This recommended practice outlines a series of performance recommendations, which concern the whole data channel. These recommendations are not subject to any variation and all of them shall be adhered to by any agency conducting tests to this practice. However, the method of demonstrating compliance with the recommendations is flexible and can be adapted to suit the needs of the particular equipment the agency is using.
It is not intended that each recommendation be taken in a literal sense, as necessitating a single test to demonstrate that the recommendation is met. Rather, it is intended that any agency proposing to conduct tests to this practice shall be able to demonstrate that if such a single test could be and were carried out, then their equipment would meet the recommendations. This demonstration shall be undertaken on the basis of reasonable deductions from evidence in their possession, such as the results of partial tests.
In some systems it may be necessary to divide the whole channel into subsystems, for calibration and checking purposes. The recommendations have been written only for the whole channel, as this is the sole route by which subsystem performances affect the quality of the output. If it is difficult to measure the whole channel performance, which is usually the case, the test agency may treat the channel as two or more convenient subsystems. The whole channel performance could then be demonstrated on the basis of subsystem results, together with a rationale for combining the subsystem results together.
Part 1 of this recommended practice covers electronic instrumentation and Part 2 covers photographic instrumentation.
Rationale
Revisions to SAE J211 are a continuing process and are considered at each five year review. Changes were made as part of an ongoing effort of harmonization with ISO 6487 and include additional definitions, tightening of the filter corridors, procedures for verifying system performance, changes and additions to CFC recommendations, specification of transducer equivalency, and changes to data format recommendations.
The Safety Test Instrumentation Standards Committee is responsible for providing performance recommendations regarding electronic and photographic instrumentation. These recommendations are primarily reported in the document SAE J211. The goal is to achieve uniformity in instrumentation practice and in reporting test results so that there can be a basis for meaningful comparisons of test results from different sources. Specific recommendations are made for dummies used in impact testing. The committee also publishes information reports when requested, such as SAE J1733 (Sign Convention for Vehicle Crash Testing) and SAE J1727 (Injury Calculations Guidlines). Documents are continually being revised and updated. Current subcommittees are: Transducer Equivalency - Currently completing its task of specifying performance requirements for specific types of transducers. Digital Imgaing - Working on revisions to J211/2 to include performance requirements for digital imaging (video) equipment used in data recording. Sign Convention - Updating J1733 with the latest sign conventions for specific dummy load cells.
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J211/1_200707
Instrumentation for Impact Test—Part 1—Electronic Instrumentation
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Instrumentation for Impact Test—Part 1—Electronic Instrumentation
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