Ametek CDN 117A Series, Operating Manual, Page: 21 / 30

AMETEK CTS CDN 117A series
Operation Manual V 1.00 21 / 30
The intention of this calibration process is to check the proper function of the components, the saturation of de-
coupling chokes, the decoupling effect of the decoupling part, the current capability and the coupling effect of
the coupling network part. The coupling method has an influence on the voltage and current wave forms. The
parameters for the calibration are defined in Table 8 of IEC 61000-4-5 Ed3.0
Coupling
method
CWG
Output
voltage
a,b,c
V oc at CDN
EUT output
± 10 %
Voltage
front time Tf
Tf = 1,67 × Tr
± 30 %
Voltage
duration Td
Td = Tw
± 30 %
I sc at CDN
EUT output
± 20 %
Current
front time Tf
Tf = 1,25 × Tr
± 30 %
Current
duration Td
Td=1,18 ×Tw
± 30 %
Leitung- PE
R = 40
Ω
CD = 0,5
μF
4 kV 4 kV 1,2
μs
38
μs
87 A 1,3
μs
13
μs
Leitung- PE
R = 40
Ω
CD = GDT
4 kV 4 kV 1,2
μs
42
μs
95 A 1.5
μs
48
μs
Leitung - Leitung
R = 40
Ω
CD = 0,5
μF
4 kV 4 kV 1,2
μs
42
μs
87 A 1,3
μs
13
μs
Leitung - Leitung
R = 40
Ω
CD = GDT
4 kV 4 kV 1,2
μs
47
μs
95 A 1.5
μs
48
μs
a
b
c
It is recommended to calibrate the CDN at the highest rated impulse voltage, as this will minimize the
effects of the switching noise generated by CLDs and GDTs. The value shown in the table is for a gen-
erator setting of 4 kV. In case the CDN is rated for another maximum impulse voltage, the calibration
shall be done at this maximum rated impulse voltage. The short-circuit peak current specification shall
be adapted accordingly. For example, if the maximum voltage is 1 kV the short-circuit current value
shown in this table shall be multiplied by 1/4.
Coupling via gas arrestors, clamping or avalanche devices will show some switching noise on the im-
pulse 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.
The values shown in this table are for a CWG with ideal values. In case the CWG generates parameter
values close to the tolerances, the additional tolerances of the CDN may generate values out of toler-
ances for the CWG CDN combination.
Table 8 – Surge waveform specifications at the EUT port of the CDN for unsymmetrical interconnection lines
6.4.3. Surge waveform definition
Waveform of open circuit voltage (1,2/50 μ s) Waveform of short circuit current (8/20 μ s)
Front time Tf [
μs]
Duration Td [
μs]
Open-circuit voltage Tf = 1,67 × T = 1,2 ± 30 % Td = Tw = 50 ± 30 %
Short-circuit current Tf = 1,25 × Tr = 8 ± 30 % Td = 1,18 × Tw = 20 ± 30 %