Table of Contents
Advertisement
AMETEK CTS
7.
Calibration procedure as per IEC 61000-4-5 Ed3
Calibration Surge impulse (1.2/50 μs – 8/20 μs)
7.1.
7.1.1. General
Calibration measurements shall be performed as indicated in Table 9 of IEC 61000-4-5 Ed3.0 at the CDN rated
impulse voltage. The peak amplitude, the front time and duration shall be measured at the EUT output port.
7.1.2. Calibration procedure for CDNs for symmetrical interconnection lines
The inputs of the DN at the auxiliary equipment (AE) shall be short-circuited to PE for the voltage and current
measurements 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.
It is recommended that the open-circuit voltage between wires of different pairs is also measured. A differential
voltage between pairs can produce false failures in EUTs that are designed to operate in highly balanced net-
works. No limit has been proposed for this value as the tolerance is dependent upon the design of the EUT.
Surge voltage
at EUT side
Surge current
at EUT side
Residual voltage
on AE side (with pro-
tection elements)
A 40 Ω path means that the transfer impedance is always 40 Ω. This means that for coupling to 1 pair 80 Ω
*
per line or 40 Ω per pair are used, for coupling to 2 pairs 160 Ω per line or 80 Ω per pair are used, for cou-
pling to 4 pairs 320 Ω per line or 160 Ω per pair are used.
Table 9 IEC 61000-4-5 Ed3.0 Summary of calibration process for CDNs for symmetrical interconnection lines
Operating manual
Coupling
Common mode –
All lines shorted
all lines to PE
together
40 Ω path*
Peak voltage,
front time, duration
Common mode –
Single line
all lines to PE
Peak current,
40 Ω path*
front time, duration
Common mode –
Line to PE at a time
all lines to PE
peak voltage
40 Ω path*
Measuring
All lines shorted
to PE
All lines shorted
to PE
Open–circuit
V 1.00
CDN 118A series
AE side
EUT side
Open–circuit all
lines connected
together
All lines shorted to
PE
Open–circuit
18 / 26
Advertisement
Table of Contents
