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 | Accuracyb | Repeatabilityb | Noiseb |
|---|---|---|---|---|---|---|
| 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 meterc (Fuel totalizer) | ṁ | 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) | ṅ | 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 metersc | ṅ | 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 |
aThe performance specifications identified in the table apply separately for rise time and fall time.
bAccuracy, 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.
cThe 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]
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