40 C.F.R. § 1065.202

Current through September 30, 2024
Section 1065.202 - Data updating, recording, and control

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
frequencya
Minimum
recording
frequencybc
§ 1065.510 Speed and torque during an engine step-map1 Hz1 mean value per step.
§ 1065.510 Speed and torque during an engine sweep-map5 Hz1 Hz means.
§ 1065.514 ; § 1065.530 Transient duty cycle reference and feedback speeds and torques5 Hz1 Hz means.
§ 1065.514 ; § 1065.530 Steady-state and ramped-modal duty cycle reference and feedback speeds and torques1 Hz1 Hz.
§ 1065.520 ; § 1065.530 ; § 1065.550 Continuous concentrations of raw or dilute analyzers1 Hz.
§ 1065.520 ; § 1065.530 § 1065.550 Batch concentrations of raw or dilute analyzers1 mean value per test interval.
§ 1065.530 ; § 1065.545 Diluted exhaust flow rate from a CVS with a heat exchanger upstream of the flow measurement1 Hz.
§ 1065.530 ; § 1065.545 Diluted exhaust flow rate from a CVS without a heat exchanger upstream of the flow measurement5 Hz1 Hz means.
§ 1065.530 ; § 1065.545 Intake-air or raw-exhaust flow rate1 Hz means.
§ 1065.530 ; § 1065.545 Dilution air flow if actively controlled (for example, a partial-flow PM sampling system)d5 Hz1 Hz means.
§ 1065.530 ; § 1065.545 Sample flow from a CVS that has a heat exchanger1 Hz1 Hz.
§ 1065.530 ; § 1065.545 Sample flow from a CVS that does not have a heat exchanger5 Hz1 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.

40 C.F.R. §1065.202

79 FR 23759, Apr. 28, 2014, as amended at 81 FR 74162, Oct. 25, 2016
81 FR 74162, 12/27/2016