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South Korea KS C 9814-1:2022 Standard

Comparison Between KS C 9814-1:2020 and KS C 9814-1:2022

On May 31, 2022, South Korea’s National Radio Research Agency issued Announcement No. 2022-40 stipulating that KS C 9814-1:2022, Electromagnetic compatibility (EMC) — Requirements for household appliances, electric tools and similar apparatus — Part 1: Emission, is the latest edition of South Korean emission product standard for household appliances, electric tools, and similar apparatus. KS C 9814-1:2022 is a modified version of CISPR 14-1:2020 Edition 7.0. Significant changes have been made with respect to the previous edition, KS C 9814-1:2020 (CISPR 14-1:2016). This article addresses emission requirements specified in the KS C 9814-1:2022 standard, focusing on the latest changes and deviations from the CISPR 14-1:2020 standard. 

Scope

The following equipment is explicitly included in the scope of the standard:

  • Air conditioning
  • Personal care and beauty care appliances
  • Electric fence energizers
  • Equipment incorporating radio transmit/receive functions
  • Equipment under the scope of this document making use of inductive power transfer (IPT)

Equipment making use of IPT technology is introduced in this edition. Many devices, such as electric toothbrushes, use IPT technology to recharge batteries.

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Magnetic Field Conversions

This download provides a table of magnetic field conversion factors of microvolts-per meter, gauss, picotesla, microampere-per-meter, weber per-square meter, and gamma with values of either 0 db or 1 as a starting point.

Equipment used only in an industrial environment is excluded from the scope of this standard.

Normative References

Referenced standards are now dated, as shown in Table 1.

KS C 9814-1:2020 KS C 9814-1:2022 Referenced International Standard
CISPR 16-1-1:2015 KS C 9816-1-1:2020 CISPR 16-1-1:2015
KS C 9816-1-2 KS C 9816-1-2:2021 CISPR 16-1-2:2017
CISPR 16-1-3:2004 KS C 9816-1-3:2021 CISPR 16-1-3:2004/AMD2:2020
KS C 9816-2-1 KS C 9816-2-1:2020 CISPR 16-2-1:2014/AMD1:2017
KS C 9816-2-1 KS C 9816-2-1:2020 CISPR 16-2-2:2010
KS C 9832 KS C 9832:2019 CISPR 32:2015
KS C IEC 60050-161 KS C IEC 60050-161:1990 IEC 60050-161:1990
KS C 9816-1-4 CISPR 16-1-4:2019 CISPR 16-1-4:2019
KS C 9816-2-3 CISPR 16-2-3:2016 CISPR 16-2-3:2016/AMD1:2019
IEC 60335-2-76:2002 (deleted)
KS C IEC 61000-4-20 IEC 61000-4-20:2010 IEC 61000-4-20:2010
IEC 61000-4-22 IEC 61000-4-22:2010 IEC 61000-4-22:2010

Table 1: Normative references and equivalent international standards

Terms, Definitions, and Abbreviated Terms

The following terms and definitions are added to the standard: 

  • System under test
  • Ancillary equipment
  • Associated equipment
  • Representative load
  • Representative source
  • DC powered equipment
  • Inductive power transfer (IPT)
  • IPT source (IPTS)
  • Inductive powering equipment
  • Inductive cooking appliance
  • IPT client (IPTC)
  • IPT equipment (IPTE)
  • Radio transmitter
  • Radio receiver

Terms other than those stipulated in the standard are in accordance with the provisions of the Radio Wave Act, the Enforcement Decree of the Radio Act, the electromagnetic compatibility standards, and the international and national standards related to electromagnetic compatibility.

The following abbreviations are added to the standard:

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  • AE—associated equipment
  • AuxEq—auxiliary equipment
  • EMI—electromagnetic interference
  • EUT—equipment under text
  • FSOATS—free space open area test site
  • IPT—inductive power transfer
  • IPTS—inductive power transfer source
  • IPTC—inductive power transfer client
  • IPTE—inductive power transfer equipment
  • RBW—resolution bandwidth
  • VBW—video bandwidth

Limits

Limits are specified based on the following types of equipment: tools, equipment using IPT, electric fence energizers, toys, and others. All toys are in one category, versus five categories in the previous edition.

Conducted Disturbances

Frequency spectrum of conducted emissions measurement is investigated from 9 kHz to 30 MHz. The frequency range of 9 kHz to 150 kHz applies only to equipment with active IPT functions. 

Frequency range of 150 kHz to 30 MHz applies to all equipment. The general limits for the mains ports are identical to the CISPR 32:2019 limits for Class B equipment, except for the average limits in the frequency range of 0.15 to 0.5 MHz (which is 59 dBµV to 46 dBµV). 

For the discontinuous disturbances on the mains port, with click rate (N) less than 30, the click limit, in the frequency range of 150 kHz to 30 MHz, is calculated by increasing the relevant quasi-peak limit for the continuous disturbances by 44 dB (for N < 0.2) or 20 lg (30/N) dB (for 0.2 ≤ N < 30). 

