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AMETEK CTS
Calibration Telecom Surge impulse (10/700 μs – 5/320 μs)
7.2.
7.2.1. General
Due to the nature of the wiring used for unshielded outdoor symmetrical communication lines (twisted pairs), the
coupling is always in common mode.
The coupling decoupling schematic is shown in IEC 61000-4-5 Ed.3.0 Figure A.4.
7.2.2. Calibration procedure for CDNs for symmetrical interconnection lines
Measurements shall be performed with the impulse applied to one coupling path at a time.
The peak amplitude, the front time and impulse duration shall be measured for the CDN at the impulse voltage
under open-circuit conditions and the current under short-circuit conditions according to (Table A.4. of IEC
61000-4-5 Ed3.0).
The inputs of the decoupling network (DN) at the AE side shall be short-circuited to PE for the impulse voltage
and impulse current measurement at the EUT output port.
The residual voltage value depends on the protection requirements of the AE. Therefore, no limits are given in
this standard.
Surge voltage
at EUT side
Surge current
at EUT side
Residual voltage
on AE side (with pro-
tection elements)
Table A.3 IEC 61000-4-5 Ed3.0– Summary of calibration process for CDNs for unshielded outdoor symmetrical communication lines
Operating manual
Coupling
Common mode –
Both lines from one
one pair to PE
pair shorted together:
peak voltage, front
time, duration
Common mode –
Both lines from one
one pair to PE
pair shorted together:
peak current, front
time, duration
Common mode –
Both lines from one
one pair to PE
pair shorted together:
peak voltage
Measuring
All used lines
shorted to PE
All used lines
shorted to PE
Open–circuit
V 1.00
CDN 118A series
AE side
EUT side
Open-circuit, both
lines from one
pair connected
together
Both lines from
one pair shorted
to PE
Open–circuit
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