Function and Features
• The internal resistance, Ri, of the load dump test pulse generator shall be
obtained from the following relationship.
where:
– U
nom
: is the specified voltage of the alternator
– I
rated
: is the specified current at an alternator speed of 6000 min–1 (as
given in ISO 8854)
– N
act
: is the actual alternator speed, in reciprocal minutes
• The pulse is determined by the peak voltage U
n
, U
a
, the internal resistance
R
i
, and the pulse duration td; in all cases small values of U
n
are correlated
with small values of R
i
and td, and high values of U
n
with high values of R
i
and td. For the test voltage U
A
please refer to ISO16750-1.
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.
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 for the detailed operation.
U
max,dyn
test pulse
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:
Copyright © Itech Electronic Co., Ltd.
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