Test Setup For 1.2 Μs / 50 Μs Impulses - Ametek CDN 118A Series Operating Manual

AMETEK CTS
4.4. Test setup for 1.2 µs / 50 µs impulses
The energy transfer from the surge generator to the EUT is considered
to be a constant which independs from the number of lines in the cable,
equivalent to a coupling impedance of about 40 Ω. This equivalent cou-
pling impedance is split between the lines in the cable. For this reason,
the coupling resistor value used on each line in a pair is a multiple of 40
Ω. This rule applies for cables with up to 8-line (4-pair). The CDN shall
be selected to match the number of lines/pairs existing in the cable.
Rc for 4 lines: 4 x 40 Ω = 160 Ω (25 Ω +135 Ω)
4.4.1. Test setup with 4 lines Network CDN 118A-Cx-4-1
4 Data line setup:
Each of the 4 lines has an impedance of= 160 Ω
All four lines are connected by using a coupling device
(CD, see chapter 8.2.
2 Data line setup:
Two lines are switched in parallel. Each of the 2 lines has
an impedance of= 80Ω (160 Ω // 160 Ω)
L1 = (L1' // L3')
L2 = (L2' // L4')
- Line 1 and Line 2 coupled with a coupling device (CD) to the EUT output.
- Lines L1 is parallel with L3
- Lines L2 is parallel with L4
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