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GB/T 25102.13-2010 English PDF (GBT25102.13-2010)

GB/T 25102.13-2010 English PDF (GBT25102.13-2010)

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GB/T 25102.13-2010: Electroacoustics -- Hearing aids -- Part 13: Electromagnetic compatibility (EMC)

GB/T 25102.13-2010
Electroacoustics - Hearing aids - Part 13. Electromagnetic compatibility (EMC) ICS 33.160.10
M72
National Standards of People's Republic of China
Electroacoustic hearing aid
Part 13. Electromagnetic compatibility (EMC)
Part 13. Electromagneticcompatibility (EMC)
(IEC 60118-13.2004, IDT)
Released on.2010-09-02
2011-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued
Content
Foreword I
1 range 1
2 Normative references 1
3 Terms and Definitions 1
4 Product operation and function 2
5 EMC environment regulations 2
6 Immunity requirements 2
7 Immunity test procedure 3
8 Measurement uncertainty 5
Appendix A (Informative Appendix) Establishing Test Methods, Performance Criteria and Test Level Background 6 A.1 Overview 6
A.2 Test Method 6
A.3 Performance criteria 7
A.4 Test field strength - neighbors compatible 7
A.5 Test field strength - user compatible 8
Reference 10
Foreword
GB/T 25102 "Electrical Acoustic Hearing Aid" is divided into 14 parts.
---Part 0. Measurement of electroacoustic characteristics;
--- Part 1. Hearing aids with inductive pickup coil inputs;
--- Part 2. Hearing aids with automatic gain control circuits;
--- Part 3. Hearing aids that are not fully worn on the listener;
--- Part 4. Magnetic field strength of induction loop systems for hearing aids; ---Part 5. Papillary joints for plug-in headphones;
--- Part 6. Characteristics of the hearing aid input circuit;
--- Part 7. Performance measurement of quality inspections for delivery of hearing aid products; --- Part 8. Simulating the measurement method of hearing aid performance under actual working conditions; --- Part 9. Methods for measuring the characteristics of hearing aids with the output of bone vibrators; --- Part 11. Symbols and markings for hearing aids and related equipment; --- Part 12. Dimensions of electrical connector systems;
--- Part 13. Electromagnetic compatibility (EMC);
--- Part 14. Specification of digital interfaces.
This part is the 13th part of GB/T 25102.
This part is equivalent to IEC 60118-13.2004 "Electrical Acoustic Hearing Aids Part 13. Electromagnetic Compatibility (EMC)" (English version). For ease of use, this section makes the following editorial changes to IEC 60118-13.2004. a) change the preamble in IEC 60118-13.2004 to the preamble of the country; b) delete the contents of the "Introduction";
c) replace “this standard” with “this part”;
d) replace “,” with a decimal point “.”;
e) The reference document “IEC 60118-0” was changed to “GB/T 25102.100”; f) The reference document “IEC 60118-2” was changed to “GB/T 25102.2”;
g) The reference document “IEC 61000-4-3” was changed to “GB/T 17626.3”; h) The guiding language of the chapter of the normative reference document shall be modified in accordance with the provisions of GB/T 1.1-2000; i) In accordance with the drafting provisions of 6.2.2 of GB/T 1.1-2000, the original IEC 60118- 13 specific definitions of proximity compatibility and user compatibility, compatibility and proximity to neighbors in the definition chapter User compatibility gives a clear definition.
Appendix A of this section is an informative annex.
This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This part is under the jurisdiction of the National Electroacoustic Standardization Technical Committee. This section drafted by. China Electronics Technology Group Corporation Electronics Third Institute, Ministry of Information Industry Telecommunications Research Institute. The main drafters of this section. He Aiying, He Guili.
Electroacoustic hearing aid
Part 13. Electromagnetic compatibility (EMC)
1 Scope
This section specifies the requirements and measurement methods for electromagnetic compatibility immunity of hearing aids. This section applies to all electromagnetic compatibility phenomena associated with hearing aids. At present, people have not really understood radio frequency disturbance and electrostatic discharge. The impact on hearing aids is therefore not covered in this section. With the development of technology, RF harassment and electrostatic discharge will be in the standard future The version is considered in the expansion of this section. The immunity of the hearing aid to the high frequency electromagnetic field generated by the wireless telephone system is currently only An electromagnetic compatibility phenomenon associated with hearing aids that has been identified. For hearing aids, GB/T 17626.3 is the basic standard for electromagnetic compatibility testing. Two types of hearing aids are defined by usage. Immunity level (see 3.1).
