Emerging Standards for EMC Emissions & Immunity
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- Thomas Myron Townsend
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1 Emerging Standards for EMC Emissions & Immunity Requirements for Industrial, Scientific, Medical & Information Technology Equipment CE Marking requirements are the path to increased market access Powerful Globalization forces will encourage harmonized products designed for World markets rather than simply regional markets
2 Overview of Testing Requirements Emissions Immunity Conducted CISPR 11, 22 EN Radiated CISPR 11, 22 EN Power-line Harmonics / Flicker EN , -11 E. S. D. EN E.F.T. EN Surge EN
3 Emerging Test Requirements: (required in 2001) EN Lightning Strike (Surge) 7/1/01 EN Conducted R.F. Voltages 7/1/01 EN Hz Magnetic Fields 7/1/01 EN Power line slow variations 7/1/01 EN Power line Harmonics 1/1/01 EN Power line Flicker 1/1/01 EN 55011(98) Industrial, Scientific, Medical 1/1/01 EN 55022(98) Computer / Telco emissions 8/1/01 EN 55024(98) Computer / Telco immunities 7/1/01
4 EN Lightning Strike (Surge) Combination wave definitions
5 EN Lightning Strike (Surge) Telecomm (CCITT) wave definition
6 EN Lightning Strike (Surge) Test levels for Surge testing
7 EN Class 0 Class 1 Class 2 Class 3 Class 4 Class 5 Class x Lightning Strike (Surge) Installation classes for Surge testing: Well-protected electrical environment, often within a special room Partly protected electrical environment Electrical environment where cables are well separated, even at short runs Electrical environment where cables run in parallel Electrical environment where interconnects are running outdoors, along with power cables, and are used for both electronic and electric circuits Electrical environment with equipment connected to telecommunications lines & overhead power lines in rural areas Special conditions specified in the product specification
8 EN Lightning Strike (Surge)
9 EN Conducted R.F. Voltages This Standard describes the Conducted Immunity testing requirements for electrical & electronic equipment to continuos interference from intended RF transmitters operating from 150 khz - 80 MHz. (optional to 230MHz) Amplitude Modulation (AM) is applied during the test to simulate these emitters. Four coupling methods are outlined in the Standard: 1.Coupler Decoupler Networks (CDN's) 2.Direct Injection (Direct or "S" series CDN's) 3.Electromagnetic Clamp (EM Clamp) 4.Bulk Current Injection (BCI, 150 & 50 ohms) Each method requires a "calibration" to measure the required drive level for that coupling method, test level, and test setup. This "drive table" is then played back by the Computer (with 80% AM modulation) during the test run, with an appropriate dwell time (usually 3 seconds) at each frequency, and the performance of the Equipment Under Test (EUT) is monitored by the Auxiliary Equipment (AE) for failures.
10 EN Conducted R.F. Voltages When interference is applied, failures can occur in four types: Type A Type B Type C Type D No failures are observed Unit is upset, recovers when interference is removed Unit is upset, requires operator intervention to re-set Unit does not recover (damaged)
11 EN Conducted R.F. Voltages The Standard uses a logical decision tree to guide in the choice of coupling method. First, it asks; Are CDN's suitable? If a terminated CDN is inserted into the Power or I/O lines of the EUT, and those lines continue to function, then that CDN should be used on that line.
12 EN Conducted R.F. Voltages If a Coupler Decoupler Network (CDN) is not suitable, is the line shielded (screened)? If so, you may use the "S" series CDN if suitable. S series CDN (S-1)
13 EN Conducted R.F. Voltages You may also use Direct Injection (through the R-100) onto the shield (screen) of the cable under test. Separate decoupling with the Ferrite Decoupler is then recommended.
14 EN Conducted R.F. Voltages If neither of these methods is suitable, clamp injection techniques are allowed. However, injected currents must be monitored with a monitor current probe and Spectrum Analyzer for both the BCI probe (150 & 50 ohms) as well as for the EM Clamp (150 ohms) methods. The use of a Ferrite Decoupler to protect the AE is recommended for both clamp injection techniques. The test setup shall present the 150 ohm common mode impedance required in Paragraph 6.2 and the functional installation conditions as closely as possible.
15 EN Conducted R.F. Voltages Example of Clamp injection methods (EM Clamp or BCI)
16 EN Conducted R.F. Voltages Example of EM Clamp construction
17 EN Conducted R.F. Voltages To ensure the 150 ohm common mode impedance is realized, check that the following conditions of 7.2 are met: Each AE is placed on a 100mm support above the ground plane All cables touching each AE shall be provided with a Ferrite Decoupler and kept 30-50mm above the ground plane Cable lengths are kept short (< 0.3M) Terminated CDN's are used on all other AE power & I/O lines
18 EN Conducted R.F. Voltages If one or more of these conditions cannot be met, it is necessary to ensure that the common mode impedance of the AE is less than or equal to the common mode impedance of the EUT port being tested. If not, measures must be taken to lower this AE impedance, such as decoupling capacitors at the AE port, etc. Check that the following conditions are met: Each AE and EUT shall be installed in a typical, functional way The injected current shall be monitored to ensure never exceeding I (max) which equals V(emf)/150 ohms.
