radiocommunications agency ay4398 8214cr2

York EMC Services

Radiocommunications Agency AY4398 8214CR2

York EMC Services Ltd. of 29 Issue 2

CONTENTS

List of Appendices ................................................................................................................5

List of terms and abbreviations.............................................................................................6

1 Introduction...................................................................................................................7

2 EMC standards..............................................................................................................8

2.1 Harmonic Emissions .............................................................................................9

2.2 Conducted Emissions............................................................................................9

2.3 Magnetic Emissions ..............................................................................................10

2.4 Radiated Emissions...............................................................................................11

3 General Description of the Testing Layout ...................................................................12

3.1 Harmonic Emissions Test Setup ...........................................................................12

3.2 Conducted Emissions Test Setup..........................................................................12

3.3 Magnetic Emissions Test Setup ............................................................................13

3.4.1 Magnetic Loop Antenna................................................................................13

3.5.2 Van Veen Loop .............................................................................................14

3.4 Radiated Emissions Test Setup.............................................................................14

4 Information required by YES........................................................................................16

4.1 Data from measurements ......................................................................................16

4.2 Visual Recording of the Testing ...........................................................................16

4.3 Reporting of the testing.........................................................................................16

References.............................................................................................................................17

Appendix 1 Mass produced SMPS for a PC.........................................................................18

A 1.1 System Overview ....................................................................................................18

A 1.2 Technical Specification...........................................................................................18

A 1.3 Test Arrangement....................................................................................................18

A 1.4 Operating State........................................................................................................19

Appendix 2 Replacement PC SMPS.....................................................................................20







Appendix 3 DVD player .......................................................................................................22





Appendix 4 Sky Digital Box.................................................................................................23





Appendix 5 Printer................................................................................................................24





Appendix 6 Plug-in Power Supply........................................................................................25





Appendix 7 One Way Rotary Dimmer..................................................................................26





Appendix 8 Power corded Hammer Drill .............................................................................27







Appendix 9 Separate Speed Transformer .............................................................................28





Appendix 10 Courtesy Wall Light ........................................................................................29

A 10.1 System Overview ..................................................................................................29

A 10.2 Technical Specification.........................................................................................29

A 10.3 Test Arrangement..................................................................................................29

A 10.4 Operating State......................................................................................................29



LIST OF APPENDICES

Appendix 1 Mass Produced SMPS for a PC (Item 1)

Appendix 2 Replacement PC SMPS (Item 2)

Appendix 3 DVD player (Item 3)

Appendix 4 Sky Digital Box (Item 4)

Appendix 5 Printer (Item 5)

Appendix 6 Plug-in Power supply (Item 6)

Appendix 7 One way Rotary Dimmer (Item 7)

Appendix 8 Power corded Hammer Drill (Item 8)

Appendix 9 Separate speed transformer (Item 9)

Appendix 10 Courtesy Wall Light (Item 10)



LIST OF TERMS AND ABBREVIATIONS

CENELEC Comité Européen de Normalisation Electrotechnique

CISPR Comité International Spécial des Perturbations Radioélectriques

COTS Commercial Off The Shelf

DIY Do It Yourself

EMC Electromagnetic Compatibility

EMI Electromagnetic Interference

EUT Equipment Under Test

HFG01 Harmonics and Flicker Generator version 01

ITT Invitation To Tender

LISN Line Impedance Stabilisation Network

MOSFET Metal-Oxide Semiconductor Field-Effect Transistor

OATS Open Area Test Site

PC Personal Computer

RA Radiocommunications Agency

RF Radio Frequency

RTCG Radio Technology and Compatibility Group

SELCs Switched Electronic Load Controllers

SMPSs Switched Mode Power Supplies

YES York EMC Services Ltd



1 INTRODUCTION This document is the “Electromagnetic Compatibility Test Plan” for the items based on Switch Mode Power Supplies (SMPSs) and similar Switch Electronic Load Controllers (SELCs). Items have been purchased to perform a study on their emissions on the behalf of the Radiocommunications Agency (Contract Number AY 4398). A description of these items is presented in the York EMC Services Ltd Document 8202CR1 [1] previously submitted to the Agency.

