ISO 7637-2-2011 pdf free.Road vehicles – Electrical disturbances from conduction and coupling – Part 2: Electrical transient conduction along supply lines only.
This part of ISO 7637 specifies test methods and procedures to ensure the compatibility to conducted electrical transients of equipment installed on passenger cars and commercial vehicles fitted with 12 V or 24 V electrical systems. It describes bench tests for both the injection and measurement of transients. It is applicable to all types of road vehicles independent of the propulsion system (e.g. spark ignition or diesel engine, electric motor).
Function perfomance status classification for immunity to transients is given in Annex A.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7637-1, Road vehicles — Electrical disturbances from conduction and coupling — Part 1: Definitions and general considerations
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7637-1 apply.
4 Test procedure
4.1 General
Methods for measuring the transient emission on supply lines and test methods for the immunity of devices against such transients are given. These tests, called bench tests. are performed in the laboratory.
The bench test methods, some of which require the use of the artificial network, will provide comparable results between laboratories.
A bench test method for the evaluation of the immunity of a device against supply line transients may be performed by means of a test pulse generator. This may not cover all types of transients which can occur in a vehicle; therefore, the test pulses described in 5.6 are characteristic of typical pulses.
In special cases, it may be necessary to apply additional test pulses. However, some test pulses may be omitted if a device, depending on its function or its connection, is not influenced by comparable transients in the vehicle. It is part of the vehicle manufacturer’s responsibility to define the test pulses required for a specific device.
4.2 Test temperature and supply voltages
The ambient temperature during the test shall be (23土5) °C.
The supply voltages shall be as shown in Table 1 unless other values are agreed upon by the users of this part of ISO 7637, in which case such values shall be documented in the test reports.
UA is the supply voltage defined in Table 1, which shall be measured at the output of the pulse generator.
4.3 Voltage transient emissions test
4.3.1 General
This clause defines a test procedure to evaluate automotive eiectrica na e’ectronic components br conducted emissions of transients along battery fed or switched supply lines of a device under test (DUT). A OUT which is considered a potential source of conducted disturbances should be tested according to the procedure described in this clause.
Care shall be taken to ensure that the surrounding electromagnetic environment does not interfere with the measurement set-up.
The test method applies to OUT with or without internal mechanical or electronic switch driving inductive loads.
Voltage transients from the disturbance source, the DUT, are measured using the artificial network to standardize the impedance loading on the OUT (see 5.1).
All wiring connections between the artificial network, switch, and the DUT shall be spaced (50 ± 5) mm above the metal ground plane.
The cable sizes shall be chosen in accordance with the real situation in the vehicle, i.e. the wiring shall be capable of handling the operating current of the OUT, and as agreed between vehicle manufacturer and supplier.
Grounding of the DUT case to the ground plane shall reflect the vehicle installation and shall be defined in a test plan.
If no requirements are specified in the test plan, then the OUT shall be placed on a non-conductive material (50 ± 5) mm above the ground plane.
The supply voltage jA and the disturbance voltage shall be measured (see 4.3.2 and 4.3.3 for measurement guidance) using a voltage probe (see 5.5) and an oscilloscope or waveform acquisition equipment.
For values, see Annex B.
DUT operating conditions of particular interest in the measurements are the switch-off and the exercising of the various operating modes of the OUT. Exact operating conditions of the DUT shall be specified in the test plan.ISO 7637-2 pdf download.