ISO 16750-4 PDF

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This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 16, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publicationAmd. The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee.

International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. This second edition cancels and replaces the first edition ISO , which has been technically revised. This part of ISO describes the climatic loads. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document including any amendments applies. The applicable temperature ranges shall be chosen from Table 1 and shall be given in the specification of the device under test DUT. For details see 5. The paint repair temperature TmaxPR can be higher than the operating temperature and shall be given in the specification of the DUT.

An applicable test shall be agreed between supplier and vehicle manufacturer. Failure mode is insufficient frost resistance, e. The operating mode of the DUT is 1.

Failure mode is electrical malfunction caused by low temperature, e. The operating mode of the DUT is 3. Failure mode is insufficient heat resistance, e. Failure mode is electrical malfunction caused by high temperature, e.

Use operating mode 3. See Figure 1. Wait at each step until the DUT has reached the new temperature. Perform functional tests operating mode 3. Switch the DUT off during transition to the next temperature. Failure mode is electrical malfunction during temperature change. NOTE This test is not intended to be a life test. Operate the DUT electrically functional test after the whole device has reached Tmin for the shortest possible duration to check the correct function of the device.

In addition, operate it electrically between min and min of the cycle see Figure 2. The changes in temperature shall correspond to the specifications given in Table 2. A permanent operation starting at Tmin would prevent this due to the electrical power dissipation. Additional drying of the test chamber air is not permitted. Perform 30 test cycles as specified. One cycle. In all these cases, use code Z. Operating mode 3. The acceleration is possible due to a much higher temperature change rate and a bigger temperature change in one cycle in comparison to real vehicle stress.

Failure modes are cracking of materials or seal failures caused by ageing and different temperature expansion coefficients. Because this test creates mechanical defects cracks , electrical operation is not required. Raise the temperature from Tmin to Tmax within 30 s or less. Keep the DUT, depending on its size and other properties, at each of these temperatures for 20 min, 40 min, 60 min or 90 min.

Use operating mode 1. See Table 4 for the number of cycles. Upon agreement, this test may be performed during the development of a DUT with opened housing or without a housing.

This happens when driving on wet roads during the winter. Failure modes are mechanical cracking of materials or seal failures caused by different temperature expansion coefficients.

An additional failure mode not addressed in 5. There are two possible methods to perform the test see 5. NOTE This is not a corrosion test. Then splash the DUT with ice water for 3 s. If the DUT is splashed in the vehicle from only one direction, splash it from this direction only while it is in an as-installed position.

If the equipment is splashed from various directions in the vehicle, then these directions shall be taken into account. In this case use a new DUT for each splash direction. If DUTs of considerable size are splashed that prove too big for one jet, arrange several jets in a row to produce a line of splash impact on the DUT.

See Figures 4 to 6. Operating mode 1. Splash on. Splash off. Operate the DUT in a hot air oven at Tmax for the specified holding time th. With the device still operating, submerge it for 5 min in an ice water tank, in a depth of more than or equal to 10 mm. This test generates corrosion similar to reality.

Failure mode is corrosion. Visual examination as detailed below shall allow identification, appearance, workmanship and finish of the item to be checked against the relevant specification. Carry out a visual examination with the naked eye, at normal strength of vision, normal colour perception, at the most favourable distance and with suitable illumination. The functional status shall be class C as defined in ISO Failure mode is electrical malfunction due to leakage currents caused by the ingress of salt water.

The duration of one cycle is 24 h. Spray the DUT for 8 h, then stop spraying for a rest period of 16 h. Operate the DUT with operating mode 3. Salt spray on. Salt spray off. Figure 7 — Test cycle for the salt spray test 5. Functional status class A is required in phases with electrical operation mode 3. The failure modes addressed are electrical malfunction s caused by moisture e.

Perform a functional test operating mode 3. Failure mode is electrical malfunction caused by moisture e. Other systems shall meet functional status class C up to the last hour and class A during the last hour. Failure mode is electrical malfunction caused by insulating corrosion products on the surface of electrical contacts.

This test is relevant for plug contacts and open switching contacts. Another failure mode is the penetration of protective paint coatings with subsequent corrosion of the structures below. The application of this test shall be stated in the specification of the DUT.

Table 4 — Codes, tests, and requirements Tests and requirements according to: 5. Recommended IP classes see Annex A. It presents the UK view on standards in Europe and at the international level.

It is incorporated by Royal Charter. RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover.

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