This section does not give a hearing aid for the output of a silent signal and a measuring method for a hearing aid connected to other devices via a cable. 2 Normative references
The terms in the following documents become the provisions of this part by reference in this part of GB/T 25102. Quotations with dated And all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouragement is achieved in accordance with this section. The parties to the agreement study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this section. GB/T 25102.100 Electroacoustic hearing aids - Part 0. Measurement of electroacoustic characteristics (GB/T 25102.100-2010, IEC 60118-0.1983, MOD)
GB/T 25102.2 Electroacoustic hearing aids - Part 2. Hearing aids with automatic gain control circuits (GB/T 25102.2- 2010, IEC 60118-2. 1983, MOD)
GB/T 17626.3 Electromagnetic compatibility test and measurement technology RF electromagnetic field radiation immunity test (GB/T 17626.3- 2006, IEC 61000-4-3.2002, IDT)
IEC 60118-7 Hearing aids - Part 7. Performance measurement for quality inspection of hearing aids on delivery IEC 60126 measuring IEC reference coupling cavity for hearing aid earphones IEC 61000-4-20 Electromagnetic compatibility (EMC) Part 4-20. Test and measurement techniques Disturbance test
3 Terms and definitions
GB/T 25102.100, IEC 60118-7, GB/T 17626.3 and the following terms and definitions apply to this section. 3.1
Hearing aid hearingaid
A device used to help a hearing impaired person, usually consisting of a microphone, an amplifier, and a headset, powered by a low voltage battery. Note. Hearing aids can be placed on the body (BW), behind the ear (BTE) or in the ear (ITE). 3.2
Proximity compatibility bystandercompatibility
The immunity of the hearing aid ensures that the hearing aid is functioning when the hearing aid wearer is in an environment where the digital wireless device is operating (2m, see A.4).
3.3
User compatibility usercompatibility
The immunity of the hearing aid ensures that the hearing aid is functioning properly when the hearing aid wearer uses the digital wireless device through the hearing aid. 3.4
Reference direction referenceorientation (ofahearingaid)
The direction of the hearing aid relative to the RF source is equivalent to the direction of the hearing aid when the person is facing the RF source in practical applications. Note. In the immunity test of hearing aids, it is found that the direction of normal use of the hearing aid is more suitable when the RF source is on two orthogonal axes (see Appendix). A).
3.5
Input related interference level input relatedinterferencelevel;IRIL
The level used to characterize the hearing aid immunity characteristics. Note. IRIL in acoustics is expressed in decibels relative to 20μPa. When the hearing aid is in the microphone mode and exposed to the 1 kHz modulated RF field, The IRIL is calculated by subtracting the gain of the hearing aid from the 1 kHz signal level measured at the output of the hearing aid. The gain of the hearing aid is at the input Determined under conditions of 55dB sound pressure level.
If the hearing aid provides an additional pointing microphone, the gain determined using the omnidirectional microphone will be used to determine the IRIL value. If the hearing aid provides a pickup coil, the controls in the acoustic measurement will still be used in the test. IRIL meter in pickup coil mode It is shown as the equivalent acoustic input rms (rms) expressed in decibels relative to 20 μPa, based on the assumption of a magnetic field strength of -20 dB with reference to 1 A/m. The degree corresponds to an acoustic pressure level of 70 dB.
When the hearing aid is in the pickup coil mode and exposed to the 1 kHz modulated RF field, the IRIL value in the pickup coil mode is output from the hearing aid The difference between the measured 1 kHz signal level minus the hearing aid output 1) and 55 dB is calculated. A decrease in the IRIL value indicates an increase in the immunity.
4 Product operation and function
The hearing aid consists essentially of a microphone, an amplifier and a headphone. For behind-the-ear (BTE) hearing aids, the sound is usually determined by a separate The ear mold (ear plug) is fed into the ear canal. An in-ear (ITE) hearing aid has an active circuit located in the ear canal. 1) Determined at a frequency of 1 kHz with a reference level of -35 dB at 1 A/m. Hearing aids typically use a battery as a power source. For some hearing aids, the user can adjust the help manually or even by remote control. The controller of the listener.
