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 Sec. 1065.205--Recommended Performance Specifications for Measurement Instruments--------------------------------------------------------------------------------------------------------------------------------------------------------
Complete system
Measured quantity rise time (t10 90) Recording update
Measurement instrument symbol and fall time frequency Accuracy \b\ Repeatability \b\ Noise \b\
(t90 10) \a\--------------------------------------------------------------------------------------------------------------------------------------------------------Engine speed transducer......... fn................ 1 s............... 1 Hz means........ 2% of pt. or 0.5% 1% of pt. or 0.25% 0.05% of max.
of max. of max.Engine torque transducer........ T................. 1 s............... 1 Hz means........ 2% of pt. or 1% of 1% of pt. or 0.5% 0.05% of max.
max. of max.Electrical work (active-power W................. 1 s............... 1 Hz means........ 2% of pt. or 0.5% 1% of pt. or 0.25% 0.05% of max.
meter). of max. of max.General pressure transducer (not p................. 5 s............... 1 Hz.............. 2% of pt. or 1% of 1% of pt. or 0.5% 0.1% of max.
a part of another instrument). max. of max.Atmospheric pressure meter for patmos............ 50 s.............. 5 times per hour.. 50 Pa............. 25 Pa............. 5 Pa
PM-stabilization and balance
environments.General purpose atmospheric patmos............ 50 s.............. 5 times per hour.. 250 Pa............ 100Pa............. 50 Pa
pressure meter.Temperature sensor for PM- T................. 50 s.............. 0.1 Hz............ 0.25 K............ 0.1 K............. 0.1 K
stabilization and balance
environments.Other temperature sensor (not a T................. 10 s.............. 0.5 Hz............ 0.4% of pt. K or 0.2% of pt. K or 0.1% of max.
part of another instrument). 0.2% of max K. 0.1% of max K.Dewpoint sensor for intake air, Tdew.............. 50 s.............. 0.1 Hz............ 0.25 K............ 0.1 K............. 0.02 K
PM-stabilization and balance
environments.
Other dewpoint sensor........... Tdew.............. 50 s.............. 0.1 Hz............ 1 K............... 0.5 K............. 0.1 KFuel flow meter \c\ (Fuel m................. 5 s............... 1 Hz.............. 2% of pt. or 1.5% 1% of pt. or 0.75% 0.5% of max.
totalizer). (--).............. (--).............. of max. of max.Total diluted exhaust meter n................. 1 s............... 1 Hz means........ 2% of pt. or 1.5% 1% of pt. or 0.75% 1% of max.
(CVS) \c\ (With heat exchanger (5 s)............. (1 Hz)............ of max. of max.
before meter).Dilution air, inlet air, n................. 1 s............... 1 Hz means of 5 Hz 2.5% of pt. or 1.25% of pt. or 1% of max.
exhaust, and sample flow meters samples. 1.5% of max. 0.75% of max.
\c\.Continuous gas analyzer......... x................. 5 s............... 1 Hz.............. 2% of pt. or 2% of 1% of pt. or 1% of 1% of max.
meas. meas.Batch gas analyzer.............. x................. .................. .................. 2% of pt. or 2% of 1% of pt. or 1% of 1% of max.
meas. meas.Gravimetric PM balance.......... mPM............... .................. .................. See Sec. 0.5 [micro]g
1065.790.Inertial PM balance............. mPM............... 5 s............... 1 Hz.............. 2% of pt. or 2% of 1% of pt. or 1% of 0.2% of max
meas. meas.--------------------------------------------------------------------------------------------------------------------------------------------------------\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 Sec. 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 Sec. 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]
Measurement of Engine Parameters and Ambient Conditions