National Metrological Verification Regulations of the People's Republic of China
Scope
This procedure is applicable to the initial calibration, subsequent calibration and in-use inspection of various railway track inspection instruments (hereinafter referred to as "track inspection instruments") that use electronic and sensing technologies to dynamically measure and automatically record static geometric parameters of standard gauge railway tracks. .
JJG(铁道) 191-2006 Referenced Document
JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement