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AMETEK CTS
The intention of the calibration process is to check the proper function of the components, the saturation of de-
coupling chokes, the decoupling effect of the DN part, the current capability and the coupling effect of the CN
part. The coupling method described in the above paragraphs has an influence on the voltage and current wave
forms. The parameters for the calibration are defined in Table A.4.
Coupling
CWG
method
output
voltage
Common
mode CD 1
4 kV
pair 27,5 Ω
a
For CDN with more than one pair, each pair has to be calibrated separately, as described in Table A.3.
b
Coupling via gas arrestors, clamping or avalanche devices will show some switching noise on the impulse
waveform. Working with the highest possible impulse voltage will minimize their impact on measurements;
it is recommended to neglect the switching noise for the front times and duration values measurements.
c
The values shown in this table are for a CWG with ideal values. In case the CWG generates parameters
values close to the tolerances, the additional tolerances of the CDN may generate values out of tolerances
for the CWGCDN combination.
Table A.4 – Surge waveform specifications at the EUT port of the CDN for unshielded outdoor symmetrical communication lines
7.2.3. Telecom Surge waveform definition
Waveform of open circuit voltage (10/700 μs)
Open-circuit voltage
Short-circuit current
Operating manual
V
at CDN
Voltage
oc
EUT output
front time T
± 10 %
± 30 %
8 μs
4 kV
Front time Tf [μs]
Tf = 1,67 × T = 10 ± 30 %
Tf = 1,25 × Tr = 5 ± 20 %
Voltage
I
at CDN
sc
duration T
EUT ouput
f
d
± 30 %
± 20 %
250 μs
145 A
Waveform of short circuit current (5/320μs)
V 1.00
CDN 118A series
Current
front time T
duration T
f
± 30 %
3,2 μs
Duration Td [μs]
Td = Tw = 700 ± 20 %
Td = Tw = 320 ± 20 %
Current
d
± 30 %
250 μs
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