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ISO 7637-2-2011 pdf free download
ISO 7637-2-2011 pdf free download.Road vehicles Electrical disturbances from conduction and coupling
Part 2:Electrical transient conduction along supply lines only
Véhicules routiers — Perturbations electriques par conduction et par coup/age — Partie 2: Perturbations électriques transitoires par conduction uniquement le long des lignes d’alimentation.
The sampling rate and trigger level shall be selected to capture a waveform displaying the complete duration of the transient, and with sufficient resolution to display the highest positive and negative portions of the transient.
Utilising the proper sampling rate and trigger level, the voltage amplitude shall be recorded by actuating the DUT according to the test plan. Other transient parameters, such as rise time, fall time, transient duration, etc. may also be recorded. Unless otherwise specified, ten waveform acquisitions are necessary. It is necessary to report only the waveforms with the highest positive and negative amplitude (with their associated parameters).
The measured transient shall be evaluated in accordance with Annex B. All pertinent information and test results shall be reported. If required per test plan, include transient evaluation results with respect to the performance objective as specified in the test plan.
The test applies to an inductive load (such as power window, power seat, relay, electric mirror, etc.) with a large inductance o’ a high load current, which connects to the vehicle power supply, or a OUT which switches such an inductive load.
If an inductive load has a small inductance or a low load current and is driven by an internal regulated voltage (e.g. 5 V), which is isolated from the vehicle power supply, the test is not applicable unless specified in a test plan.
4.3.2 Test set-up for slow pulses
The test set-up is described in Figure 1 a).
The disturbance source is connected via the artificial network to the shunt resistor R (see 5.2), the switch S (see 5.3) and the power supply (see 5.4).
The switch S represents the main switch (e.g. ignition switch, relay, etc.) which supplies the DUT and could be located at several metres from the DUT.
In the case of a OUT having an internal mechanic and/or electronic switch driving inductive load, the test setup described in Figure 1 a) is applicable with the DUT internal switch closed (OUT inductive loads powered when opening switch S).
Depending on the DUT internal switch type (relay, electronic switches, IGBT, etc.) it may not be possible to ensure a controlled closure of the internal switch. The detail state of the internal switch(es) shall be recorded In the test report.
Transients generated by the supply disconnection of the DUT are measured at the moment of opening the switch S (the switch S is operated in order to generate transient disturbance).ISO 7637-2-2011 pdf free download.
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