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对于2001年10月1日以后生产的柴油车,采用透射式烟度计作为自由加速法的烟度测量设备。透射式烟度计的准确与否直接影响着机动车排气烟度的有效控制。作为参考标准器的中性滤光片用于检定透射式烟度计。我们在机动车安全性能检测站对透射式烟度计进行周期检定中,遇到这样的问题:在用型号为NDF的中性滤光片对烟度计进行检定时,有的检测站
For diesel vehicles manufactured after October 1, 2001, a transmissive smoke meter is used as smoke acceleration measuring device for free acceleration. The accuracy of the transmissive smoke meter directly affects the effective control of the exhaust smoke of the motor vehicle. A neutral filter as a reference standard is used to test a transmissive smoke meter. We at the motor vehicle safety testing station on the transmission-type smoke meter cycle test encountered this problem: NDF neutral ND filter for the smoke meter when the test, some inspection stations