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GB/T 25102.13-2010 (GB/T25102.13-2010, GBT 25102.13-2010, GBT25102.13-2010) & related versions
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GB/T 25102.13-2010: PDF in English (GBT 25102.13-2010)
GB/T 25102.13-2010
Electroacoustics - Hearing aids - Part 13. Electromagnetic compatibility (EMC)
ICS 33.160.10
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
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
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.
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).
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).
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.
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).
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
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
No correlation
No correlation
No correlation
No correlation
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.
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 characteristics, interference levels, and interference spectra. Total input
The correlation interference level (OIRIL) is used to characterize the interference performance of the hearing aid. The total input correlation interference level is expressed in terms of the sound pressure level expressed in decibels.
First, the hearing aid is acoustically tested in accordance with GB/T 25102.100. In order to be able to remove the metal dummy ear from the RF field, use
A 500 mm long catheter is connected between the hearing aid and the simulated ear for acoustic coupling. You can see the acoustics brought about by this change.
Big change. This means that a gain measurement should be made for each hearing aid being tested to determine OIRIL.
The hearing aid is exposed to an anechoic chamber with an analog GSM RF field placed in the normal direction of use. Peak field strength 10V/m
As a test signal, it is equivalent to a mobile phone with a power of 8W generated at a distance of 2m or a mobile phone with a power of 2W at a distance of 1 m.
Field strength.
The frequency spectrum of the interfering signal in the direction causing the maximum interference can be determined by experiment, and the gain of the hearing aid is subtracted from the input correlation spectrum.
To finalize OIRIL.
The normalized input correlation spectrum is almost the same for all tested hearing aids, and the harmonic level decreases as the frequency increases. This means
For the immunity test, only the low frequency part of the spectrum is needed to determine the OIRIL with sufficient accuracy.
The rotation of the hearing aid on the horizontal plane affects the interference performance to some extent, and the angle of maximum interference for different hearing aids is not
with. In virtually all cases, the vertical electric field polarization of the RF field tends to cause the highest interference level, as is the case with GSM devices.
There is a relatively large difference in OIRIL between different types of hearing aids, even in the same type of sample.
When the ratio of the field strength to the interference level is expressed in decibels as 1.2, the field strength range at this ratio is considered to be an interference signal greater than the hearing aid.
The field strength (linear) but does not saturate the field strength range (Figure A.1).
Figure A.1 The ratio of field strength to interference level (dB) is 1.2
Some tests were conducted to determine the effects of hearing aids placed behind the ears and in the ears. When the person's head is between the source and the hearing aid
The head can effectively attenuate the GSM signal, but the GSM signal is not significantly different when the hearing aid is facing the source. Based on this
These findings confirm that the measurement results do not require a "body factor" correction.
Studies have also shown that when using the same carrier level 80%, 1000 Hz sine wave modulation as the simulated GSM signal "peak rms"
When the signal is present, approximately the same input-related interference level is produced on the hearing aid. This is consistent with the conclusions and recommendations in GB/T 17626.3.
Therefore, it was decided to recommend a sine wave modulation for the hearing aid test. The measurement results are expressed in terms of IRIL (input related interference level). press
The OIRIL at the 1000 Hz frequency point was determined in the same manner.
A.3 Performance criteria
In order to establish a basis for acceptable levels, a series of hearing tests were performed on hearing aids. Normalization of all hearing aid interference signals
The input-related spectrum is almost the same, using one of the signals to give a group of 5 people with normal hearing to let them judge that the interference is "no.
"serious", "slightly disturbed", "serious" and "very serious". Interfering signals use different levels and with three different noise and voice messages
The numbers together simulate different hearing situations.
From these test results, it is concluded that the sound pressure level of the free field represents an acceptable level value.
Based on the results of these hearing tests and laboratory studies, it is concluded that in most practical environments 55dB sound pressure level is possible to ensure
Conditions acceptable to hearing aid users. This value has been chosen as the performance criterion in this section. This option passes an additional hearing loss
The research on the subject of the problem has been confirmed.
In summary, IRIL (input-related interference level at 1000 Hz, sound pressure level in decibels) should be used to characterize hearing aids.
The immunity of the device. A decrease in the IRIL value indicates an increase in the immunity. IRIL equal to or less than 55dB sound pressure level is sufficient to ensure hearing aids
The conditions that the user can accept in most practical situations are also recommended as performance criteria.
A.4 Test field strength - neighbors compatible
In order to make the field strength of the hearing aid test closer to the reality, for example, when the hearing aid is interfered by the nearby handheld mobile phone
The environmental field strength should consider the following points.
First, the recommended test procedure is based on some of the worst cases.
--- The maximum interference of the hearing aid in 4 different directions relative to the interference field.
