Skip to main content
Find a Lawyer

Code of Federal Regulations Title 40. Protection of Environment § 40.1065.202 Data updating, recording, and control

Current as of January 02, 2025 | Updated by Findlaw Staff

Your test system must be able to update data, record data and control systems related to operator demand, the dynamometer, sampling equipment, and measurement instruments. Set up the measurement and recording equipment to avoid aliasing by ensuring that the sampling frequency is at least double that of the signal you are measuring, consistent with good engineering judgment;  this may require increasing the sampling rate or filtering the signal. Use data acquisition and control systems that can record at the specified minimum frequencies, as follows:

Table 1 of § 1065.202—Data Recording and Control Minimum Frequencies

Applicable test protocol section

Measured values

Minimum command and control frequency a

Minimum recording frequency bc

§ 1065.510

Speed and torque during an engine step-map

1 Hz

1 mean value per step.

§ 1065.510

Speed and torque during an engine sweep-map

5 Hz

1 Hz means.

§ 1065.514; § 1065.530

Transient duty cycle reference and feedback speeds and torques

5 Hz

1 Hz means.

§ 1065.514; § 1065.530

Steady-state and ramped-modal duty cycle reference and feedback speeds and torques

1 Hz

1 Hz.

§ 1065.520; § 1065.530; § 1065.550

Continuous concentrations of raw or dilute analyzers

1 Hz.

§ 1065.520; § 1065.530

Batch concentrations of raw or dilute analyzers

1 mean value per test interval.

§ 1065.550

§ 1065.530; § 1065.545

Diluted exhaust flow rate from a CVS with a heat exchanger upstream of the flow measurement

1 Hz.

§ 1065.530; § 1065.545

Diluted exhaust flow rate from a CVS without a heat exchanger upstream of the flow measurement

5 Hz

1 Hz means.

§ 1065.530; § 1065.545

Intake-air or raw-exhaust flow rate

1 Hz means.

§ 1065.530; § 1065.545

Dilution air flow if actively controlled (for example, a partial-flow PM sampling system) d.

5 Hz

1 Hz means.

§ 1065.530; § 1065.545

Sample flow from a CVS that has a heat exchanger

1 Hz

1 Hz.

§ 1065.530; § 1065.545

Sample flow from a CVS that does not have a heat exchanger

5 Hz

1 Hz means.

a The specifications for minimum command and control frequency do not apply for CFVs that are not using active control.

b 1 Hz means are data reported from the instrument at a higher frequency, but recorded as a series of 1 s mean values at a rate of 1 Hz.

c For CFVs in a CVS, the minimum recording frequency is 1 Hz. The minimum recording frequency does not apply for CFVs used to control sampling from a CVS utilizing CFVs.

d Dilution air flow specifications do not apply for CVS dilution air.

Previous Part of Code Next Part of Code
Back to Chapter List

Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment § 40.1065.202 Data updating, recording, and control - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-sect-40-1065-202/

FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature before relying on it for your legal needs.

Was this helpful?

Welcome to FindLaw's Cases & Codes

A free source of state and federal court opinions, state laws, and the United States Code. For more information about the legal concepts addressed by these cases and statutes, visit FindLaw’s Learn About the Law.

Go to Learn About the Law

Latest Blog Posts

For Legal Professionals

Learn About The Law

Get help with your legal needs

FindLaw’s Learn About the Law features thousands of informational articles to help you understand your options. And if you’re ready to hire an attorney, find one in your area who can help.

Go to Learn About the Law

Need to Find an Attorney?

Search our directory by legal issue

Enter information in one or both fields (Required)

Copied to clipboard