The test plan identifies the EMC standards, which will be used in order that comparisons can be made between the items and defines the test methodology and how the equipment is to be configured, exercised and monitored whilst EMC testing is performed (SMPSs and SELCs technology based items). Note that although some items may have product specific standards, which are used for compliance testing, in order that direct comparisons can be made between items for the purposes of the investigation, a common standard will be used to test all items. Since the testing will be standardised and not product specific, testing will not be UKAS accredited.

The test plan is structured as follows: In the first section a list of the appropriate standards is presented with their limits and frequency ranges. The second section follows with a general description of the testing layout (for both SMPSs and SELCs technology based devices) and includes general schematic diagrams of the test setup. The third section summarises the information required by YES to perform the data analysis (data files, graphical format of pictures, etc).

Finally, each of the items has specific test plans and these are presented in the Appendices. For each of the items, the system overview, the technical specification (value of output current/voltage for each outputs), the test arrangement (with specific description of the cabling layout) and the operating state is presented. This will enable the Radio Technology and Compatibility Group (RTCG) staff to perform the relevant, agreed measurements on each of the items.

YES will provide a document to the RTCG which will detail how to test each of the EUTs with 25%, 50% and 100% load [2]. The loads will be specifically designed for each of the items.

All EMC testing will be performed at the RTCG as defined in the YES document 8130CR1 [3] and the start of the testing is planned from the 17th of February.

All EUTs and loads will be delivered at the RTCG for testing by the 12th of February.



2 EMC STANDARDS SMPSs and electrical devices containing SELCs are required to be in conformance with the EMC Directive 89/336/EEC and the implementing UK regulations SI 2372 1992. Therefore EMC testing is required and as proposed in the tender [3], the following tests will be applied to the SMPSs and SELCs purchased for this research project:

• Harmonic Emission Testing (EN61000-3-2:2000 [4])

• Conducted Emission Testing (EN55022:1998 [5])

• Radiated Magnetic Field Emission Testing (EN55011:1998 [6] and EN55015:2001 [7])

• Radiated Electric Field Emission Testing (EN55022:1998)

Details of the standards are specified below with their frequency range and limits. For the measurements of the radiated magnetic field, two tests are proposed: testing as specified by EN55011 which uses a 0.6m CISPR loop antenna and EN55015 which uses a Van Veen loop antenna. The testing will be predominantly performed as in EN55011 but for some items1 a comparative study will be performed and therefore both measurement methods will be used.

Although product specific standards related to conducted and radiated emissions are available for items such as the Hammer Drill (item 8), for the purposes of this investigation the test methods and limits will be confined to EN55022: 1998 in order that comparisons may be made.

Similarly, harmonic emission testing to EN61000-3-2: 2000 defines certain classes of device and the limits applicable. Again, in order that comparisons can be made, it is proposed that all testing will be performed to Class D specifications, including items, which are nominally excluded from testing by virtue of being less than 75W. This is the class applicable to personal computers and peripherals.

Testing to EN61000-3-3:1994 [8] flicker measurements was deemed not necessary for the purposes of this investigation. Flicker effects are related to changes in load current during the test period. During this investigation, although testing will be done at differing loads there will be no dynamic changes of load during the test.

1 It is proposed that three EUTs will be used for the comparative study (EUT with the lowest, highest and medium

emission).



2.1 Harmonic Emissions Harmonic emissions will be performed in accordance with EN61000-3-2: 2000.

Specification EN61000-3-2: 2000 Procedure EN61000-3-2: 2000

Class Frequency range Limit Limits

Standardise on Class D 0-2kHz As defined in the standard

Table 1: Specification of EN61000-3-2:2000

2.2 Conducted Emissions Conducted emissions will be performed in accordance with EN55022 Class B [5] with the extended frequency range 9kHz to 30MHz as indicated in Table 2. Note limits specified 0.15-30MHz only.

Specification EN55022:1998 Procedure EN55022:1998

Voltage limits Class B dBµV

Frequency range MHz

Quasi-peak Average 0.009-0.15 - - 0.15 to 0.5 66 to 56 56 to 46

0.5 to 5 56 46 5 to 30 60 50

Table 2: Specification of EN55022

0

10

20

30

40

50

60

70

80

90

0.1 1 10 100

Frequency (MHz)

Volta

ge (d

B µµ µµV)

Quasi PeakAverage

Figure 1: Limits of EN55022 class B for conducted emission



2.3 Magnetic Emissions Magnetic emissions will be performed in accordance with EN55011: 1998 [6] and EN55015:2001 [7] in the frequency range 9kHz to 30MHz.

