ANALYSIS OF EMI/EMCTESTINGS ON ELECTRICAL EQUIPMENTS SUBMITTED BY : MEENU CHAUDHARY ROLL NO.: C08533
ENVIRONMENT TEST FACILITY ETF provides a wide range of environmental simulations for product testing during storage, transportation, operation, different stages of development, qualification, acceptance and production of electronic/ electrical assemblies in order to weed out the design, fabrication and integration deficiencies and to ensure product quality. Environmental testing is used to prove product reliability, verify manufacturer claims regarding operational limitations, and determine realistic warranty terms and preparation of procedures for safe product operation
LABS IN ETFAt our environmental lab, state-of-the-art test equipments are used to simulate a variety of environmental conditions such as:
Dynamic Test Facility Dynamic testing is accomplished by introducing a forcing function into a structure, usually with some type of shaker. Alternately, a DUT (device under test) is attached to the "table" of a shaker. For relatively low frequency forcing, servo hydraulic (electro hydraulic) shakers are used. For higher frequencies, electrodynamic shakers are used. Electrodynamic vibration provides a worthwhile testing environment for transportation simulation, mechanical shock, mission profile, and Environmental Stress Screening (ESS).
3500 kgf Vibration Shake System The brief specifications of the shaker are: Frequency range : 10 to 2500 Hz Maximum force rating : 3500 KgF Payload Capacity : 250 kg Maximum acceleration : 100 g peak Maximum velocity : 1400 mm/ sec Maximum displacement : 50.8 mm peak-peak Digital Vibration Controller : Make DACTRON, Model LASER
Bump Test Machine The brief specifications of the bump test machine are: Bump duration : 6 to 16 msec Payload capacity : 250 kg Maximum acceleration : 40 g peak Bump rate : 60 to 180 bumps/ min Pulse shape : half sine
PNEUMATIC SHOCK TEST MACHINE The brief specifications of the machine are: shock duration: 6, 11, 18 & 30 msec payload capacity: 450 kg max. acceleration: 100 g peak stroke: 21 inches pulse shape: half sine, saw tooth
ISAT facility(Intensive StorageAccelerated test) The brief specifications of the chambers are: Temperature Range : 00C to 1000C with accuracy of ± 10C. Average Rate of Heating : 30C per minute over entire temperature Average Rate of Cooling : 30C per minute over entire temperature Humidity : 20 to 97% RH ± 3% RH limited by minimum dew Point of +40C in climatic range of +20 to +850C. Recorder : Eurotherm make two point strip chart recorder, 100mm chart width and 20mm per hour
CLIMATIC TEST FACILITY The brief specifications of the chambers are: Size of Chamber : 1m X 1m X 1m (inside dimension) Loading Capacity : 150 kg maximum Temperature Range : -50° C to +125° C with accuracy ±1° C Rate of change of Temp. : 4° C/minute on average Humidity Range : 15% TO 98% RH with accuracy ±3% RH.
THERMAL SHOCK CHAMBER The brief specifications of the chamber are: size: 600 x 600 x 600 (mm) payload capacity: 100 kg temp range: cold cabinet: ambient to -60°C temp range: hot cabinet: ambient to +125°C transition time: 5 to 30 seconds Temperature accuracy: ±1°C after stratification Rate of cooling/ Heating: 5°C per minute on average
VACUUM EQUIPMENT The brief specifications of the chamber are: Size: 1 m ø x 1 m (H). Vacuum : 1 mbar. Payload capacity: 250 kg.
EMI – EMC TEST FACILITY EMI-EMC facility set up in ETF to ascertain reliable performance of electronic equipments (developed in TBRL) in the electromagnetic environments. Test equipments set up in TBRL for conducting EMI-EMC tests: Conducted Susceptibility (CS01) Test Set Up Conducted Susceptibility (CS02) Test Set Up Conducted Susceptibility (CS06) Test Set Up Electrostatic discharge (ESD) Test Set Up Radiated Emission (RE01,RE02) Test Set Up Radiated Susceptibility RS103 Test Set up
ELECTROMAGNETIC CAPABILITY Electromagnetic Capability (EMC) is the branch of electrical sciences which studies the unintentional generation, propagation and reception of electromagnetic energy with reference to the unwanted effects that such an energy may induce. To this purpose, the goal of EMC is the correct operation, in the same electromagnetic environment, of different equipment which involve electromagnetic phenomena in their operation.
