Road Vehicles - Electrical And Electronic Equipment For A Supply Voltage Of 42 V - Electrical Loads - ITech IT6500C Series User Manual

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3.20.3 42V Road vehicles — Electrical and electronic
equipment for a supply voltage of 42 V — Electrical loads
A test wave completely conforming to International Standard ISO21848 is built
inside the device, which can be used for the test of Electrical and electronic
equipment for a supply voltage of 42V - Electrical loads. The user can directly
and quickly recall this function during test.
U test pulse
max,dyn
Detect the function when the DUT is under maximum dynamic VoltageUmax,
dyn, and simulate the maximum dynamic Voltage of high-energy pulse raised
from throw load in 42V electrical system, where the upper limit is the protection
voltage of throw load.
Apply 1 test pulse to the DUT, as shown below:
The internal resistance, Ri, of the load dump test pulse generator shall be
obtained from the following relationship.
where:
– U : is the specified voltage of the alternator
nom
– I : is the specified current at an alternator speed of 6000 min–1 (as
rated
given in ISO 8854)
– N : is the actual alternator speed, in reciprocal minutes
act
The pulse is determined by the peak voltage U
R , and the pulse duration td; in all cases small values of U
i
with small values of R
and td. For the test voltage U
When recalling the ISO21848 waveform, to ensure the validity of the
waveform，the user needs to enable the internal load function at first and
then set the current of internal load to the maximum value. Please refer to
3.9.8 Load Function
Copyright © Itech Electronic Co., Ltd.
and td, and high values of U
i
please refer to ISO16750-1.
A
for the detailed operation.
Function and Features
, U , the internal resistance
n a
are correlated
n
with high values of R
n i
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