[Code of Federal Regulations]
[Title 40, Volume 31]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.301]

[Page 712]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_ENGINE-TESTING PROCEDURES--Table of Contents
 
                Subpart D_Calibrations and Verifications
 
Sec.  1065.301  Overview and general provisions.


    (a) This subpart describes required and recommended calibrations and 
verifications of measurement systems. See subpart C of this part for 
specifications that apply to individual instruments.
    (b) You must generally use complete measurement systems when 
performing calibrations or verifications in this subpart. For example, 
this would generally involve evaluating instruments based on values 
recorded with the complete system you use for recording test data, 
including analog-to-digital converters. For some calibrations and 
verifications, we may specify that you disconnect part of the 
measurement system to introduce a simulated signal.
    (c) If we do not specify a calibration or verification for a portion 
of a measurement system, calibrate that portion of your system and 
verify its performance at a frequency consistent with any 
recommendations from the measurement-system manufacturer, consistent 
with good engineering judgment.
    (d) Use NIST-traceable standards to the tolerances we specify for 
calibrations and verifications. Where we specify the need to use NIST-
traceable standards, you may alternatively ask for our approval to use 
international standards that are not NIST-traceable.