Two methods will be used as mentioned earlier:

1. 0.6m magnetic loop antenna (CISPR loop) in accordance to EN55011

2. Van Veen loop measuring system (For 3m diameter loop. For loops of other diameters the limits shall be adjusted accordingly, limits also indicated for a 1.5m loop) in accordance with EN55015 (Table 3).

Specification EN55011: 1998 / EN55015: 2001 Procedure CISPR 16-2: 1999[9]

Frequency range MHz

EN55011 dBµA/m

Frequency range MHz

EN55015 dBµA

3m loop

EN55015 dBµA

1.5m loop2 0.009 to 0.070 69 0.009 to 0.070 81 91 0.07 to 0.150 69 decreasing to 39 0.070 to 0.150 81 decreasing to 51 91 decreasing to 60.25 0.150 to 2.2 39 decreasing to 3 0.150 to 2.2 51 decreasing to 22 60.25 decreasing to 29

2.2 to 3.0 2.2 to 3 51 60.25 4.0 to 30 3 to 30 15 increasing to 16 25

Table 3: Specification of EN55011 and EN55015

0

10

20

30

40

50

60

70

80

90

0.001 0.01 0.1 1 10 100

Frequency (MHz)

Mag

netic

Fie

ld S

tren

gth

EN55015 - Van Veen loop- 3m diameter (dBuA)

EN55011 - 3mmeasurement distance(dBuA/m)

Figure 2: Limits of EN55011 and EN55015 for magnetic field emission

2 The values of the limits have been extrapolated from the limits values for 2,3 and 4m loop diameter [7].



2.4 Radiated Emissions Radiated emissions will be performed in accordance with EN55022: 1998 in the frequency range 30 to 1000MHz as indicated in Table 4.

Specification EN55022: 1998 Procedure EN55022: 1998

Frequency range MHz

Quasi-peak limits Class B (10m measurement distance) dBµV/m

30 to 230 30 230 to 1000 37

Table 4: Specification of EN55022

0

10

20

30

40

50

60

70

80

90

10 100 1000

Frequency (MHz)

Mag

netic

Fie

ld S

tren

gth

(dB

µµ µµV/m

)

EN55022 - Class B

Figure 3: Limits of EN55022 for electric field emission


York EMC Services Ltd. of 29

3 GENERAL DESCRIPTION OF THE TESTING LAYOUT Since this project is based on the investigation of the EM emissions from SMPSs and SELCs, it is important that the EMC testing is performed as defined in the relevant EMC standards. Those standards have been listed in section 2. A brief description of the testing layout is presented below.

For all measurements, cables should be bundle together to minimise loop areas unless otherwise stated (In the case of a multiple output, the cables should be laid parallel to each other as a single cable).

3.1 Harmonic Emissions Test Setup The test setup will be as described in EN61000-3-2: 2000.

A “clean” AC mains supply should be used to remove any effects due to existing variations or noise on the public AC. Mains. Harmonic emissions from the unit shall be measured from 0-2kHz, i.e., up to the 40th harmonic of the AC mains 50Hz fundamental. Measurement limits are applied applicable to the class of the EUT as detailed in the standard.

It is recommended that pre-test checks shall be performed using for example a YES HFG01[10].

3.2 Conducted Emissions Test Setup The test setup will be as described in EN55022 [5]. Testing should be performed within a screened room. Details are as indicated below.

Figure 4: Typical Screened room layout for conducted emission

EUT and load (40cm from wall)

LISN

3dB or 6dB pad for matching

Measuring equipment

Feedthrough

1m mains cable

Screened roo

Issue 2

measurement

m



Figure 5: Typical setup of EUT and load(s)

3.3 Magnetic Emissions Test Setup Magnetic testing will be performed on all the items supplied using the magnetic loop antenna [6]. Subject to the results obtained using this method, comparative testing will be performed on three of the samples using a Van Veen loop measuring system [7]. The samples will be chosen by YES dependent on results obtained using the magnetic loop antenna.

3.4.1 Magnetic Loop Antenna

Figure 6: Typical test setup for the radiated magnetic field measurement

EUT

3dB or 6dB pad for

matching

Measuring equipment

Feedthrough Load

3m

EUT Load(s)

LISN

To measuring equipment



Emissions from the EUT shall be measured in both parallel and perpendicular polarisation. The 3m separation distance may be required to be shortened to 1m if insufficient levels of magnetic emissions are being measured.

