Coupling Network AF Types

For conducted immunity testing according to IEC/EN 61000-4-16 for unscreened, balanced lines

Technical specification:
Type Description
AF2-16 Frequency range: DC / 15 Hz to 150 kHz
Test level: 50 V cont.; 300 V (1sec) power frequency
EUT / AE – port: 50 V / 0.5 A
Connector EUT / AE: clamp terminal
For DC tests the capacitors are short circuited by a rocker switch
AF4-16 Test level: 50 V cont.; 300 V (1sec) power frequency
Test level: 50 V cont.
EUT / AE – port: 50 V / 0.5 A
Connector EUT / AE: clamp terminal
For DC tests the capacitors are short circuited by a rotary switch
AF8-16 Frequency range: DC / 15 Hz to 150 kHz
Test level: 50 V cont.; 300 V (1sec) power frequency
EUT / AE – port: 50 V / 0.5 A
Connector EUT / AE: clamp terminal
For DC tests the capacitors are short circuited by a rotary switch

 

 

 

 

 

 

 

 

 

COUPLING NETWORKS FOR POWERLINE CONDUCTORS
For each wire the coupling network for powerline conductors is made of a serious connection of a resistor and a capacitor. Coupling networks of each wire are connected to establish the coupling network of the corresponding M-type. Value of the capacitor is C = 1,0 μF. Value of the resistor is R = 100 x n , where n is the number Ω of the wires (n ≥ 2). Values of capacitor and resistor shall match with a limiting deviation of 1 %. For direct current tests the 1,0 μF capacitors shall be short circuited. For safety reasons coupling networks M2 and M3 are separated units for DC tests and AC tests. Short circuiting the capacitor by mistake while an alternating current is applied inevitably destroys the coupling network. Each connection which is not under test must be grounded (SW2). For this reason an isolated BNC jumper plug is included.

COUPLING NETWORKS FOR COMMUNICATION LINES
For balanced communication lines and similar lines a “T” network is used. The “T” network is made of capacitors ( C = 4,7 μF), resistors ( R = 200 Ω) and inductances (L = 2 x 38 mH / bifilar winding). All components shall match with a limiting deviation to ensure that there is no significant reduction of the differential to common mode conversion loss of the EUT .For direct current tests the 1.0 μF capacitors shall be short circuited. Each connection which is not under test must be grounded (SW2). For this reason an isolated BNC jumper plug is included.

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