frequency response.
Receiver requirements
Clause 8 tests receiver sensitivity, harmonic distortion, audio frequency response, audio noise, effective acceptance bandwidth, adjacent channel rejection, spurious response rejection, intermodulation response rejection, blocking, conducted spurious emissions, squelch operation, cross modulation rejection, receiver dynamic range, AGC timing and AF AGC. These tests matter because they show whether the receiver can hear weak wanted signals while rejecting nearby or interfering signals.
The receiver section also includes data-mode checks such as AGC attack and decay time and group delay variation, which are important for stable data reception and timing.
Measurement quality
Clause 9 requires the test laboratory to calculate and record measurement uncertainty in the test report. It also states that the result used for conformity is the measured value compared with the limit, together with the recorded uncertainty.
What terms does SIST EN 300 676 V1.3.1:2003 define?
- Aeronautical mobile service - A mobile service between aeronautical stations and aircraft stations, with survival craft stations also able to participate.
- Conducted measurements - Measurements made through a direct RF connection to the equipment under test.
- Radiated measurements - Measurements made from a radiated field rather than by direct connection.
- Integral antenna equipment - Equipment with an antenna built into the unit and treated as part of the equipment.
- Ground base station - Aeronautical station equipment for use with an external antenna at a fixed location.
- ACARS - Aircraft Communications Addressing and Reporting System, the data application named in the standard.
- SINAD - Signal + Noise + Distortion divided by Noise + Distortion, used to judge receiver performance.
Who uses SIST EN 300 676 V1.3.1:2003?
Accredited test laboratories use SIST EN 300 676 V1.3.1:2003 to assess transmitter and receiver performance. Manufacturers use it to design and type-test ground-based aeronautical radio equipment before market release.
Authorities and approval bodies use it when granting type approval or checking equipment already on the market. Buyers, integrators and quality managers use it to confirm that a product is intended for the right channel spacing, operating band and installation type.
What changed in SIST EN 300 676 V1.3.1:2003 from the previous edition?
SIST EN 300 676 V1.3.1:2003 is the 2003 publication of the standard and follows earlier ETS 300 676 editions listed in the document history. The scope notes that it includes several minor technical modifications and some textural changes made in light of practical experience.
Which standards are used with SIST EN 300 676 V1.3.1:2003?
- ETSI ETR 028 - Used for calculating measurement uncertainties.
- ICAO Annex 10 Volume V - Used for the aeronautical spectrum and channel assignments, especially for 8,33 kHz and 25 kHz operation.
- ITU-T Recommendation P.53 - Provides the psophometric telephone filtering network used in SINAD and noise measurements.
- ISO 7637 (parts 1 and 2) - Used for power-supply disturbance requirements for equipment intended for vehicle installation.
- ICAO Annex 10 Volume III Part 2 - Listed in the bibliography as background for voice communication systems.
What does the SIST EN 300 676 V1.3.1:2003 document contain?
The standard contains step-by-step test methods for transmitter and receiver performance, including set-ups with coaxial terminations, combining networks, spectrum analysers, network analysers and psophometric filters. It also includes tables of limits for frequency error, power, modulation, emissions, rejection and timing.
Figures show the arrangements for transmitter group delay, broadband noise, intermodulation attenuation, transmitter keying transients, and receiver group delay. Annex B gives the selectivity shape and technical behavior expected of the adjacent-channel power measuring receiver, while Annex A gives practical cable arrangement guidance to improve repeatability.
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Frequently Asked Questions
SIST EN 300 676 V1.3.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Electromagnetic compatibility and Radio spectrum Matters (ERM); Ground-based VHF hand-held, mobile and fixed radio transmitters, receivers and transceivers for the VHF aeronautical mobile service using amplitude modulation; Part 1:Technical characteristics and methods of measurement". This standard covers: Several minor technical modifications and some textural changes are necessary in the light of practical experience.
Several minor technical modifications and some textural changes are necessary in the light of practical experience.