--- The maximum interference in a particular carrier frequency band is used to determine the immunity of the hearing aid. These carrier frequencies are generally related to the actual carrier
The frequency is different.
---The mobile phone works at maximum transmission power, although in reality the mobile phone only transmits at maximum power under certain conditions (battery)
It is fully charged, and the distance between the mobile phone and the base station is far away).
Second, we should pay attention to some actual situations.
--- Users of mobile phones may want to be as confidential as possible, so they will increase the distance from nearby people as much as possible.
--- There are very few complaints about hearing aids being interfered with by mobile phones, even in countries where GSM devices are very popular.
The field strength of 3 V/m (80% sine wave modulation) theoretically corresponds to the field strength produced by a 2W handheld mobile phone at a protection distance of approximately 2 m.
Considering the factors mentioned above, a 2m distance is considered feasible.
A.5 Test field strength - user compatible
The work of EHIMA ended in.1995. As a follow-up to his work, the ISIS-funded project began in.1999.
It is. The subject "Hampedge and Mobile Phone Immunity and Interference Standards---HAMPIIS" aims to establish an IEC 60118
This part of the hearing aid wearers the relevant criteria when they use the mobile phone themselves. Validated in the subject in the standard ANSI C63.19
The test method for hearing aids with dipole antenna near-field radiation is given, and it is found that the dipole is used in the design and development stage of the new hearing aid.
The method of sub-antenna (or a mobile phone) near-field radiation hearing aid is valuable, and he brings valuable information, in Figure A.2.
An example of a test arrangement using a dipole antenna is given.
Figure A.2 Example. Hearing aid immunity test arrangement with dipole antenna
However, as a standard method to test the hearing aid and distinguish the immunity level of the hearing aid, the dipole test is rejected.
The reason for the veto is mainly because the test requires a shielded test environment and the test method from one test layout to another.
The reliability when arranging is relatively low. In addition, the environment that the hearing aid user actually uses is an environment of near-field radiation hearing aids.
Find a good correction between the performance of the test and the real life performance.
Through the study of the immunity of the hearing aid in the user environment, the test field strength of the mobile phone in the near field using the hearing aid is determined. when
When the hearing aid is tested in a GTEM cell with a field strength of 3V/m and an interference signal frequency of 900MHz, there are 12 hearing aids.
The IRIL value is less than 20 to greater than 70, the field strength is 2V/m, and the interference signal frequency is 1800MHz.
From less than 20 to greater than 100. The test was performed by a hearing test method and adjusted by a mobile phone base station simulator.
The 900MHz and 1800MHz GSM phones operate at maximum power. The results of the study show a basis for fairness and reliability,
When tested in GTEM, for a field strength up to 25 times (approx. 28 dB) that achieves a determined near field strength, 75 V/m or higher
At 900MHz and 50V/m or higher at 1800MHz, if the IRIL is below 55dB, the hearing aid will be available in the user environment.
This performance criterion does not guarantee that the hearing aid can withstand the total interference and free noise caused by the use of the wireless phone, but establishes a
In most cases hearing aids have a well-functioning environment. In fact, the hearing aid user will select a mobile phone position near the ear.
Place the hearing aid with minimal or no interference. This w......

Standard ID GB/T 25102.13-2010 (GB/T25102.13-2010)
Description (Translated English) Electroacoustics - Hearing aids - Part 13: Electromagnetic compatibility (EMC)
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard M72
Classification of International Standard 33.160.10
Word Count Estimation 14,130
Date of Issue 2010-09-02
Date of Implementation 2011-04-01
Quoted Standard GB/T 25102.100; GB/T 25102.2; GB/T 17626.3; IEC 60118-7; IEC 60126; IEC 61000-4-20
Adopted Standard IEC 60118-13-2004, IDT
Drafting Organization China Electronics Technology Group Corporation Third Institute of Electronics
Administrative Organization National Standardization Technical Committee electro-acoustics
Regulation (derived from) Announcement of Newly Approved National Standards No. 4 of 2010 (total 159)
Proposing organization Ministry of Industry and Information Technology of the People's Republic of China
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard specifies the hearing electromagnetic compatibility Hang interference degree requirements and methods of measurement, This section applies to all electromagnetic compatibility with hearing aids -related phenomenon, now, people have not really understood RF harassment and electrostatic discharge impact on the hearing aid, so in this part not covered, as technology evolves, shot depiction harassment and electrostatic discharge standards will in future versions or extensions of this section be taken into account, the wireless telephone system to produce hearing aids high-frequency electromagnetic field immunity is currently the only have been identified related to electromagnetic compatibility with hearing aids phenomenon, for the hearing aid is, GB/T 17626. 3 electromagnetic compatibility testing of basic standards, defined according to use two hearing aids immunity level (see 3. 1), this section does not gives the silent signal output hearing aids and other devices via a cable connected to the hearing aid on measurement methods,