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Facing the new EMC regulation GB/T 9254.1-2021, the hard core knowledge you need to know

On December 31, 2021, the National Standardization Administration released GB/T 9254.1-2021 "Information Technology Equipment, Multimedia Equipment and Receivers Electromagnetic Compatibility Part 1: Emission Requirements" and GB/T 9254.2-2021 "Information Technology Equipment Multimedia Equipment and Receivers Electromagnetic Compatibility Part 2: Immunity Requirements", which will be officially implemented on July 1, 2022. For specific standard content, please refer to our news released on February 7th,The News headline is < CCC EMC certification standards will be updated in the second half of 2022! >

On June 10, the China Quality Certification Center officially issued a document to clarify the relevant requirements for the implementation of the new EMC standard. For the text of the notice, please refer to the link:

https://www.cqc.com.cn/www/chinese/c/2022-06-10/559025.shtml


I believe that after reading the full text of the notice, there are still many questions you want to ask about the implementation of the new regulation GB/T 9254.1-2021. Let us interpret it together:



1. About the main differences between GB/T 9254.1-2021 and GB/T 9254-2008


1)Differences and summary between GB/T 9254.1-2021 and GB/T 9254-2008 standard text

Number

New Standard Chapter

GB/T 9254-2008

GB/T 9254.1-2021

Summary

Whether additional testing is required

1

Chapter 7

警告:此为A级产品,在生活环境中,该产品可能会造成无线电干扰。在这种情况下,可能需要用户对其干扰采取切实可行的措施。

警告:在居住环境中,运行此设备可能会造成无线干扰。

A-level statements describe warnings differently.

There will be no rigid requirements for   CQC auditing, and enterprises can   use up the old version of the manual or nameplate before changing the updated   version of the A-level warning.。

NO

2

Appendix C

For the radiated emission measurement below 1GHz,   the imaginary boundary of the EUT is the parallelogram area enclosed by the   dotted and solid lines in the figure below

1.png

The imaginary boundary definition of EUT has   changed, see the red circle area in the figure below

2.png

Modified the definition of boundaries for EUT, AE   and associated cables in radiated emission measurements. Influence on the   radiation emission test items of 0808 and 09 products

NO

3

Table D.1

EUT is divided into desktop units, floor units,   combined units of desk and floor units, units used on the wall (wall   mounted).

The layout of the ETU is changed to desktop,   floor-standing, bench-top or floor-standing, rack-mounted, wall-mounted,   top-mounted, hand-held, wearable, etc.

Increase the ETU layout

NO

4

1

The chapter specifies the measurement at the   user's installation site. See 10.9.

It is expressly stated that field testing is   outside the scope of this standard.

Removed field test method

NO

5

Appendix A

The radiated emission test site below 1 GHz is:   SAC or OATS;

see 10.4.

The radiated emission test sites below 1GHz can   be: SAC, OATS, FAR.

Increase the FAR of the radiated emission test   site below 1GHz

NO

6

Appendix A

Added the 3m method limit in OATS/SAC and the   3m/10m FAR/FSOATS site limit.

NO

7

Appendix A

When the background signal is too strong, it can   be done at other distances, and the limit is adjusted according to

L2=L1(d1/d2)

There is no minimum distance specified.

For the measurement distance not specified in   Table A.2 to Table A.7, if it has been verified by the site (according to   Table 1 and Table 2 of GB/T 6113.104-2016 or C.4.4 of this document), it can   be used in this document. At this time, for the limit L2 corresponding to the   selected measurement distance d2, it should be calculated according to the   following formula:

L2=L1+20log(d1/d2)

The minimum   measurement distance for radiated emissions in frequency bands below 1 GHz   should be 3 m, and the minimum measurement distance for radiated emissions in   frequency bands above 1 GHz should be 1 m. See C.2.2.4

Changes in the formula for calculating distance   limits

NO

8

A.2 and Table B.3

Do it at a flow rate above 10%.

For the 100M/1000M interface, the test should be   performed at the highest rate; for the 10M interface, the same old standard   is required.