3.5.2 Van Veen Loop

Figure 7: Radiated magnetic field measurement using the Van Veen loop

The EUTs and loads will be placed in the centre of the Van Veen loop and the measurements will be performed as specified in CISPR16-2 [9]

3.4 Radiated Emissions Test Setup The test setup will be as described in EN55022 [5]. Pre-compliance testing should be performed within an anechoic chamber to determine frequencies of interest. Radiated emissions from the EUT shall be measured in both horizontal and vertical polarisation and measurements performed on all sides of the EUT. Peak emissions falling within 6dB of the limit line shall be investigated using the Open Area Test Site (OATS).

EUT and load



Figure 8: Typical test setup for radiated emissions within the anechoic room at 3m separation.

Final radiated emission testing should be performed in an Open Area Test Site (OATS) at an antenna to EUT separation of 10m in accordance with EN55022, maximising the emissions on polarity, height and EUT orientation. A separation of 3m may be used if background noise makes measurement difficult at 10m. The measurement distance should be clearly recorded and test limits amended, as necessary.

3dB or 6dB pad for

matching

Measuring equipment

Feedthrough

EUT

Load

3m



4 INFORMATION REQUIRED BY YES All measurements will be performed at the RTCG laboratory while YES will be performing the data analysis. The format of the information will have to be compatible with both the RTCG and YES.

4.1 Data from measurements A large number of measurements will be taken over the period of testing and it is necessary that the format in which the data will be saved is “readable” by YES.

All data supplied to YES should take into account of the antenna factor and loss due to cable attenuation. The preferred format is Excel type (version 1998 or 2000) format with proper annotation of the measurements performed (Type of measurement, EUT number, load values, etc).

4.2 Visual Recording of the Testing When performing EMC testing, it is important to take a visual recording of the test setup. This is usually achieved by taking photographs of the overall testing area (Chamber, OATS, EUT and measuring antennas) as well as detailed pictures specific to the EUTs. The specific pictures should include details of the relative distance (using a ruler on the side of the EUT preferably) and as well as details of the cabling layout of the EUTs. The preferred format is Joint Picture Expert Group (JPEG format).

4.3 Reporting of the testing RTCG will provide a brief MS-Word summary report for each item. The report will contain the dates of testing, equipment used, engineers name, any deviation from the test plan, any observations. An index of Excel spreadsheets and photos relevant to that equipment will also be provided.

MS-Word, Excel spreadsheets and pictures files will be kept in a folder identifying the equipment and passed on to YES in an electronic format.



REFERENCES

[1] “Investigation into the EMC emissions from off-load Switched Mode Power Supplies (SMPSs) and similar

Switched Electronic Load Controllers (SELCs), York EMC Services Ltd Document Number 8202CR1.

[2] Load Guidelines Booklet, to be provided by YES to the RTCG – YES Document Number 8217CR1.

[3] Tender for performing an investigation into the EMC emissions from off-load Switched Mode Power Supplies

and similar Switched Electronic Load Controller (SELCs), York EMC Services Ltd Document Number 8130CR1.

[4] EN61000-3-2:2000 Electromagnetic compatibility (EMC) Part3-2: Limits – Limits for harmonic current

emissions (equipment input current up to and including 16A per phase).

[5] BS EN55022:1998 Information technology equipment – Radio disturbance characteristics – Limits and methods

of measurement.

[6] EN55011: 1998 (+ Amendment A1:1999 to EN55011:1998) Industrial, scientific and medical (ISM) radio-

frequency equipment – Radio disturbance characteristics – Limits and methods of measurement.

[7] BS EN55015:2001 Limits and methods of measurement of radio disturbances characteristics of electrical

lighting and similar equipment.

[8] EN 61000-3-3:1995 “Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage changes,

voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤16A per

phase and not subject to conditional connection.

[9] CISPR 16-2:1999 “Specification of Radio disturbances and Immunity measurement apparatus and methods”

Part 2 – Methods of measurements of disturbance and immunity.

[10] AN 001 – HFG01 Application Notes (EN6100-3-2 & 3) – YES draft document.



APPENDIX 1 MASS PRODUCED SMPS FOR A PC

A 1.1 System Overview This Switch Mode Power Supply is of type ATX 250 watts (model number PW-250ATX) and has 6 outputs. The manufacturer is Power Win. Its electrical specifications are listed below.