SIST EN 300 676 V1.3.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.060.20 - Receiving and transmitting equipment; 33.100.01 - Electromagnetic compatibility in general; 49.090 - On-board equipment and instruments. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 676 V1.3.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.SUHMHPQLNLRGGDMQLNLElectromagnetic compatibility and Radio spectrum Matters (ERM); Ground-based VHF hand-held, mobile and fixed radio transmitters, receivers and transceivers for the VHF aeronautical mobile service using amplitude modulation; Part 1:Technical characteristics and methods of measurement49.090On-board equipment and instruments33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:EN 300 676 Version 1.3.1SIST EN 300 676 V1.3.1:2003en01-december-2003SIST EN 300 676 V1.3.1:2003SLOVENSKI
STANDARD
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 2
Reference REN/ERM-TG25-020 Keywords aeronautical, AM, DSB, radio, testing, VHF ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: editor@etsi.org Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2003. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 676 V1.3.1:2003
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 3
Contents Intellectual Property Rights.7 Foreword.7 Introduction.7 1 Scope.8 2 References.8 3 Definitions and abbreviations.8 3.1 Definitions.8 3.2 Abbreviations.9 4 General requirements.9 4.1 Controls and indicators.9 4.2 Class of emission and modulation characteristics.10 4.3 Warm up.10 5 Test conditions, power sources and ambient temperatures.10 5.1 Normal and extreme test conditions.10 5.2 Test power source.10 5.3 Normal test conditions.10 5.3.1 Normal temperature and humidity.10 5.3.2 Normal power sources.11 5.3.2.1 Mains voltage and frequency.11 5.3.2.2 Regulated lead-acid battery power sources used on vehicles.11 5.3.2.3 Other power sources.11 5.4 Extreme test conditions.11 5.4.1 Extreme temperatures.11 5.4.2 Extreme values of test power sources.11 5.4.2.1 Mains voltage.11 5.4.2.2 Other power sources.11 5.4.3 Extended temperatures.11 5.5 Performance test.12 5.6 Environmental tests.12 5.6.1 General.12 5.6.2 Procedure for tests at extreme temperatures.12 5.6.3 Temperature tests.12 5.6.3.1 High temperature.13 5.6.3.2 Low temperature.13 6 General conditions of measurement.13 6.1 Receiver test signal arrangement.13 6.1.1 Test signal sources.13 6.1.2 Nominal frequency.13 6.1.3 Normal test signal.13 6.1.4 Squelch.13 6.1.5 Normal audio output power.13 6.1.6 Audio AGC.14 6.2 Transmitter test signal arrangement.14 6.2.1 Coaxial termination.14 6.2.2 Signal sources.14 6.2.3 Normal test signal.14 6.3 Test channels.14 7 Transmitter.14 7.1 Protection of the transmitter.14 7.1.1 Definition.14 7.1.2 Method of measurement.14 SIST EN 300 676 V1.3.1:2003
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 4
7.1.3 Requirement.14 7.2 Frequency error.15 7.2.1 Definition.15 7.2.2 Method of measurement.15 7.2.3 Limits.15 7.3 Carrier power.15 7.3.1 Definitions.15 7.3.2 Method of measurement.15 7.3.3 Tolerances.16 7.3.3.1 Normal test conditions.16 7.3.3.2 Extreme test conditions.16 7.4 Amplitude modulation characteristic.16 7.4.1 Modulation depth (speech).16 7.4.1.1 Definitions.16 7.4.1.2 Method of measurement.16 7.4.1.3 Limits.16 7.4.1.4 Modulation depth (data mode).16 7.4.1.5 Method of measurement.16 7.4.1.6 Limits.16 7.4.2 Modulation compression (speech mode).17 7.4.2.1 Definition.17 7.4.2.2 Method of measurement.17 7.4.2.3 Limits.17 7.4.3 Amplitude modulation distortion.17 7.4.3.1 Definition.17 7.4.3.2 Method of measurement.17 7.4.3.3 Limits.17 7.4.4 Audio frequency response.18 7.4.4.1 Definition.18 7.4.4.2 Method of measurement.18 7.4.4.3 Limits 8,33 kHz channel