SAE J551-15:2020 pdf free

SAE J551-15:2020 pdf free.Vehicle Electromagnetic Immunity – Electrostatic Discharge (ESD)
All discharge points that can be accessed from inside the vehicle shall be tested with the 330 pF 330 Ohm (prefer) or 2000 Ohm probe at ±4, ±8, and±15 kV. Only those discharge points that can be conveniently accessed when standing outside the vehicle (this in effect lowers a person’s capacitance) and reaching inside, such as the headlight switch or the ignition switch, shall be additionally tested with the 1 50 pF 330 Ohm (prefer) or 2000 Ohm probe at ±25 kV. In this process, the ESD simulator shall be moved towards the discharge point as quickly as possible until either discharge occurs or the electrode touches the discharge point.
NOTE: Should failures occur when testing with air method, re-check by pulling and releasing the gun trigger only when gun is moved at least 0.5 m away from the discharge point. This will avoid any failures due to the radiated transient field induced by the gun relay.
Each discharge point shall be subjected to a minimum of ten (10) positive polarity and ten (10) negative polarity discharges at each voltage level. The time duration between discharges shall at least 1 s for conductive surfaces with a conductive path to vehicle ground and 5 S for nonconductive surfaces. If the material unknown, 5 s shall be used. Alternatively, the discharge points can be discharged by touching with a grounded resistor (approx.1 megohm) in case of conductive surfaces or with a grounded brush or sheet in case of nonconductive surfaces.
NOTE 1: At each voltage level, the discharge may be tested first at a single polarity and then tested with the alternate polarity.
NOTE 2: Multiple discharges to the same non-conductive area (e.g., radio bezel) may create a static charge where-upon subsequent full discharges are not possible (ie, ESD simulator voltage is at similar potential as test object). For those cases, neutralize the DUT static charge between discharges (e.g-, air ionizer).
NOTE 3: The connection of the simulator return cable to the Ground Reference and all bonding should be of low impedance. The discharge return cable of the simulator should be positioned at least 0.5 m from the DUT while the discharge is being applied. This space will minimize the influence of radiation from this cable to the test results.SAE J551-15 pdf free download.