EM TEST CNV 504N1/N2 / 508N1/N2
Operating manual V 1.20 10 / 23
Coupling
The coupling network has to couple the interference pulses in a well defined way to the input/output lines of an
electronically system. The coupling is realized by coupling capacitors according IEC 61000-4-5.
The surges may be coupled in two different coupling modes to the lines:
Line to ground (unsymmetrical)
Line to line (symmetrical)
Coupling to signal and data lines
The coupling to I/O lines is generally realized with coupling networks different from those used for power supply lines.
The loading of the I/O lines with big coupling capacitors is mostly impossible. The data transmission may be
disturbed.
For coupling to I/O lines special couplers acc. IEC 61000-4-5 are available, with smaller coupling capacitors such as
the CNV 504 and the CNV 508 for four respectively for eight wire systems.
For much application it will be necessary to design special coupling/decoupling networks according to the
specification of the lines under test.
Coupling to Telecom Lines
The coupling to telecom lines is generally realized with other coupling networks than for power supply lines. The
loading of the telecom lines with big coupling capacitors is mostly not possible. The data transmission will probably be
disturbed.
For coupling to telecom lines special couplers as IEC 61000-4-5 are available, with smaller coupling capacitors or
gas arrestors such as the CNV 50x S1 series for 4, 6, or 8 wire systems.
For much application it will be necessary to design special coupling/decoupling networks according to the
specification of the lines under test.
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