spacing.18 7.4.4.4 Limits 25 kHz channel spacing.18 7.4.5 Group delay variation (data mode only).19 7.4.5.1 Definition.19 7.4.5.2 Transmitter method of measurement.19 7.4.5.3 Limits.19 7.5 Adjacent channel power.20 7.5.1 Definition.20 7.5.2 Measurement.20 7.5.3 Limits.20 7.6 Broadband noise measurement.21 7.6.1 Definition.21 7.6.2 Method of measurement.21 7.6.3 Limit.21 7.7 Conducted spurious emissions.22 7.7.1 Definition.22 7.7.2 Method of measurement.22 7.7.3 Limits.22 7.8 Intermodulation attenuation.23 7.8.1 Definition.23 7.8.2 Method of measurement.23 7.8.3 Limits.23 7.9 RF power attack time and release time.24 7.9.1 Definitions.24 7.9.2 Method of measurement.24 7.9.2.1 Attack time.24 7.9.2.2 Release time.25 7.9.3 Limits.25 7.10 Keying Transient frequency behaviour of the transmitter.25 7.10.1 Definitions.25 7.10.2 Method of measurement.26 7.10.3 Limits.26 SIST EN 300 676 V1.3.1:2003
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 5
8 Receiver.26 8.1 Sensitivity.26 8.1.1 Definition.26 8.1.2 Method of measurement.27 8.1.3 Limits.27 8.2 Harmonic distortion.27 8.2.1 Definition.27 8.2.2 Method of measurement.27 8.2.3 Limits.27 8.3 Audio frequency response.28 8.3.1 Definition.28 8.3.2 Method of measurement.28 8.3.3 Limits.28 8.3.4 Limit for ACARS operation.28 8.4 Audio noise.28 8.4.1 Definition.28 8.4.2 Method of measurement.28 8.4.3 Limits.28 8.5 Effective acceptance bandwidth.29 8.5.1 Definition.29 8.5.2 Method of measurement.29 8.5.3 Limits.29 8.6 Adjacent channel rejection.29 8.6.1 Definition.29 8.6.2 Method of measurement.29 8.6.3 Limits.30 8.7 Spurious response rejection.30 8.7.1 Definition.30 8.7.2 Introduction to the method of measurement.30 8.7.3 Method of search of the limited frequency range.31 8.7.4 Method of measurement.31 8.7.5 Limit.31 8.8 Intermodulation response rejection.31 8.8.1 Definition.31 8.8.2 Method of measurement.32 8.8.3 Limit.32 8.9 Blocking or desensitization.32 8.9.1 Definition.32 8.9.2 Method of measurement.32 8.9.3 Limit.33 8.10 Conducted spurious emissions.33 8.10.1 Definition.33 8.10.2 Method of measuring the power level.33 8.10.3 Limits.33 8.11 Squelch operation.34 8.11.1 Definition.34 8.11.2 Method of measurement.34 8.11.3 Limits.34 8.12 Cross modulation rejection.35 8.12.1 Definition.35 8.12.2 Method of measurement.35 8.12.3 Limits.35 8.13 Receiver dynamic range.35 8.13.1 Definition.35 8.13.2 Method of measurement.35 8.13.3 Limit.36 8.14 AGC attack time and release time (data mode only).36 8.14.1 Definitions.36 8.14.2 Method of measurement.36 8.14.2.1 Attack time.36 8.14.2.2 AGC Decay time.36 8.14.3 Limits.36 SIST EN 300 676 V1.3.1:2003
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8.15 AF AGC.37 8.15.1 Definition.37 8.15.2 Method of measurement.37 8.15.3 Limit.37 8.16 Group delay variation (data mode only).37 8.16.1 Definition.37 8.16.2 Receiver method of measurement.37 8.16.3 Limits.38 9 Measurement uncertainty and interpretation of the measured results.38 9.1 Maximum measurement uncertainties.38 9.2 Interpretation of the measurement results.39 Annex A (normative): Auxiliary cables.40 Annex B (normative): Specification for adjacent channel power measurement arrangements.41 B.1 Power measuring receiver specification.41 B.1.1 IF filter.41 B.1.2 Attenuation indicator.42 B.1.3 RMS value indicator.42 B.1.4 Oscillator and amplifier.42 Annex C (informative): Bibliography.43 History.44
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 7
Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http://webapp.etsi.org/IPR/home.asp). All published ETSI deliverables shall include information which directs the reader to the above source of information. Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio spectrum Matters (ERM).
