40 CFR § 1065.205 - Performance specifications for measurement instruments.

§ 1065.205 Performance specifications for measurement instruments.

Your test system as a whole must meet all the calibrations, verifications, and test-validation criteria specified outside this section for laboratory testing or field testing, as applicable. We recommend that your instruments meet the specifications in Table 1 of this section for all ranges you use for testing. We also recommend that you keep any documentation you receive from instrument manufacturers showing that your instruments meet the specifications in Table 1 of this section.

Table 1 of § 1065.205 - Recommended Performance Specifications for Measurement Instruments

Measurement instrument Measured quantity symbol Complete system rise time (t10-90) and fall time (t90-10) a Recording update frequency Accuracy b Repeatability b Noise b
Engine speed transducer fn 1 s 1 Hz means 2% of pt. or 0.5% of max 1% of pt. or 0.25% of max 0.05% of max.
Engine torque transducer T 1 s 1 Hz means 2% of pt. or 1% of max 1% of pt. or 0.5% of max 0.05% of max.
Electrical work (active-power meter) W 1 s 1 Hz means 2% of pt. or 0.5% of max 1% of pt. or 0.25% of max 0.05% of max.
General pressure transducer (not a part of another instrument) p 5 s 1 Hz 2% of pt. or 1% of max 1% of pt. or 0.5% of max 0.1% of max.
Atmospheric pressure meter for PM-stabilization and balance environments patmos 50 s 5 times per hour 50 Pa 25 Pa 5 Pa
General purpose atmospheric pressure meter patmos 50 s 5 times per hour 250 Pa 100Pa 50 Pa
Temperature sensor for PM-stabilization and balance environments T 50 s 0.1 Hz 0.25 K 0.1 K 0.1 K
Other temperature sensor (not a part of another instrument) T 10 s 0.5 Hz 0.4% of pt. K or 0.2% of max K 0.2% of pt. K or 0.1% of max K 0.1% of max.
Dewpoint sensor for intake air, PM-stabilization and balance environments Tdew 50 s 0.1 Hz 0.25 K 0.1 K 0.02 K
Other dewpoint sensor Tdew 50 s 0.1 Hz 1 K 0.5 K 0.1 K
Fuel flow meter c (Fuel totalizer) m 5 s
( - )
1 Hz
( - )
2% of pt. or 1.5% of max 1% of pt. or 0.75% of max 0.5% of max.
Total diluted exhaust meter (CVS) c (With heat exchanger before meter) n 1 s
(5 s)
1 Hz means
(1 Hz)
2% of pt. or 1.5% of max 1% of pt. or 0.75% of max 1% of max.
Dilution air, inlet air, exhaust, and sample flow meters c n 1 s 1 Hz means of 5 Hz samples 2.5% of pt. or 1.5% of max 1.25% of pt. or 0.75% of max 1% of max.
Continuous gas analyzer x 5 s 1 Hz 2% of pt. or 2% of meas 1% of pt. or 1% of meas 1% of max.
Batch gas analyzer x 2% of pt. or 2% of meas 1% of pt. or 1% of meas 1% of max.
Gravimetric PM balance mPM See § 1065.790 0.5 µg
Inertial PM balance mPM 5 s 1 Hz 2% of pt. or 2% of meas 1% of pt. or 1% of meas 0.2% of max

a The performance specifications identified in the table apply separately for rise time and fall time.

b Accuracy, repeatability, and noise are all determined with the same collected data, as described in § 1065.305, and based on absolute values. “pt.” refers to the overall flow-weighted mean value expected at the standard; “max” refers to the peak value expected at the standard over any test interval, not the maximum of the instrument's range; “meas” refers to the actual flow-weighted mean measured over any test interval.

c The procedure for accuracy, repeatability and noise measurement described in § 1065.305 may be modified for flow meters to allow noise to be measured at the lowest calibrated value instead of zero flow rate.

[79 FR 23759, Apr. 28, 2014]