SAE J2039_202606

This SAE Recommended Practice provides test procedures, requirements, and guidelines for side turn signal lamps intended for use on vehicles 12 m or more in overall length, except pole trailers. Side turn signal lamps conforming to the requirements of this document may be used on other large vehicles such as trucks, truck tractors, buses, and other applications where this type of lighting device is desirable. Eliminated Table of Contents. Modified scope for harmonization with UN. Moved SAE J387 from 2.1.1 to 2.2.1. Eliminated SAE J567. Old reference no longer used. Updated addresses and websites to respective reference organizations. Added definition of Side Turn Signal Function and edited definition of Side Turn Signal Lamp for Long Vehicles for consistency with other SAE documents. Relocated note for SAE J1889 to 5.1.5.3 for consistency with other SAE documents. Modified 5.1.5.1 to use 3.05 m for consistency with other documents. Edited 5.1.5.3 and 5.1.5.4 for clarity. Subsections in 5.1.5.4.2 were added because the measurement of flashing incandescent or other sources that don’t apply PWM are able to be measured appropriately using the “peak candela” value being equal (more or less depending on heat soaking, etc.) to the “steady state” candela. This is basically like a lamp using a timed relay to turn it on and off. However, when using PWM, the “peak candela” can be magnitudes higher than the “average” value that we generally consider to be the “steady state” value of the PWM signal. An example is a flashing LED source with a 100 Hz (the frequency is not important) and a 10% duty cycle (important). Let’s say the “peak” value, similar to the 100% duty cycle version of this source (truly “on”) may be 100 cd. This means each “pulse” has a peak value of 100 cd. However, the “perceived peak” value of the source at a 10% duty cycle would basically be the equivalent PWM value measured during the “on-time” (On phase) of the flash, which would be 10 cd. The PWM “average” during the “flash” on-time should be reported, not the individual “peaks” of each PWM cycle. The “PWM Average” during the “On phase” of the flash will be correct whether it is 100% duty cycle or any other duty cycle. The suggested frequency is 300 HZ to try to avoid the human-perception problems caused by temporal light modulation/flicker. Revised 5.1.6 title to “Warpage Test.” Modified 5.3 from “lamp” to function to align with the new definitions and for consistency with other SAE documents. Edited 6.1.5.1 for clarity. Edited 6.1.5.2 for clarity. Integrated 6.2 SAE J1889 requirements into 6.1 and renumbered the following sections. Renumbered 6.5 to 6.4. Renumbered 6.5.1 and edited wording for clarification. Reworded 6.4.1 for simplicity and alignment with other SAE documents. Added 6.4.2 for better alignment with other SAE documents. Modified wording in 6.5.1 for clarity and alignment with other SAE documents. Modified 6.5.2 to clarify visibility requirements and define a minimum intensity requirement. A quantitative value of 0.3 cd was assigned to eliminate the ambiguity of a lamp being “visible”; the value was selected to align with visibility requirements defined in SAE J588. Updated Figure 1 for legibility, and eliminated footnotes 5 and 7 as redundant. Updated Figure 2 for legibility. Removed Appendix as it is no longer needed.