19 EN Conducted R.F. Voltages Test Level: Meter Reading: 1 volt (emf) (120dBuV) - (15.6dB) - (107dB) = -2.6dBm 3 volt (emf) (130dBuV) - (15.6dB) - (107dB) = 7.4dBm 10 volt (emf) (140dBuV) - (15.6dB) - (107dB) = 17.4dBm The frequency is incremented in 1% steps, and the drive level out of the Signal Generator (dbm) is adjusted to give the Power Meter readings shown above. This becomes the "drive table" played back by the Computer during the test run.
20 EN Conducted R.F. Voltages After completion of the "drive table," disconnect the Calibration Adapters from the CDN, and connect it into the test setup as shown. Notice that the EUT is elevated 100mm above the ground plane, and all EUT ports are to be fitted with terminated CDN's. The "drive table" is played back by the Computer with 80% AM modulation, and the EUT is monitored for failures.
21 EN Conducted R.F. Voltages Test Level: Meter Reading: 1 volt (emf) (120dBuV) - (15.6dB) - (107dB) = -2.6dBm 3 volt (emf) (130dBuV) - (15.6dB) - (107dB) = 7.4dBm 10 volt (emf) (140dBuV) - (15.6dB) - (107dB) = 17.4dBm The frequency is incremented in 1% steps, and the drive level out of the Signal Generator (dbm) is adjusted to give the Power Meter readings shown above. This becomes the "drive table" played back by the Computer during the test run.
22 EN Conducted R.F. Voltages NOTE: In many cases, an "S" Series CDN may be used for Direct Injection. If these are not appropriate, the R-100 and Ferrite Decoupler may be used as shown. After completion of the "drive table," disconnect the Calibration Adapters from the S series CDN or R-100, and connect it into the test setup as shown. Notice that the EUT is elevated 100mm above the ground plane, and all EUT ports are to be fitted with terminated CDN's. The "drive table" is played back by the Computer with 80% AM modulation, and the EUT is monitored for failures.
23 EN Conducted R.F. Voltages Test Level: Meter Reading: 1 volt (emf) (120dBuV) - (15.6dB) - (107dB) = -2.6dBm 3 volt (emf) (130dBuV) - (15.6dB) - (107dB) = 7.4dBm 10 volt (emf) (140dBuV) - (15.6dB) - (107dB) = 17.4dBm The frequency is incremented in 1% steps, and the drive level out of the Signal Generator (dbm) is adjusted to give the Power Meter readings shown above. This becomes the "drive table" played back by the Computer during the test run.
24 EN Conducted R.F. Voltages After completion of the "drive table," disconnect the Calibration Adapters from the EM Clamp, and connect it into the test setup as shown. Notice that the EUT is elevated 100mm above the ground plane, and all EUT ports are to be fitted with terminated CDN's. The "drive table" is played back by the Computer with 80% AM modulation, and the EUT is monitored for failures. During the test, the injected current is monitored with a monitor current probe and Spectrum Analyzer to ensure that I (max) is never exceeded.
25 EN Conducted R.F. Voltages Test Level: Meter Reading: 1 volt (emf) (120dBuV) - (15.6dB) - (107dB) = -2.6dBm 3 volt (emf) (130dBuV) - (15.6dB) - (107dB) = 7.4dBm 10 volt (emf) (140dBuV) - (15.6dB) - (107dB) = 17.4dBm The frequency is incremented in 1% steps, and the drive level out of the Signal Generator (dbm) is adjusted to give the Power Meter readings shown above. This becomes the "drive table" played back by the Computer during the test run.
26 EN Conducted R.F. Voltages After completion of the "drive table," disconnect the Calibration Adapters from the BCI probe, and connect it into the test setup as shown. Notice that the EUT & AE are elevated 100mm above the ground plane, and all EUT ports are to be fitted with terminated CDN's. The "drive table" is played back by the Computer with 80% AM modulation, and the EUT is monitored for failures. During the test, the injected current is monitored with a monitor current probe and Spectrum Analyzer to ensure that I (max) is never exceeded.
27 EN Conducted R.F. Voltages Test Level: Meter Reading: 1 volt (emf) (120dBuV) - (6 db) - (107dB) = +7.0dBm 3 volt (emf) (130dBuV) - (6 db) - (107dB) = +17.0dBm 10 volt (emf) (140dBuV) - (6 db) - (107dB) = +27.0dBm The frequency is incremented in 1% steps, and the drive level out of the Signal Generator (dbm) is adjusted to give the Power Meter readings shown above. This becomes the "drive table" played back by the Computer during the test run.
