ISO 16750-1:2018 pdf free.Road vehicles一Environmental conditions and testing for electrical and electronic equipment一General.
6 Functional status classification
6.1 General
This element describes the functional status of a DUT during and after a test.
The minimum functional status shall be given in each test. An additional test requirement may be agreed between supplier and vehicle manufacturer.
Unwanted operations of the DUT are not allowed in any of the following classes.
6.2 Class A
All functions of the device/system perform as designed during and after the test.
6.3 Class B
All functions of the device/system perform as designed during the test. However, one or more of them may go beyond the specified tolerance. All functions return automatically to within normal limits after the test. Memory functions shall remain class A.
It shall be specified by the vehicle manufacturer which function of the DUT needs to perform as designed during the test, and which function can be beyond the specified tolerance.
6.4 Class C
One or more functions of a device/system do not perform as designed during the test but return automatically to normal operation after the test.
6.5 ClassD
One or more functions of a device/system do not perform as designed during the test and do not return
to normal operation after the test until the device/system is reset by simple “operator/use” action.
6.6 ClassE
One or more functions of a device/system do not perform as designed during and after the test and cannot be returned to proper operation without repairing or replacing the device/system.
7 Tests and requirements
7.1 General
The values specified in ISO 16750-2, ISO 16750-3, ISO 16750-4 and ISO 16750-5 cover basic requirements.
DUTs with several mounting locations shall be tested to meet the most severe requirements.
7.2 General test conditions
Unless otherwise specified, all tests shall be performed at a room temperature of (23 ± 5) C and a relative humidity of 25 % to 75 %.
The test voltages shall be as shown in Table 1 unless other values are specified in other parts of ISO 16750 or are agreed upon by the users of ISO 16750, in which case such values shall be documented in the test reports.
7.3 Test sequence
Prior to testing, a test sequence plan shall be agreed upon, stating the type, number, combination, and sequence of the individual tests. A life test shall be defined specifically to the product and to be taken into account in the test sequence plan. An example is given in Annex A.
8 Designation
8.1 Coding
Figure 1 describes the referred tests for the device(s) by a code form for technical specifications and/or other documentation.
This example shows the designation of an environment requirement for a system/component with:
— electric load requirement according to code letter A in Iso 16750-2;
— mechanical load requirement according to code letter A in ISO 16750-3;
— an operating temperature requirement according to code letter H in ISO 1675 0-4;
— a climatic requirement according to code letter A in ISO 16750-4;
— a chemical load requirement according to code letter A in ISO 16750-5; and
— a degree of protection IP6K9K according to ISO 20653.
8.2 Use of Code Z “as agreed”
The ISO 16750 series accommodates special needs and situations through the use of Code Z “upon agreement”. The use of Code Z shall be restricted to cases where the supplier and/or vehicle manufacturer determine that the conditions or tests defined in the ISO 16750 series are:
— not suitable to achieve desired product quality/reliability objectives; and/or
— not practical.
When Code Z “upon agreement” is used, the following recommendations apply:
— The rationale (reason) for not using the provided conditions or tests shall be documented.
— A complete description of the “upon agreement” condition or test should be provided.
— Data and rationale supporting the suitability of the “upon agreement” condition or test shall be provided.
— Any specific information regarding Code Z “upon agreement” contained in ISO 16750-2, Iso 1675 0-3, Iso 16750-4 or ISO 16750-5 shall be documented.
— The equipment supplier and vehicle manufacturer shall agree that the “upon agreement” documentation is adequate.ISO 16750-1 pdf download.