Telecom port (RJ45) asymmetric (common mode)   conducted emission modification, test separately according to the applicable   cable type

NO

9

C.2.2.1

Isolated momentary high values are ignored

If the isolated emission level exceeds the   relevant limit, it shall be ignored during the continuous measurement period   of two minutes, provided that the following two conditions are met:

1) This emission level exceeds the limit for a   duration of not more than 1 second;

2) This emission does not exceed the limit more   than once during any 15-second observation period.

Add two conditions for negligible isolated   emission levels

NO

10

Appendix A

Added asymmetric   mode conducted emission test for optical fiber   ports with metal shielding or tensile components and antenna ports (such as GPS, WIFI, etc. ports)   (integrated antenna ports do not need to be tested)

YES

11

Appendix B

scrolling H screen

The screen display image used for testing prefers   color bars with moving picture elements

The new standard puts the product's display   performance parameters at the highest level before testing

NO

As can be seen from the above table, the impact of the new GB/T 9254.1-2021 standard on the use of GB/T 9254-2008 forensic products is mainly in the change of A-level warnings and the addition of asymmetric mode conducted emission tests for optical fiber ports and antenna ports.Other points of difference are the addition or deletion of some details in the testing process.


2)09/16 product category newly added test items in GB/T 9254.1-2021 standard

Whether it is for 09/16 products that have been certified or not, there are two test items that need special attention when changing versions or new applications:

①When the product is not sold with a power adapter, it needs to be considered according to the “DC power port equipment powered by an AC/DC power converter” in Appendix A, and should be considered as an AC power supply device, and the power converter should be used for measurement.


②When the product has optical fiber ports or antenna ports with metal shielding or tensile components, and the expected optical cable exceeds 3m, it is necessary to add asymmetric (common mode) conducted emission test items. If both fiber ports and antenna ports are present, perform two tests.


3)09/16 Products changes in application materials for certificate renewal

For 09/16 certified products (the certification standard does not include GB/T 13837-2012 and not "sold without adapters") as long as the company promises the following contents, supplementary testing is not required, and the certificate can be directly renewed.

 英表二.png



2. About the main differences between GB/T 9254.1-2021 and GB/T 13837-2012


1)Differences and summary of the main text of GB/T 9254.1-2021 and GB/T 13837-2012

Number

New Standard Chapter

GB/T 13837-2012

GB/T 9254.1-2021

Summary

Whether additional testing is required

1

Appendix A

4.5 Disturbance power and measurement of   disturbance power of related equipment (except video recorders) in the   frequency range of 5.6 30MHz~1GHz

Removed the disturbance power test item   requirement. Added 1GHz-6GHz radiated disturbance field strength measurement.   30MHz-6GHz radiation disturbance field strength measurement is added for   related equipment. For FM and TV broadcast receivers, the "maximum operating   frequency" excludes the LO and tuning frequencies.

Removed the disturbance power test item   requirement,Increase the high and low frequency   radiation items, 08 products are basically tested.

Yes

2

Appendix A

4.7 Radiated power

Removed the requirement for radiated power   measurement limits for direct-to-home satellite receiver tuning units,Added   30MHz-1GHz direct-to-home satellite receiver outdoor unit radiation   disturbance field strength measurement.Removed the requirement for the   equivalent radiated power measurement limit in the radiated power of the   outdoor unit of the direct-to-home satellite receiver,Added 1GHz-18GHz   direct-to-home satellite receiver outdoor unit radiation disturbance field   strength measurement(Suitable for LO leakage and stray radiation outside its   antenna main beam axis ±7º)See Table A.7

No

3

/

4 Disturbance limits

Removed RMS-average detector measurement   requirement.

No

4

Appendix A

nothing

Added conducted emission requirements for   broadcast receiver tuner ports at 0.15MHz-30MHz.

This test needs to be added if the product has an FM radio receiver tuner port.

Yes

5

Appendix A

Requirements for the measurement of   fundamental and harmonics of the local oscillator of television receivers.

Only the fundamental and harmonic   measurements of the local oscillator of FM receivers are retained. For the   fundamental and harmonic of the local oscillator of television receivers, the   limits are no longer relaxed.

Check the original report, if the   fundamental wave and harmonics of the local oscillator exceed the new standard limit, the test should be supplemented after rectification.