28 EN Conducted R.F. Voltages After completion of the "drive table," disconnect the Calibration Adapters from the BCI probe, and connect it into the test setup as shown. Notice that the EUT & AE are elevated 100mm above the ground plane, and all EUT ports are to be fitted with terminated CDN's. The "drive table" is played back by the Computer with 80% AM modulation, and the EUT is monitored for failures. During the test, the injected current is monitored with a monitor current probe and Spectrum Analyzer to ensure that I (max) is never exceeded.
29 EN Hz Magnetic Fields This Standard is intended to demonstrate the immunity of equipment subjected to power frequency magnetic fields related to its specific location and installation conditions. These fields are generated by currents flowing in nearby conductors or transformers near the equipment. The Standard differentiates between: Current under normal operating conditions, producing steady magnetic fields with relatively small amplitudes; Current under fault conditions, which can produce relatively high magnetic fields of short duration, until the protection devices operate Steady magnetic fields apply to all types of equipment. Short-duration magnetic fields are related to fault conditions, with the highest values applying to equipment installed in electrical plants.
30 EN Hz Magnetic Fields Severity Levels: 10 db steps (1A/m=1.26uT)
31 EN Hz Magnetic Fields Class 1: Class 2: Class 3: Class 4: Selection of the test levels Sensitive electron-beam devices are used, like monitors or electron microscopes Well-protected environment like households, offices, or hospital protected areas Protected environment like commercial, light industrial or control buildings Typical industrial environment or power control room Class 5: Severe industrial environment or switchyard areas Class x: Special environment, higher or lower than those above
32 EN Hz Magnetic Fields
33 EN Hz Magnetic Fields Test set-ups for floor-standing and table-top equipment
34 EN Hz Magnetic Fields Field Uniformity (3dB) for single & double induction coils NOTE: A uniform field cannot be generated over a GRP when the coil is within 50cm of GRP.
35 EN Hz Magnetic Fields Field Uniformity (3dB) for single induction coil with GRP return
36 EN Hz Magnetic Fields Magnetic field calibration: The voltage delivered from the AC Power Source (and hence the current in the induction coil) is adjusted to calibrate the magnetic field in the center of the coil. A narrow-band instrument with a small multi-turn loop or Hall Effect sensor is employed to calibrate the induction factor of the coil. (H/A or Field Strength / Current) The AC Power Source can be programmed to deliver the corresponding voltages for Continuos and Short-term tests. Standard induction coils: Single square (1M x 1M) - test volume (EUT) = 0.6 x 0.6 x 0.5H Double square, 0.6M separation - test volume = 0.6 x 0.6 x 1H Double square, 0.8M separation - test volume = 0.6 x 0.6 x 1.2H Single rectangular (1M x 2.6M) - test volume = 0.6 x 0.6 x 2H
37 EN Voltage dips, interrupts & variations Scope: This Standard defines the immunity test methods and levels for electrical & electronic equipment connected to the low-voltage mains for voltage dips, short interruptions, and voltage variations. It applies to all electrical & electronic equipment with rated input currents of 16 AMPS per phase, single or three-phase. (excludes DC or 400Hz networks) Voltage dips and interruptions are caused by faults in the network or installation, or by sudden, large changes in load. These phenomena are random and not always abrupt. Voltage dips simulate the effects of sudden voltage change. Rotating machines can act as generators when spinning down and prevent rapid voltage changes in some installations, hence the voltage variation tests use gradual changes in voltage.
38 EN Voltage dips, interrupts & variations
39 EN Voltage dips, interrupts & variations
40 EN Voltage dips, interrupts & variations
41 EN Voltage dips, interrupts & variations
42 EN Voltage dips, interrupts & variations Power source requirements: The generator peak inrush capability is verified using a bridge rectifier, R-C load and current probe. The maximum inrush of the EUT is also verified with the same current probe, and shall not exceed 70% of the measured inrush drive capability of the generator.
43 EN Voltage dips, interrupts & variations Output current capability of 16 A r.m.s. per phase at rated voltage. The generator should supply 23 A at 70% of rated voltage, and 40 A at 40% of rated voltage for a duration of up to 5 seconds. Voltage change at 100% output (0-16A) < 5% Voltage change at 70% output (0-23A) < 7% Voltage change at 40% output (0-40A) < 10% Abrupt load change rise (fall) time with 100 ohm load: 1uS - 5uS
44 EN Harmonic Current Emissions This Standard applies to electrical & electronic equipment drawing up to 16 Amps per phase from the public low-voltage distribution system. Classification of Equipment Class A: Balanced 3-phase & all other equipment not classified below Class B: Portable tools Class C: Lighting equipment & dimmers Class D: Special wave shape equipment
45 EN Harmonic Current Emissions Whatever their wave shape, Class B(tools), Class C(lighting) or motordriven equipment with phase angle control are not considered Class D equipment.
