ISO 7637-2

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ISO 7637-2 TEST OVERVIEW

Pulse 1. A simulation of transients due to supply disconnection from inductive loads; it applies to a DUT if as used in the vehicle, it remains connected directly in parallel with an inductive load.

Pulse 2a. Simulates transients due to sudden interruption of currents in a device connected in parallel with the DUT due to the inductances of the wiring harness.

Pulse 2b. Simulates transients from DC motors acting as generators after the ignition is switched off.

Pulse 3a/3b. Occurs as the result of switching processes. The characteristics of this pulse are influenced by distributed capacitance and inductance of the wiring harness.

Pulse 4. The voltage reduction caused by energizing the starter motor circuits of the internal combustion engines.

Pulse 4 variants. Most manufacturer variations of pulse four are generally much more complicated. For example Ford requires up to four arbitrary generators with four outputs to be perfectly synchronized.

Pulse 5. Simulation of a load dump transient occurring in the event of a discharged battery being disconnected while the alternator is generating charging current with other loads remaining on the alternator circuit at this moment.

Magnetic field immunity. Simulates magnetic fields generated by electric motors, daytime running lamps, etc. for DUTs with magnetically sensitive devices.

Transformer coupled sine waves. Sinusodial noise coupled on battery lines. Often referred to as ground shift.

 

SAMPLE ISO 7637-2 TEST SETUP

ISO 7637 Automotive EMC (Combustion, Electric Vehicles, Etc.)

ISO 7637-2 TEST GENERATOR

SAMPLE PULSE FROM ISO 7637-2

ISO 7637-2 AUTOMOTIVE EMC TEST EQUIPMENT
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ISO 7637-2 Categories

ISO 7637-2 Transient Pulse Generators
ISO 7637-2 Transient Pulse Generators
ISO 7637-2 Pulse 2B/4 Generators
ISO 7637-2 Pulse 2B/4 Generators
Pulse 3a, 3b
Pulse 3a, 3b

ISO 7637-2 Test Equipment, Systems & Solutions

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