EMC Electromagnetic compatibility is achieved by addressing both emission and susceptibility issues, i.e., quieting the sources of interference, making the disturbance propagation path less efficient, and making the potentially victim systems less vulnerable.
EXAMPLES OF EMC Your computer interferes with FM radio reception Operating your vacuum cleaner causes "snow" on your TV Your car radio buzzes when you drive under a power line A helicopter goes out of control when it flies too close to a radio tower You pick up CB radio conversations on your stereo Your telephone is damaged by lightning-induced surges on the phone line The screen on your video display jitters when the flourescent lights are on Your new memory board is destroyed by an unseen discharge as you install it The clock on your VCR resets everytime your air conditioner kicks in Your laptop computer interferes with your aircrafts rudder control The airport radar interferes with your laptop computer display Your pacemaker picks up cellular telephone calls
ANECHOIC CHAMBER Room with no echoes To suppress electromagnetic waves Absorbers should also have résistance to humidity and should not dust into the surrounding air. Absorbers on walls and ceiling to have light reflective covers
. Ferrite tile absorber with impedance matched carbon impregnated polyurethane foam absorber Antistatic vinyl floor tiles 1/8 inch(3mm) to cover the floor panels Thick dielectric floor underlayment 1/8” (3mm) beneath the floor panels to resist moisture and maintain electrical isolation Material - Galvanized steel/ Iron.
Antennas used ANTENNA TYPES FREQUENCY RANGE FEATURES 10KHZ - 30 MHz 100 to 4,000 WattsE-Field Antennas & 100 to 500 V/m E-Fields Parallel Element, Strip Lines, Tri-Plates,Generators TEM Cell 30 MHz – 1GHz Metrology and PrecisionBiconical Antennas Standard and High Power Available in Commercial and Military gradesLog Periodic Antennas 30 MHz – 1GHz Compact Designs 100 to 2,500 Watts Standard and High Gain 1 GHz - 40 GHz Narrow and Wide BandHorn Antennas Standard and High Gain Standard and High Power Available in Commercial and Military grades. NA EMI & RF Invisible TripodsTripods, Masts and Antenna & EUT PositionersPositioners Manual Antenna Masts
Radiated Emission (RE01,RE02) RE(01)-Frequency range: 30 Hz to 100 Kz Re(02)-Frequency Range - 14 KHz to 10 GHz
Conducted Susceptibility (CS01) Test specifications: Freq range: 30 Hz to 50 KHz Amplitude: 10% of supply voltage or 5V rms Equipment used: High Power Sweep Generator Model 8850-1
Conducted Susceptibility (CS02) Specifications: 1. 50 KHz to 400 MHz 2. 1 volt rms across 50Ω Equipment used: Signal Generator - Make IFR, Model 2023A
Conducted Susceptibility (CS06) Specifications: 1. 2.5 x DC supply voltage = 70V amplitude spikes 2. 10µsec pulse width 3. 2-20 PPS (variable) Equipment used: Transient pulse Generator- Make Solar Electronics, Model 8282- I
Radiated Susceptibility RS103 using Horn antenna Frequency Range: 10 KHz-40 GHz Electric Field 50 V/m for full freq range
Electrostatic discharge (ESD) Specifications: 1. 20 KV pulses 2. 2 pulses per connector and body Equipment used: Electrostatic Discharge Simulator -Make Noiseken, Model ESS 2002
Project-EMI-EMC PERFORMANCE EVALUATIONOF electrical unit
CONDUCTED SUSCEPTIBILITY (CS02) TEST as per - 461CS.No DESCRIPTION TEST RESULTS REMARKS 1. A Sinusoidal noise (CW) of 1 V RMS,50Ω Functional tests were performed via was injected onto EUT’s power leads (Mains and Call monitoring between two EUT PASSED return) in the frequency range of 50 KHz to 400 subscribers and display of characters MHz for a duration of 300 seconds. on LCD and were found OK during PREET, INSET & POET.
