This section specifies criteria that your test system must meet for updating and recording data. It also specifies criteria for controlling the systems related to driver demand, the dynamometer, sampling equipment, and measurement instruments.
Table 1 of § 1066.125 -Data Recording and Control Minimum Frequencies
Applicable section | Measured values | Minimum command and control frequencya | Minimum recording frequencyb c |
§ 1066.310 § 1066.315 | Vehicle speed | 10 Hz. | |
§ 1066.425 | Continuous concentrations of raw or dilute analyzers | 1 Hz. | |
§ 1066.425 § 1066.501 | Power analyzer | 1 Hz. | |
§ 1066.425 | Bag concentrations of raw or dilute analyzers | 1 mean value per test interval. | |
40 CFR 1065.545 § 1066.425 | Diluted exhaust flow rate from a CVS with a heat exchanger upstream of the flow measurement | 1 Hz. | |
40 CFR 1065.545 § 1066.425 | Diluted exhaust flow rate from a CVS without a heat exchanger upstream of the flow measurement | 5 Hz | 1 Hz means. |
40 CFR 1065.545 § 1066.425 | Dilution air flow if actively controlled (for example, a partial-flow PM sampling system)d | 5 Hz | 1 Hz means. |
40 CFR 1065.545 § 1066.425 | Sample flow from a CVS that has a heat exchanger | 1 Hz | 1 Hz. |
40 CFR 1065.545 § 1066.425 | Sample flow from a CVS that does not have a heat exchanger | 5 Hz | 1 Hz means. |
§ 1066.420 | Ambient temperature | 1 Hz.e | |
§ 1066.420 | Ambient humidity | 1 Hz.e | |
§ 1066.420 | Heated sample system temperatures, including PM filter face | 1 Hz. |
a CFVs that are not using active control are exempt from meeting this requirement due to their operating principle.
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. For CFVs used to control sampling from a CFV CVS, the minimum recording frequency is not applicable.
d This is not applicable to CVS dilution air.
e Unless specified elsewhere in this part or the standard-setting part. Note that this provision does not apply to soak periods where recording frequencies are not specified. For these instances, we recommend a recording frequency of [GREATER THAN EQUAL TO]0.016 Hz.
40 C.F.R. §1066.125