Radiated Disturbances

Frequency spectrum of radiated disturbances measurement is investigated from 30 MHz to 1 GHz, 2 GHz, 5 GHz, or 6 GHz, depending on the highest clock frequency contained in the equipment under test (EUT).

KS C 9814-1 does not specify the fully anechoic room (FAR) testing method for the radiated disturbances measurement. For the frequency range of 30 MHz to 1 GHz, radiated disturbances limits are specified at both 10 m and 3 m measurement distances for both open area test site (OATS) and semi-anechoic chamber (SAC) testing methods. The 3 m measurement distance applies only to the small size equipment. 

Radiated disturbances measurement for the frequency range of 1 GHz to 6 GHz is introduced in this edition. Limits are specified at a 3 m measurement distance using the free space open area test site (FSOATS) testing method. An FSOATS is a SAC or an OATS with RF absorbers on the reference ground plane (GRP).

Radiated disturbances limits are identical to the CISPR 32:2019 limits for Class B equipment.

Test Conditions

Test conditions for the following equipment are revised or added:

  • Clothes irons
  • Personal care appliances
  • Battery chargers
  • Robotic equipment
  • Equipment making use of IPT
  • Remote controls and timers

Figures

Table 2 shows the changes made to the figures.

 

Figure Number Description
CISPR 14-1:2020
KS C 9814-1:2022
CISPR 14-1:2016
KS C 9814-1:2020
1 IPT terms
1 Possible issue due to a high standard deviation when using method 7.3.3
2 Examples of test configuration
3 2 Examples of discontinuous disturbances whose duration and separation meet the definition of clicks (see 3.3.3)
4 3 Examples of discontinuous disturbances whose duration and separation meet the definition of clicks (see 3.3.3)
5 4 Flow chart for emission measurements of mains operated equipment in the frequency range from 30 MHz to 1,000 MHz
6 5 Flow chart for emission testing of battery-operated equipment in the frequency range from 30 MHz to 1,000 MHz
7 Flow chart for emission measurements in the frequency range from 1 GHz to 6 GHz
6 Flow diagram for measurements of discontinuous disturbance
8 Flow diagram for the evaluation of discontinuous disturbance, based on measuring the clicks
9 Flow diagram for the evaluation of discontinuous disturbance, based on counting the switching operations
10 7 Artificial hand – RC element
11 8 Application of the artificial hand – Portable electric drill
12 9 Application of the artificial hand – Portable electric saw
13 10 Cable bundling
14 11 Voltage probe measurement for mains-powered EUT
15 12 Radiated emission – Location of the EUT on the turntable and measuring distance
16 13 Radiated emission – Example of test set-up for table-top EUT
17 14 Radiated emission – Example of test set-up for table-top EUT
18 15 Radiated emission – Example of test set-up for table-top EUT (top view)
19 16 Radiated emission – Example of test set-up for floor-standing EUT
20 17 Radiated emission – Example of the test set-up for an EUT made of multiple table-top parts
21 18 Radiated emission – Example of the test set-up for an EUT in SAC or OATS, made of a combination of table-top and floor standing parts
22 19 Radiated emission – Height of the EUT in the FAR
23 Example of test setup for disturbance voltage measurements on table-top EUT (horizontal RGP)
24 Example of alternative test setup (vertical RGP) for measurements on table-top EUT (disturbance voltage on mains port and disturbance current on auxiliary port)
25 Example of disturbance voltage measurement arrangement for floor standing EUT(s)

Table 2: Figure number comparison

Tables

Table 3 shows the changes made to the tables.

 

Table Number Description
CISPR 14-1:2020
KS C 9814-1:2022
CISPR 14-1:2016
KS C 9814-1:2020
1 1 Application of limits
2 Disturbance voltage limits for the AC mains port of equipment with active IPT functions
2 Disturbance voltage limits for induction cooking appliances
3 3 Magnetic field strength limits
4 4 Limit for the magnetic field-induced current
5 5 General limits
6 Limits for the mains port of motor-operated tools
6 Limits for mains port of tools
7 7 Disturbance power limits – 30 MHz to 300 MHz
8 8 Reduction application to Table 7 limits
9 9 Radiated disturbance limits and testing methods – 30 MHz to 1,000 MHz
10 Required highest frequency for radiated electric field strength measurements
11 Radiated electric field disturbance limits and test methods – 1 GHz to 6 GHz
A.1 Types of EUT, operating modes and test setup
B.1 B.1 Application of factor f for the determination of the click rate of special equipment
C.1 Discontinuous disturbances recorded during the first run at 500 kHz
C.2 Discontinuous disturbances recorded during the second run at 500 kHz
C.3 Discontinuous disturbances recorded during the first run at 1.4 MHz
C.4 Discontinuous disturbances recorded during the second run at 1.4 MHz
C.5 Examples of minimum observation time
D.1 11 Values of the coefficient KE as a function the sample size
D.2 10 General margin to the limit for statistical evaluation
D.3 12 Factor k for the application of the non-central t-distribution
D.4 13 Application of the binomial distribution

Table 3: Table number comparison

Conclusion

Keeping up with standard changes shortens product design cycle, speeds up product launch, and leads to success of business. This article lists key changes made to the standard to save much of research time. 

References

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