46 EN Harmonic Current Emissions Table 1 - Limits for Class A equipment Class B limits: multiply values above by 1.5 for harmonic current limits
47 EN Harmonic Current Emissions Class C limits for lighting equipment Class D limits for Special wave shape
48 EN Harmonic Current Emissions
49 EN Harmonic Current Emissions General Test Conditions: For equipment not covered, set controls for maximum harmonic currents. Specific Test Conditions: If possible, use the Test Conditions below for: TV Receivers Audio Amplifiers Video Cassette Recorder Lamps Luminaires Ballasts & converters Lamp Dimmers Vacuum cleaners Washers & Dryers Microwave ovens Computers Induction heaters
50 EN Voltage Fluctuations & Flicker Emissions This Standard applies to electrical & electronic equipment drawing up to 16 Amps per phase from the public low-voltage distribution system. ( VAC - 50Hz L-N) Short-term Flicker Pst is the flicker severity evaluated over a short period (about ten minutes); where Pst = 1 is the conventional threshold of irritability. Long-term Flicker Plt is the flicker severity evaluated over a long period (about two hours); using successive Pst values.
51 EN Voltage Fluctuations & Flicker Emissions Power Source Requirement: ZA= j Hz ZN= j Hz (actual R-L network to IEC 725)
52 EN Voltage Fluctuations & Flicker Emissions
53 EN Voltage Fluctuations & Flicker Emissions
54 EN Voltage Fluctuations & Flicker Emissions Specific Test Conditions: If possible, use the specific Test Conditions below for: Cookers Hot Plates Baking Ovens Grills Combinations Microwave Ovens Lighting Equipment Washing machines Tumbler Dryers Refrigerators Copiers, laser printers Vacuum cleaners Food mixers Portable tools Hairdryers Consumer Electronics Water heaters
55 EN Computer & Telecoms Emissions Changes in the new CISPR 22 (EN ): Testing to 1GHz independent of internal clock speeds LISN s used on Power lines ISN s are used on I/O lines
56 EN Computer & Telecoms Emissions ISN Specifications: Common-mode Z = 150 ohms / 0 deg. Common-mode isolation = 35-55dB Longitudinal conversion loss = 80dB CAT-3 cabling: 50-25dB CAT-5 cabling: 60-35dB other 80-55dB Isolation protects from peripheral noise Conversion loss expresses ISN balance
57 EN Computer & Telecoms Emissions Telecom port: Any analog or digital lines connecting to the telecom network, including LAN ports. Common mode emissions: Limits on voltage or current are frequency-dependent Class A: >5mV >32uA Class B: >1.6mV >10uA
58 EN Computer & Telecoms Emissions Class A commonmode emissions Class B commonmode emissions
59 EN Computer & Telecoms Emissions CDN s from EN used as ISN s:
60 EN Computer & Telecoms Emissions In-situ CDN / ISN Test setup: (coax) Measure currents Ferrite Decoupler Measure voltage with 150 ohm meter (9.6dB correction for R-100)
61 EN Computer & Telecoms Emissions Combination current & voltage probe: Measure currents Ferrite Decoupler Measure voltage with 1M oscilloscope & capacitive probing fixture
62 EN Computer & Telecoms Emissions Measurement of common mode impedance: Measure currents Ferrite Decoupler Measure common mode impedance = 50(I1/I2) (if I2 is half I1, Z=100)
63 EN Computer & Telecoms Emissions Capacitive Voltage Probe in a fixture: Measurement setup for telecoms:
64 EN Computer & Telecoms Emissions
65 EN Computer & Telecoms Emissions
66 Emerging Standards for EMC Emissions & Immunity Requirements for Industrial, Scientific, Medical & Information Technology Equipment Emissions Immunity Conducted CISPR 11, 22 EN Radiated CISPR 11, 22 EN Power-line Harmonics / Flicker EN , -11 E. S. D. EN E.F.T. EN Surge EN Conclusion: begin pre-testing now to ensure conformity in 2001
67 Emerging Standards for EMC Emissions & Immunity Acknowledgements: Conducted Immunity - Mike Heckrotte, EMC Consultant Transient Immunity - Tom Revesz, Haefely Test, Inc. Magnetic Fields - John Smith, Mallinckrodt EN Roland Gubisch, Test & Measurement World, 4/2000 Implementation Dates - Paul Rostek, NCR Contact information: Jerry Ramie Compliance Systems Corporation 2501 N. Rose Drive Placentia, CA (408) (408) FAX info@compliancesys.com
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