CONDUCTED SUSCEPTIBILITY (CS06) TEST as per - 461CS.No. DESCRIPTION TEST RESULTS REMARKS 1. In the units, spikes of 70V amplitude, 10µsec Functional tests were performed via pulse width, 2-20 (variable) were injected on Call monitoring between two EUT PASSED EUT’s input power leads (Mains and return) subscribers and display of characters separately in parallel injection mode for duration on LCD and were found OK during of 300 seconds on each line. PREET, INSET & POET. Test configuration is shown in Annexure C.
CONDUCTED EMISSIONS (CE01) TEST as per – 461CSNo. DESCRIPTION TEST RESULTS REMARKS 1. From the unit, conducted emissions were Functional tests were performed on the monitored on the ESIB Receiver via current unit. The emission levels from unit EUT PASSED probe EZ-17 from EUT’s power leads (Mains were below the limit line as defined in and return). MIL 461C. Test configuration and test results are shown
Set up 50 T e rm in a tio n o n S ig n a l O u tp u t P o rt (O n e fo r E a ch L IS N ) L IS N Pow er EUT Leads L IS N C u rre n t P ro b e 5 cm M e a s u re m e n t R e c e iv e r D a ta R e c o rd e r
CONDUCTED EMISSIONS (CE03) TEST as per – 461CS.No DESCRIPTION TEST RESULTS REMARK S 1. From the unit A2P-01 (QT), conducted Functional tests were emissions were monitored on the ESIB performed on the unit. EUT Receiver via LISN from EUT’s power leads The emission levels PASSED (Mains and return). Test configuration and from unit were below results are shown the limit line as defined in MIL 461C.
RADIATED EMISSIONS (RE01) TEST as per – 461CS.No DESCRIPTION TEST RESULTS REMARKS 1. From the unit ULSB MK-II, Radiated Functional tests were emissions were monitored on the ESIB performed on the unit. EUT Receiver via Magnetic pick up coil HZ-10. The emission levels from PASSED Test configuration and results are shown unit were below the limit line as defined in MIL 461C.
RE01 set up Power In p u t L IS N 7 cm R e ce ivin g Loop M e a su re m e n t EUT R e ce ive r
RADIATED EMISSIONS (RE02) TEST as per – 461CS.No DESCRIPTION TEST RESULTS REMAR KS 1. From the unit, Radiated emissions were Functional tests were monitored on the ESIB Receiver via Active performed on the unit. EUT rod antenna, Biconical antenna, Log The emission levels PASSED Periodic antenna & Horn antenna. Test from unit were below configuration and results are shown. the limit line as defined in MIL 461C.
Set up of RE02 T e s t S e tu p B o n d in g B o u n d a ry S tra p ROD 80-90 cm C o u n t e r p o is e G r o u n d P la n e o r B o n d in g S t r a p f o r N o n - C o n d u c t iv e N o n - C o n d u c t iv e T a b le s T a b le F lo o r T e s t S e tu p B o u n d a ry B IC O N IC A L 120 cm 80-90 cm G ro u n d P la n e F lo o r T e s t S e tu p B o u n d a ry DOUBLE 120 cm R ID G E H O R N 80-90 cm G ro u n d P la n e F lo o r 1 m
RADIATED SUSCEPTIBILITY (RS03) TEST as per - 461CS.No DESCRIPTION TEST RESULTS REMARK S 1. In RS03 test, the unit was exposed to electric Functional tests were performed via EUT PASSED field of 1V/m for frequency range of 14 KHz to Call monitoring between two 2 MHz, field of 10V/m for 2 MHz- 30 MHz and subscribers and display of characters electric field of 5V/m for 30 MHz -1 GHz (for on LCD. Mild distortion was observed both antenna polarizations) for a duration of 300 in the band of 30-35 MHz (Vertical seconds in each band. Polarization of Biconilog Antenna). Test configuration is shown in Annexure H. Cable looms were spaced apart and reoriented. Finally, the distortion was found to be within tolerance limits and the Functional tests were found OK.