A 1.2 Technical Specification AC Input 115V~/230V~, 10/5A 60/50Hz

DC output +3.3V +5V -5V +12V -12V +5V SB

Output current 0-15A 16-25A 0.3A 8-10A 1A 0-0.8A

A 1.3 Test Arrangement The SMPS outputs will be connected to the supplied loads as indicated. For all measurements, cables should be bundled together to minimise loop areas and also to the minimum length required to connect to the loads. The length of the cables is as defined by the EUT.

Figure 9: Schematic of test arrangement

EUT

LOADS

Multiple voltage outputs

AC input



The SMPS will have been previously modified to allow connection to the supplied loads. For this SMPS there will be 4 load boxes; 3 variable load boxes and a fixed load box. These will be arranged on the 0.8m tabletop as indicated.

Figure 10: Table layout of EUT and loads

A 1.4 Operating State Tests will be performed with loads of 25%, 50% and 100%. The load will be set as indicated in the documentation supplied with the load [2].

LOADS

EUT

Bundled cables



APPENDIX 2 REPLACEMENT PC SMPS

A 2.1 System Overview This Switch Mode Power Supply is of type ATX 12V 250 watts (model number MPT-251) and has 7 outputs. The manufacturer is Upguards Power Unit. Its electrical specifications are listed below.

A 2.2 Technical Specification AC Input 115V/230V~, 6/3A 60/50Hz

DC output +3.3V +5V -5V +12V -12V +5V SB

Output current 14A 25A 0.5A 13A 0.8A 3A

A 2.3 Test Arrangement The SMPS outputs will be connected to the supplied loads as indicated. For all measurements, cables should be bundle together to minimise loop areas and also to the minimum length required to connect to the loads. The length of the cables is as defined by the EUT.

Figure 11: Schematic of test arrangement

EUT

LOADS

Multiple voltage outputs

AC input



The SMPS will have been previously modified to allow connection to the supplied loads. For this SMPS there will be 4 load boxes; 3 variable load boxes and a fixed load box. These will be arranged on the 0.8m tabletop as indicated.



LOADS

EUT

Bundled cables



APPENDIX 3 DVD PLAYER

A 3.1 System Overview A DVD player was purchased and its Switch Mode Power Supply will be tested for this work. The player was manufactured by Acoustic Solutions and the power supply was manufactured by Fairway (model number: VA3515). The electrical specifications of the SMPS are listed below.

A 3.2 Technical Specification AC Input 100V/240V~, 0.8A 60/50Hz

DC output +5V +12V -12V -27V AC output +3.5V

Output current 1.5A 0.4A 0.1A 5mA Output current 150mA

A 3.3 Test Arrangement The SMPS outputs from the DVD player will be removed from the DVD player main circuit board and will have been previously modified to allow connection to the supplied loads. For this SMPS there will be 5 load boxes; 4 variable load boxes and a fixed load box. These will be arranged on the 0.8m tabletop as indicated. For all measurements, cables should be bundled together to minimise loop areas and also to the minimum length required to connect to the loads. The length of the cables is as defined by the EUT.



LOADS

EUT

Bundled cables



APPENDIX 4 SKY DIGITAL BOX

A 4.1 System Overview The SMPS of a Sky Digital Box will be tested for this work. The box has been manufactured by Pace. The electrical specifications of the SMPS are listed below.

A 4.2 Technical Specification AC Input 230V~, 0.3A 50Hz

DC output +3V +8V +5V -8V +20V +16V -33V

A 4.3 Test Arrangement The SMPS outputs from the Sky Digital Box will be removed from the Sky Digital Box main circuit board and will have been previously modified to allow connection to the supplied loads. For this SMPS there will be 5 load boxes; 4 variable load boxes and a fixed load box. These will be arranged on the 0.8m tabletop as indicated. For all measurements, cables should be bundled together to minimise loop areas and also to the minimum length required to connect to the loads. The length of the cables is as defined by the EUT.



LOADS

EUT

Bundled cables



APPENDIX 5 PRINTER

A 5.1 System Overview A printer was purchased and its Switch Mode Power Supply will be tested for this work. The printer was manufactured by Lexmark and the power supply was manufactured by Delta Electronics (model number: ADP-12XB REV:B). The electrical specifications of the SMPS are listed below.