Yes

6

Appendix A

In the 3m method radiation field strength   measurement in the 30MHz~1GHz frequency band, in the measurement step 5.7.5,   for the vertical polarization test, the antenna height is required to be   2m~4m. (mainly related to the TV receivers and FM sound receivers of the   products given in Table 5)

No special requirements, the same   horizontal polarization, the antenna height requires 1m~4m.

Mainly for 0808 category, other products   with TV/FM tuning and receiving function, the receiving antenna is in   vertical polarization, and the antenna height is changed to 1-4 meters to   move

Yes

7

Appendix A

nothing

Added limits and measurement methods for   measurements in a full anechoic chamber.

No

8

Appendix A

nothing

The limits of 10m measurement site and 3m   measurement site for frequencies of 30MHz-1GHz are given respectively.

No

9

Appendix A

nothing

It is clearly stated that the minimum test   distance for 30MHz-1GHz is 3m, and the minimum test distance for 1GHz-6GHz is   1m.

No

10

Appendix B

color bar signal

Variation in useful signal: The standard   video signal used in the test is divided into 4 levels of complexity

Digital television receivers, set-top   boxes, personal computers, DVD devices, electronic game consoles, stand-alone   monitors, etc. all use the most complex   "color bars with moving picture elements" as standard video signals

No

It can be seen from the above table that there are many places where the new GB/T 9254.1-2021 standard needs to supplement the test to the GB/T 13837-2012 standard, So basically it can be confirmed that the products changed from GB/T 13837-2012 to GB/T 9254.1-2021 need supplementary testing. And the new standard also deletes the harassment power test item.


2)08 Category Products new test items in GB/T 9254.1-2021 standard

Because the standard GB/T 13837-2012 standard is mainly for the certification of 08-type products, let's briefly summarize the test differences and requirements of the old and new standard products of 08-type typical products.

①New test items for active speakers (category 0801) and power amplifiers (category 0802)


Test Items

Applicable Ports

Project Instruction

Asymmetric (common mode) Conducted Emissions

Suitable for products with FM radio   receiver tuner port

It can be tested according to the AAN in   Appendix A8.2, or it can be tested with a current probe that meets the   requirements in A8.3

Low Frequency Radiation

Housing port

Tested with product in typical state

High Frequency Radiation

Housing port

Test when the main frequency of the   product is greater than 108MHz; if the original report has assessed   high-frequency radiation, there is no need to supplement the difference test

 

②New test items for category 0805 audio and video processing equipment (typical configuration)

 

Test Items

Applicable Ports

Project Instruction

Low Frequency Radiation

Housing port

Tested with product in typical state

High Frequency Radiation

Housing port

Test when the main frequency of the   product is greater than 108MHz; if the original report has assessed   high-frequency radiation, there is no need to supplement the difference test

 

③New test items for category 0807 power adapter (single model)

 

Test Items

Applicable Ports

Project Instruction

High Frequency Radiation

Housing port

/

 

④New test items for category 0808 TV receiver/set-top box products

 

Test Items

Applicable Ports

Project Instruction

Asymmetric (common mode) Conducted Emissions

Applicable to products with tuner port

Test with a current probe that meets the   requirements in A8.3

Low Frequency Radiation

Housing port

1-4m measurement in TV mode

 

Except for the new test items listed in the table above, the power management of category 08 products is the same as that of category 09/16 products. When the product is sold without a power adapter, it needs to be tested according to the relevant requirements in Appendix A.



3. In addition to the differences listed in the table above, there are three points that need special attention in the actual implementation of the new standard!


1)Due to the diversity of products, the specific functions and ports of the EUT should be fully considered to determine the test items. The enterprise can provide the original test report to BTL, and we will help the enterprise determine the required test items and evaluate the corresponding test costs.


2)According to GB/T 9254.1-2021 Chapter 10 "For a multi-function EUT, compliance can be demonstrated by measuring the EUT's emission when the EUT performs all its functions simultaneously, performs each function in sequence, or performs any combination of functions. ”, when the EUT cannot perform all functions at the same time, tests should be carried out in different functions and operating modes.


3)Products sold without a power adapter shall comply with the requirements in Appendix A of GB/T9254.1-2021,Which For a multifunctional EUT, compliance can be demonstrated by measuring the EUT's emissions while the EUT performs all its functions simultaneously, each function in sequence, or any combination of functions. This is mentioned in the comparison of the old and new differences above, and it needs special attention! ! !



