12BAppendix and Corrections
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13.1.4 DIPS Specification
Test Level
% U
T
Voltage
Dip/int
% U
T
Duration
(in period)
0 100 0.5*
5
10
40 60 25
50
x
70 30
Prüflevel : Spannungsunterbrüche
U
T
Test Level 70%
Dip 30%
In addition to the data showed in the figure, such as test levels, duration of the interruption, transition time,
etc., the inrush current must be tested. Electronic equipment very often contain inrush current limitation
circuits. These inrush limiting circuits are often bypassed during interrupts at the turn on part.
Consequences are defective power switching modules, or the equipment can not be turned on after the test
because the software has not made a restart etc.
So that the test will cover this aspect, the inrush current capability of the generator must be at least 500 A
peak. The verification of the generator inrush current is defined as follow:
Turn on the generator at a phase angle of 90 degrees. Using a current sensor, measure the current in a
capacitor of several µF. The measured amplitude must be equal to/or greater than 500 A. When the tester
can generate a current amplitude of 500 A, all equipment with current consuming up to 16 A can then be
tested.
If the current amplitude of 500 A is not reached, then the inrush current of the EUT must be measured. The
inrush current of the tester must be a minimum of 30 % higher than the inrush current of the EUT.
Test levels DIPS
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