This document discusses conducted emission testing. It defines radiated and conducted emissions and how to distinguish between them. It outlines the test setup for conducted emission testing according to CISPR22 and FCC Part 15B standards on power lines and input/output lines. It discusses peak, quasi-peak and average measurements and lists common conducted emission control techniques such as reducing the noise source magnitude, filtering common mode currents, and using small loop areas.

1. Conducted Emission test
- Hardik Dedaniya

2. • What is Radiated Emission?
• What is conducted Emission?
• How you can distinguish both emission?

3. • CISPR22 (For ITE product).
1) CE test on power line.
2) CE test on I/O line.
• FCC Part15B :
1) CE test on Power line.

4. CE test set up

5. GRP (Ground reference plane)

6. General wiring

7. LISN

8. Transient Limiter
• Purpose

9. Limits on Power line (CISPR22)
•

10. Limits of I/O line (CISPR22)

11. Limits power line(FCC P15)
• For Class B
• For Class A

13. Peak vs. Quasi-peak vs. Average

14. Block diagram of Receiver

15. Spectrum analyzer
Parameter ( 9 KHz to 200 MHz)
Receiver bandwidth 9 kHz
Frequency step 5 kHz
Dwell time 20 ms

16. Con. EMISSION CONTROL TECHNIQUES
• Reduce the Magnitude of the (dV/dt) Source
• Reduce the C-M Current (e.g. Filtering)
• Return the C-M Current Through a Small Loop
That Does Not Involve the External Ground
Path (Small Loop Area)
• Usually The Closer You Can Get The Control to
the Noise Source (the dV/dt Generator*) the
More Effective the Technique
* Usually the Switching Transistor/ MOV

17. Question ?

18. Thank you