AppNote38A - Application Note #38A Automotive 600V/m Radar...

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1 of 6 112009 Application Note #38A Automotive 600V/m Radar Pulse Test Solution By Jason Smith, Manager Applications Engineering There are many hazardous electrical events in the environment that can have adverse effects on the systems of a vehicle, causing potentially unsafe situations. These events can be generated by “off-vehicle” as well as “on-vehicle” sources and can either be natural or man-made. To protect against these events automobile manufacturers have developed ElectroMagnetic Compatibility (EMC) standards to test electronic components and whole vehicles. One known manmade event is the Radar Pulse used by military and airports to track aircraft. This high intensity RF field is directed up into the sky but sometimes can be detected on the surface where it could possibly affect the electronics of an automobile. Test Specifications Both General Motors (GM) and Ford auto manufacturers have developed test specifications to test automobile components against the Radar Pulse. Both specs are not identical but they are very similar. Manufacturer Spec Band Frequency Field Level Pulse modulation GM GMW3097 1.2 – 1.4 GHz 600V/m 300Hz Pulse Repetition Rate (PRR) 3 µ s Pulse Duration (PD) (3) Dwell time 1 sec FORD ES-XW7T-1A278- AC 6 7 1.2 – 1.4 GHz 2.7 – 3.1 GHz 300V/m (1) 600V/m (2) 1 Level for most electronic equipment 2 Level for selected components associated with supplemental restraints including frontal crash 3 6 µ s Pulse duration used when testing in a Reverberation Chamber Table 1: Test Level for Radar Pulse Figure 1: Automotive high field strength RF pulse timing diagram 1/PRR PD 1 sec Key 1/PRR=One Period of Pulse Repetition Rate PD=Pulse Duration
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2 of 6 112009 This test can be performed either in an A bsorber L ined S hielded E nclosure (ALSE) or a Mode tuned Reverberation chamber. In this Application Note, we will mainly focus on the ALSE method. Recently, Ford Motor Company has issued a specification change testing the 2 frequency bands listed in table 1. This application note is based on the Ford update of January 30 th 2006. Basic changes from original ES-XW7T-1A278-AC standard New 300 V/m level for most electronics. The FMC EMC department will make the decision if 600 V/m is applicable for your component. This will be checked when the test plan is submitted. New continuous pulsed field (no more 50 pulse bursts per second) New 1 second dwell time Changes to ALSE method o No ground plane used o New dielectric table requirement (wood is not acceptable) o New 1000 mm table top height o Field MUST be calibrated at peak signal levels o Changes to RF field probe calibration method Calibration with a Continuous Wave (CW) amplifier only Probe must be calibrated at 2 frequency points by a calibration lab. Probe has special positioning constraints that allow the user to read only the
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This note was uploaded on 06/07/2011 for the course EE 11 taught by Professor D during the Spring '11 term at Central Lancashire.

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AppNote38A - Application Note #38A Automotive 600V/m Radar...

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