A 5.2 Technical Specification AC Input 220V-240V~, 1A 60/50Hz

DC Output 30V, 0.4A

A 5.3 Test Arrangement The output from the Printer SMPS will be connected to a variable load box. This will be arranged on the 0.8m tabletop as indicated. For all measurements, cables should be bundle together to minimise loop areas. The length of the cables is as defined by the EUT.

Figure 15: Table layout of EUT and load

A 5.4 Operating State Tests will be performed with loads of 25%, 50% and 100%. The load will be set as indicated in the documentation supplied with the load [2]. For all measurements, cables should be bundle together to minimise loop areas and also to the minimum length required to connect to the loads.

LOAD

EUT



APPENDIX 6 PLUG-IN POWER SUPPLY

A 6.1 System Overview This Plug-in Power Supply is of type 003 90489 (model number N2GFSW) and has a single output. The manufacturer is Egston. Its electrical specifications are listed below.

A 6.2 Technical Specification AC Input 100V-240V~, 0.18A 60/50Hz

DC Output 12VDC, 500mA

A 6.3 Test Arrangement The output from the Plug-in Power Supply will be connected to a variable load box. This will be arranged on the 0.8m tabletop as indicated. For all measurements, cables should be bundle together to minimise loop areas and also to the minimum length required to connect to the loads. The length of the cables is as defined by the EUT.



LOAD

EUT



APPENDIX 7 ONE WAY ROTARY DIMMER

A 7.1 System Overview A one way rotary dimmer was purchased for the purpose of this study. The dimmer was manufactured by Doyle and Tratt Products Ltd. The electrical specifications of the Switch Electronic Load Controller are listed below.

A 7.2 Technical Specification AC Input 216V-253V~, 50Hz

Output Maximum load 250W and minimum load 40W

A 7.3 Test Arrangement The rotary dimmer will be loaded with up to 4 x 60W incandescent light bulbs to provide a variable load. For all measurements, cables should be bundle together to minimise loop areas and also to the minimum length required to connect to the loads.

Figure 17: Table layout of EUT and loads (Full load shown)


LOADS

EUT



APPENDIX 8 POWER CORDED HAMMER DRILL

A 8.1 System Overview A power corded hammer drill was purchased for the purpose of this study. The SELC is of type FA2-6/1BEK manufactured by Zhejiang Ruian Lida Electrical Appliance Co. Ltd. The electrical specifications of the Switch Electronic Load Controller are listed below.

A 8.2 Technical Specification AC Input 230-240V~, 50Hz

Output Maximum load 760W, 6A

A 8.3 Test Arrangement The SELC will be removed from the hammer drill and mounted in a safe non-metallic enclosure and the output modified to allow connection to the supplied load. The load will consist of a 1kW electric heater. The loading will be adjusted via the trigger and speed control and the current to the load monitored using a suitable ammeter. These will be arranged on the 0.8m tabletop as indicated. The trigger will be consisting of a tightening device (in a form of a screw) which will pressing onto the load controller in a gradual manner.



LOADMETER

EUT



APPENDIX 9 SEPARATE SPEED TRANSFORMER

A 9.1 System Overview A separate speed transformer was purchased for the purpose of this study (Model Number: MB730) and manufactured by Minicraft. The electrical specifications of the Switch Electronic Load Controller are listed below.

A 9.2 Technical Specification AC Input 230V~ 50Hz

Output 9-16V DC, 1.5A, 24VA

A 9.3 Test Arrangement The separate speed transformer will be connected to the supplied load. The load will consist of a variable load box. The loading will be adjusted via the speed control button and the current to the load monitored using a suitable ammeter These will be arranged on the 0.8m tabletop as indicated. For all measurements, cables should be bundle together to minimise loop areas and also to the minimum length required to connect to the loads.



LOADMETER



APPENDIX 10 COURTESY WALL LIGHT

A 10.1 System Overview A courtesy wall light was purchased for the purpose of this study. The SELC enables the intensity to be tuned. The electrical specifications of the Switch Electronic Load Controller are listed below.

A 10.2 Technical Specification AC Input 230V~, 50Hz

Output Maximum load 60W.

A 10.3 Test Arrangement The rotary dimmer will be loaded with single incandescent bulbs to provide the correct loading levels The bulb holder is an integral part of the EUT.



EUT and load

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