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EMC Pre-Compliance Test for Your DC-Powered Project (Part 2)

The Hardware and How to Use It

EMC Pre-Compliance Test for Your DC-Powered Project (Part 2)
EMC Pre-Compliance Test for Your DC-Powered Project (Part 2)
In our previous edition, we introduced the DC Line Impedance Stabilization Network (LISN) that Elektor and Würth Elektronik offer in the Elektor Store. This time, we take a closer look at the hardware involved and how the LISN is used for EMC pre-compliance testing of electronic designs.

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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Component list

Component list

Resistors (all SMD 0603)
R1,R13 = 820 Ω 1%
R2,R14 = 180  1%
R3,R4,R15,R16 = 680 Ω 1%
R5,R17 = 12 Ω 1%
R6,R18 = 27 Ω 1%
R7,R19 = 18 Ω 1%
R8,R20 = 910 Ω 1%
R9,R21 = 270 Ω 1%
R10,R22 = 220 Ω 1%
R11,R12,R23,R24 = 510 Ω 1%
 
Capacitors
C1,C2,C13,C14 = 470 nF 50 V SMD 0805 X7R (Würth Elektronik 885012207102)
C3,C4,C11,C12 = 100 nF 250 V SMD 1206 X7R (Würth Elektronik 885342208004)
C5,C8 = 22 uF 100 V SMD WCAP-ASLL (8x10.5) (Würth Elektronik 865060853003 or 865080853006)
C6,C7,C9,C10 = 2.2 uF 100 V SMD 1210 X7R (Würth Elektronik 885012209071)
 
Inductors
L1,L12 = 1 mH 200 mA  SMD WE-LQS 5040 (Würth Elektronik 74404054102)
L2,L3,L4,L5,L6,L7,L8,L9,L10,L11 = 1.1 uH 15000 mA SMD WE-HCI 7050 (Würth Elektronik 744314110)
 
Semiconductors
D1,D2,D3,D4,D5,D6,D7,D8 = LL4148 100 V 100 mA, SMD MiniMelf (SOD-80)
D9,D10 = TVS diode, not used/mounted
 
Others
X1,X8 = female SMA 9.52, 5 pins 180° (end launch), PCB 1.6 mm (Würth Elektronik 60312242114510)
X2,X3 = safety socket, 4 mm, jack, panel mount, 24 A, 1 kV, gold plated contacts, red (Staubli 23.3000-22)
X5,X6 = safety socket, 4 mm, jack, panel mount, 24 A, 1 kV, gold plated contacts, blue (Staubli 23.3000-23)
X7 = safety socket, 4 mm, jack, panel mount, 24 A, 1 kV, gold plated contacts, green/yellow (Staubli 23.3000-20)
X13,X14,X15,X16 = WE-SECF SMD EMI Contact Finger, 7x2.5x13mm (Würth Elektronik 331161702513)
X4 = not mounted
Case = 1590N1 diecast aluminium 121.2 x 65.5 x 39.8 mm Hammond MFG
 
PCB 210296-1 v1.0
 
Optional (to connect the LISN to the STEMlab 250-14)
4 SMA male - BNC adapters when using 2 standard BNC cables or 2 SMA cables (male-male)

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