ITech IT6512C User Manual page 57


The pulse is determined by the peak voltage V
the pulse duration t
values of R
test voltage U
3.21.3 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
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:
t: time (in ms)
U: Voltage (in V)
The internal resistance, Ri, of the load dump test pulse generator shall be
10 × U
R =
obtained from the following relationship
0.8 × I
i
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
; in all cases small values of V
d
and t , and high values of V
i d
please refer to ISO16750-1.
A
Note
When recall the ISO-16750-2 waveform, user need to enable the internal load function at
first. To ensure the ISO-16750-2 waveform is excellent.
the function when
Copyright© Itech Electronics Co., Ltd.
× N
nom act
× 12000min
−1
rated
, the internal resistance R
s
with high values of R
s
the DUT is
Function and Features
are correlated with small
s
and t . For the
i d
under maximum dynamic
, and
i
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