5 EMC environment regulations
Hearing aids are used in all environments described in GB/T 17626.3.
6 Immunity requirements
Table 1 specifies the field strength of the RF test signal when determining the hearing aid immunity. Neighbor compatibility is a minimum requirement and user compatibility Sex is an additional feature that can be stated in the instructions if the hearing aid is compatible with the user. Table 1 RF test signal field strength when determining hearing aid immunity Proximity compatibility
IRIL ≤ 55dB when in the following field strength
The field strength is expressed in V/m.
User compatibility
IRIL ≤ 55dB when in the following field strength
The field strength is expressed in V/m.
Frequency Range
GHz
0.08~0.80.8~0.960.96~1.41.4~2.02.0~3.00.08~0.80.8~0.960.96~1.41.4~2.02.0~3.0 Table 1 (continued)
Proximity compatibility
IRIL ≤ 55dB when in the following field strength
The field strength is expressed in V/m.
User compatibility
IRIL ≤ 55dB when in the following field strength
The field strength is expressed in V/m.
Microphone mode considerations 3 considerations 2 considerations considerations 75 considerations 50 considerations Pickup coil
Mode b
Considering 3 in consideration 2 considering considerations in consideration Pointing microphone
Mode b
Considering 3 in consideration 2 in consideration
No correlation
Regulation
No correlation
Regulation
No correlation
Regulation
No correlation
Regulation
No correlation
Regulation
a The test field strength given is the unmodulated carrier value.
b If the hearing aid provides this mode.
At present, it has not been found that radio frequency interference sources with frequencies below 0.8 GHz will affect hearing aids, so this frequency is not considered at this time. Test within the rate range. At the same time, since wireless phones generally do not provide inductive coupling, user compatibility in the pickup coil mode The request is still under consideration. Even if the hearing aid supports another microphone input selection (pointing to the microphone), it is not considered in this mode. User compatibility. Proximity compatibility in the pickup coil mode is important for anti-jamming performance in an inductive loop environment. with When a pickup coil can be used as an input transducer to receive signals transmitted by a mobile phone-assisted listening device (for example, a portable hands-free terminal) Hearing aids, proximity compatibility in the pickup coil mode is also important. Because devices working in other frequency bands are becoming more popular, for example Bluetooth and the Global System for Mobile Telephone (UMTS), this section may increase testing in these bands in future releases. Note. When high field strength is required, the RF power amplifier may be distorted and it must be ensured that the distortion does not affect the test results. 7 Immunity test procedure
7.1 Radio frequency test equipment, test arrangements and test procedures specified in IEC 61000-4-20 should be used. Requires 1 kHz, 80% sine wave modulated carrier signal.
Note. For small devices without connectors (such as hearing aids), suitable GTEM cells and striplines as described in IEC 61000-4-20 can be used. 7.2 In the test device, objects that distort the RF field are not allowed except for the hearing aid. In order to remove the metal coupling cavity specified in IEC 60126 from the test device, the normal conduit between the hearing aid and the coupling cavity will be A catheter with a hole diameter of 2 mm and a typical length value of 50 mm to 1000 mm is substituted. For in-ear devices, the outlet of the receiver should Coupled to the catheter by a suitable adapter. Since the gain of the hearing aid is determined in each individual test setup, the adaptation The length of the device and the catheter are not important, and an example of a test arrangement is given in Figure 1. 7.3 The gain controller of the hearing aid should be adjusted to the reference test position. The other controllers should be set to the basics described in IEC 60118-7. Set the location.
Note. The noise floor level of the test arrangement is at least 10 dB lower than the lowest interference level of interest. Figure 1 Example. Hearing aid immunity test placement with GTEM chamber 7.4 Measure the hearing aid according to the requirements of GB/T 25102.2 according to the acoustic coupling described in 7.2 and the test conditions described in 7.3. Input and output response at a frequency of 1000 Hz. This test applies to all hearing aids, not just automatic gain control (AGC) assistance. Listener. The gain at the 55dB sound pressure level (SPL) input level can be derived from the input and output curves. If the hearing aid provides a pickup The coil can be used to derive the output sound pressure level at -35dB input with reference to 1A/m. The input and output response curves are given in Figure 2. example.