National transposition dates Date of adoption of this EN: 28 March 2003 Date of latest announcement of this EN (doa): 30 June 2003 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 December 2003 Date of withdrawal of any conflicting National Standard (dow): 31 December 2003
Introduction The present document states the minimum performance requirements for ground based radio transmitters, transceivers and receivers for the aeronautical mobile service operating in the VHF band (118 MHz to 136,975 MHz), using Double Sideband Amplitude Modulation with 8,33 kHz or 25 kHz channel spacing. The present document may be used by accredited test laboratories for the assessment of the performance of the equipment. The performance of the equipment submitted for type testing should be representative for the performance of the corresponding production model. The present document has been written on the assumption that: - the type test measurements will be performed only once, in an accredited test laboratory and the measurements accepted by the various authorities in order to grant type approval; - if equipment available on the market is required to be checked it will be tested in accordance with the methods of measurement specified in the present document. SIST EN 300 676 V1.3.1:2003
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 8
1 Scope The present document states the minimum performance requirements for radio transmitters receivers and transceivers at ground-based aeronautical stations operating in the VHF band (118 MHz to 136,975 MHz) allocated to the aeronautical mobile service. The present document applies to DSB AM systems, with channel separations of 8,33 kHz or 25 kHz intended for analogue speech and ground base stations with a channel spacing of 25 kHz intended for ACARS data communication. The scope of the present document is limited to ground base stations, ground mobile and hand held radios for ground use. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. • References are either specific (identified by date of publication and/or edition number or version number) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. [1] ETSI ETR 028: "Radio Equipment and Systems (RES); Uncertainties in the measurement of mobile radio equipment characteristics". [2] ICAO annex 10 volume V (1996): "Aeronautical Radio Frequency Spectrum Utilization". [3] ITU-T Recommendation P.53: "Psophometer for use on telephone-type circuits". [4] ISO 7637 (parts 1 and 2): "Road vehicles - Electrical disturbances from conduction and coupling". 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: aeronautical mobile service: mobile service between aeronautical stations and aircraft stations, or between aircraft stations, in which survival craft stations may participate conducted measurements: measurements which are made using a direct RF connection to the equipment under test radiated measurements: measurements which involve the measurement of a radiated field integral antenna equipment: radio communications equipment with an antenna integrated into the equipment without the use of an external connector and considered to be part of the equipment NOTE: An integral antenna may be internal or external to the equipment. In equipment of this type, a 50 Ω RF connection point shall be provided for test purposes. A connection point for an AF modulating input and for AF output measurements shall also be provided. ground base station: aeronautical station equipment, in the aeronautical mobile service, for use with an external antenna and intended for use at a fixed location SIST EN 300 676 V1.3.1:2003
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 9
hand held: radio equipment with integral batteries, designed to be hand portable and operated hand held mobile station: radio equipment designed for permanent or temporary vehicle installation and operation, including provision for vehicle DC power supply, and connections for external antenna, PTT key, microphone, speaker and/or headphone non-integral antenna equipment: radio communications equipment with a connector intended for connection to an antenna portable station: radio equipment with integral battery for independent hand-carried use NOTE: Provisions may be made for connections of an external antenna, PTT key, microphone, headphone and charger, but principally to be operated as a self contained unit. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ACARS Aircraft Communications Addressing and Reporting System AF Audio Frequency AGC Automatic Gain Control AM Amplitude Modulation dBc dB relative to the carrier power DSB Double Side Band I/P Input ICAO International Civil Aviation Organization IF Intermediate Frequency O/P Output ppm parts per million RF Radio Frequency rms root mean square SINAD (Signal + Noise + Distortion)/(Noise + Distortion) VSWR Voltage Standing Wave Ratio 4 General requirements 8,33 kHz equipment shall be able to operate on all channels in the List of Assignable Frequencies defined in Appendix 2, chapter 4, Group F (see clause 4.1.8.1.2) of the ICAO Annex 10 Volume V [2]. The channel labelling used for 8,33 kHz channel spacing is based on a frequency-channel pairing in accordance with table 4.1 (bis) of ICAO Annex 10 Volume V [2] clause 4.1.2.4. 25 kHz equipment shall be able to operate on the frequencies 118,0 MHz to 136,975 MHz in accordance with ICAO Annex 10 Volume V [2], Appendix to Chapter 4. It shall not be possible to transmit while any frequency synthesizer used within the transmitter is out of lock. It shall not be possible to transmit during channel switching operations. 4.1 Controls and indicators The equipment shall have the following controls and indicators as a minimum: • a visual indication that the device is switched on; • a facility to disable the squelch for test purposes; • a visual indication that the carrier is being produced. SIST EN 300 676 V1.3.1:2003
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 10 The equipment shall also meet the following requirements: • the user shall not have access to any control which, if wrongly set, might impair the technical characteristics of the equipment. 4.2 Class of emission and modulation characteristics The equipment shall use Double Side Band (DSB) Amplitude Modulation (AM) full carrier, (6K80A3EJN for 25 kHz, 5K00A3EJN for 8,33 kHz), for speech and 13k0A2D for data. The equipment shall be designed to operate satisfactorily with a channel separation of 8,33 kHz or 25 kHz. 4.3 Warm up After being switched on the equipment shall meet the requirements of the present document within one minute under normal test conditions (see clause 5.3). If the equipment includes parts which require to be heated in order to operate correctly (e.g. crystal ovens) a warming-up period of 30 minutes of those parts shall be allowed. 5 Test conditions, power sources and ambient temperatures 5.1 Normal and extreme test conditions Measurements shall be made under normal test conditions (see clause 5.3) and also, where stated, under extreme test conditions (see clauses 5.4.1 and 5.4.2). 5.2 Test power source During testing, the equipment shall be supplied from a test power source capable of producing normal and extreme test voltages. The internal impedance of the test power source shall be low enough for its effect on the test results to be negligible. For the purpose of testing the power source voltage shall be measured at the input terminals of the equipment. During testing, the power source voltages shall be maintained within a tolerance of ±3 % relative to the voltage level at the beginning of each test. 5.3 Normal test conditions 5.3.1 Normal temperature and humidity The normal temperature and humidity conditions for tests shall be a combination of temperature and humidity within the following ranges: temperature:
+15°C to +35°C; relative humidity: 20 % to 75 %. When it is impracticable to carry out the tests under these conditions, a note to this effect, stating the ambient temperature and relative humidity during the tests, shall be added to the test report. SIST EN 300 676 V1.3.1:2003
ETSI ETSI EN 300 676 V1.3.1 (2003-03) 11 5.3.2 Normal power sources 5.3.2.1 Mains voltage and frequency The normal test voltage for equipment to be connected to the mains shall be the nominal mains voltage. For the purpose of the present document, the nominal voltage shall be the declared voltage or any of the declared voltages for which the equipment was designed. The frequency of the test power source corresponding to the AC mains shall be between 49 Hz and 51 Hz. 5.3.2.2 Regulated lead-acid battery power sources used on vehicles When the radio equipment is intended for operation from the usual types of regulated lead-acid battery power source used on vehicles, the normal test voltage shall be 1,1 times the nominal voltage of the battery (6 V, 12 V etc.). 5.3.2.3 Other power sources For operation from other power sources or types of battery (primary or secondary), the normal test voltage shall be that declared by the equipment manufacturer. 5.4 Extreme test conditions 5.4.1 Extreme temperatures For tests at extreme temperatures, measurements shall be made in accordance with clause 5.5, at a lower temperature
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