4. Special requirements for the power supply when the old and new certificates are changed


Since the new regulations have changed the test requirements for the power supply part, and most of the power supply components in the whole product are certified power supply components, the CQC certification center is roughly divided into the following three cases for the renewal of the certificate of the whole machine:

1) For the whole machine of category 08 products, you need to wait for the internal or external power supply to complete the version change before updating the certificate.


2) For the whole machine of category 09/16 products, as long as the company can promise the following content, it can update the certificate without waiting for the power supply to complete the version change。

Promise Content:

Our company has required the suppliers of key parts to complete the revision of the GB/T 9254.1-2021 standard within the specified time limit. This product application is certified according to the GB/T 9254.1-2021 standard. If the key parts of the product are not changed as required in the follow-up, our company is willing to bear all the consequences of violation.


3) For certified products sold without adapters, According to the resolution of TC10, it is necessary to bring the power adapter to supplement the test when changing the version (preferentially use the adapter provided by the manufacturer, if the manufacturer fails to provide it, use the adapter provided by the laboratory, and specify the provider in the data report), and the power adapter is included in the auxiliary equipment.



5. Factory inspection requirements during replacement of old and new versions


1) Since the deadline for the revision of GB/T 9254.1-2021 has not been released, the inspection team can complete the inspection according to the standards stated in the existing valid certificates during the implementation of the supervision and inspection process.


2) Before the release of the safety GB 4943.1-202X standard, if the certified company has not implemented the work related to the GB/T9254.1-2021 version change, the inspector shall record it truthfully in the supervision and inspection record, and make a note on the attached page of the factory inspection report. Notify the certification company of the requirements for changing the standard version, and will not issue non-conforming items for the time being.


3) For the case that the product certificate has been updated to the new standard, but the report content has not been updated, the factory inspection will complete the inspection based on the content in the original report.


4) According to the requirements of the Standard Law: After the implementation of the new standard on July 1, the products produced and delivered by the factory must meet the requirements of the new standard. Regardless of whether the product certificate is changed or not, the production needs to comply with the requirements of the new standard.


5)  At present, the factory inspection and law enforcement requirements vary from place to place. Each manufacturer should pay attention to the sampling inspection requirements of each place and evaluate the risk!


The current implementation plan of ShenZhen is 1) as long as it is produced and shipped after July 1st, it must be tested according to the new standard; 2) if there is no production date, and there is no identification standard number, it must be tested according to the new standard;3) If there is no standard number marked on the production date, the test shall be carried out according to the marked standard;



6. EMC standard version transition problems


1)When is the deadline for the EMC version change?

Due to the approaching time for the version change of GB 4943, the CQC Certification Center has not announced the deadline for the EMC version change for the time being. This is to prevent enterprises from wasting too much resources on the certificate change. When the implementation time of the new GB 4943 regulations is confirmed, the deadline for EMC version change will also be confirmed and announced.


2)After the new standard takes effect, can products produced according to the old version continue to be shipped and sold?

It is recommended that enterprises release the products produced by the old version before July 1.


3)If the change application after July 1 does not involve a certificate change, can the application be made according to the old standard?

It does not involve the change of the certificate, and the change application can be applied according to the old standard.


4)The equipment certificate is sold with an adapter, but the power adapter is still the standard of the old version. Will it affect the replacement of the whole machine? Or must the adapter be replaced before the whole machine can be updated?

You need to change the version of the power adapter first, and then update the version of the whole machine.


5)If the product produced after 7.1 needs to be rectified to meet the new version of the standard, should the version be changed before continuing production?

After July 1, enterprises are responsible for producing products that meet the requirements of the new standard, regardless of whether the certificate is changed or not.


6)For certificates derived from the "ODM certification mode", do I need to wait for the prototype certificate to complete the standard version before changing the version?

Yes.


7)The CCC certificate of the factory derived from the "OEM certification model" has been cancelled. Can I directly apply for a new version?

The OEM derived certificate is independent, not affected by the original certificate, and can be directly changed to a replacement version

 

The above are all interpretations of the new GB/T 9254.1-2021 standard. If you have any questions, welcome to come to BTL for consultation.

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