Figure 2 Example. Input-output response curve at 1000Hz and gain determination at 55dB input level 7.5 Hearing aids shall be set up and placed in the RF field as described in 7.3, using a bandpass filter with a maximum bandwidth of 1/3 octave To determine the sound pressure level of the 1000 Hz interference signal. The hearing aid should be placed in the reference direction (see 3.4) and then rotated 90° along the horizontal plane. In each direction, the carrier frequency should Sweep with a step of 1% carrier frequency as specified in GB/T 17626.3. Note. The test results of hearing aids with automatic signal processing (ASP) characteristics or other non-linear processing functions should be carefully analyzed because interference signals may Activate these systems in an unpredictable way.
7.6 The classification of the immunity of hearing aids is determined according to Table 1, if the hearing aids are compatible with the user at all frequencies and directions. If required, then the test can be ended, otherwise the proximity compatibility test will be performed. The test will pass through the microphone, pointing to the microphone (if mention For) and the pickup coil (if provided). For pointing microphones, this will be determined by the output value measured with an omnidirectional microphone in 7.4. IRIL. For a pickup coil, the output value measured in 7.4 will be used to determine the input at -35dB with a reference of 1A/m. Set IRIL, Figure 3 gives an example of determining IRIL.
Figure 3 Example. Determination of IRIL by electromagnetic compatibility test 7.7 The test report shall include test results for all input modes and IRIL values over the entire carrier frequency range, eg for field strength 75V/m frequency range from 800MHz to 960MHz, microphone mode, if IRIL ≤ 55dB sound pressure level, test results can be reported As follows. The user is compatible with 800MHz~960MHz, microphone mode. The frequency range of user compatibility in the test report can be narrower than the entire test range. For example, the user is compatible with 1714MHz~ 1856MHz. Even if the hearing aid does not meet the user compatibility requirements throughout the test range, the hearing aid can still be declared The transmission frequency of the mobile cellular telephone network meets the user compatibility requirements. 8 Measurement uncertainty
Measurement uncertainty consists of several factors.
--- Uncertainty in the use of equipment, such as signal generators, level meters, measuring microphones and coupling cavities. --- Deviation in the acoustic coupling of the hearing aid to the coupling cavity. These deviations are related to the diameter and length of the catheter. --- Accurate and careful positioning of hearing aids.
Taking into account the above factors, the uncertainty of the measurement can be determined. Note. It is best to verify the uncertainty by comparing the test results with an accredited laboratory. In order to guarantee nominal data, the manufacturer and the buyer have different interpretations of the uncertainty. Manufacturer Product Test Limit Value. Difference minus measurement uncertainty. The limit value acceptable to the purchaser test. nominal data plus measurement uncertainty. Appendix A
(informative appendix)
Establish test methods, performance criteria and test level background
A.1 Overview
In order to establish the basis for testing the influence of the interference source and determining the actual value of the hearing aid immunity. European Federation of Hearing Instrument Manufacturers (EHIMA) undertook a series of measurements in.1994, and at the same time, the same work was done in Australia, focusing on measurement And provide a basis for pointing out the situation of the neighbors. Due to the lack of knowledge on this topic and the fact that mobile power is rarely used in most countries At the time, there was a limit to the need to deal with the user's problems. However, with the rapid growth in the use of mobile phones, this problem is solved for hearing aid wearers who want to use mobile phones. The problem has become very urgent. The United States began researching this issue in.1997 with the aim of proposing methods for measuring hearing aids and mobile phones. This The work achieved the ANSI C63.19 [4] standard and facilitated further evaluation of the draft in Europe. A.2 Test method
The final report of the Global Mobile Telecommunications System (EHIMAGSM) project [2] introduced the development of the EHIMAGSM project. The phased outcome, the EHIMAGSM project is a very comprehensive topic set up by EHIMA to establish a test environment. Member companies are able to handle product issues related to GSM interference. Other research findings related to the EHIMAGSM project are also included in the report. The relevant parts of the subject are summarized below.
Five types of hearing aids were selected for laboratory study, representing different electroacoustic chara...

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