TOELLNER Electronic Instrumente GmbH
10
3.
Tests according to standard LV 148
3.1
LV 148, E48-09, Short interruptions
Fig. 6 shows the test assembly for test E48-09. The 19 mm connecting plug must be placed
as shown.
Fig. 6:
Test assembly for LV 148, E48-09
Note
The important points for test execution in line with the requirements of the standard aim at
the wiring as explained in the following:
•
The cross section of the cables must fit to the drawn current. For currents up to 100 A
please use the cables TOE 9260/22 and TOE 9260/23 (length 0.50 m) resp.
TOE 9260/24 and TOE 9260/25 (length 1.20 m).
•
The two wires from the power supply to the IN sockets of the TOE 9260 have to be laid
as closely spaced as possible (e.g. twisted) to reach minimum inductance values.
•
As long as no artificial network is applied between the power supply and the IN sockets of
the TOE 9260, the internal capacitor at the input of the TOE 9260 should be activated by
setting the DIP switch “INPUT C” to “ON”. So the shortest possible rise and fall times of
the voltage at the DUT are achieved.
•
If an artificial network between the power supply and the IN sockets of the TOE 9260 is
necessary, the internal capacitor at the input of the TOE 9260 must be deactivated by
setting the DIP switch “INPUT C” to “OFF”. In that case the two wires from the artificial
network to the IN sockets of the TOE 9260 have to be laid as closely spaced as possible
(e.g. twisted) and also kept as short as possible to get short rise and fall times at the
DUT.
•
Also the two wires from the OUT sockets of the TOE 9260 to the DUT have to be laid as
closely spaced as possible (e.g. twisted). Any additional cable inductance will act as an
inductive filter together with the resistance and / or capacitance of the DUT, which results
in increased rise and fall times measured at the DUT.
•
If the DUT has to be connected by a wiring harness or if a wiring harness is part of the
DUT, the said remarks are valid for the cables from the OUT sockets of the TOE 9260 to
the start point of the wiring harness.
