Type of calibration or verification
| Minimum frequency a
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§ 1065.305: Accuracy, repeatability and noise | Accuracy: Not required, but recommended for initial installation. Repeatability: Not required, but recommended for initial installation.
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| Noise: Not required, but recommended for initial installation.
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§ 1065.307: Linearity verification
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| Speed: Upon initial installation, within 370 days before testing and after major maintenance.
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| Torque: Upon initial installation, within 370 days before testing and after major maintenance.
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| Electrical power, current, and voltage: Upon initial installation, within 370 days before testing and after major maintenance.b
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| Fuel mass flow rate: Upon initial installation, within 370 days before testing, and after major maintenance.
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| Fuel mass scale: Upon initial installation, within 370 days before testing, and after major maintenance.
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| DEF mass flow rate: Upon initial installation, within 370 days before testing, and after major maintenance.c
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| DEF mass scale: Upon initial installation, within 370 days before testing, and after major maintenance.
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| Intake-air, dilution air, diluted exhaust, and batch sampler flow rates: Upon initial installation, within 370 days before testing and after major maintenance.d
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| Raw exhaust flow rate: Upon initial installation, within 185 days before testing and after major maintenance.d
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| Gas dividers: Upon initial installation, within 370 days before testing, and after major maintenance.
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| Gas analyzers (unless otherwise noted): Upon initial installation, within 35 days before testing and after major maintenance.
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| FTIR and photoacoustic analyzers: Upon initial installation, within 370 days before testing and after major maintenance.
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| GC-ECD: Upon initial installation and after major maintenance.
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| PM balance: Upon initial installation, within 370 days before testing and after major maintenance.
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| Pressure, temperature, and dewpoint: Upon initial installation, within 370 days before testing and after major maintenance.
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§ 1065.308: Continuous gas analyzer system response and updating-recording verification—for gas analyzers not continuously compensated for other gas species | Upon initial installation or after system modification that would affect response.
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§ 1065.309: Continuous gas analyzer system-response and updating-recording verification—for gas analyzers continuously compensated for other gas species | Upon initial installation or after system modification that would affect response.
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§ 1065.310: Torque | Upon initial installation and after major maintenance.
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§ 1065.315: Pressure, temperature, dewpoint | Upon initial installation and after major maintenance.
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§ 1065.320: Fuel flow | Upon initial installation and after major maintenance.
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§ 1065.325: Intake flow | Upon initial installation and after major maintenance.
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§ 1065.330: Exhaust flow | Upon initial installation and after major maintenance.
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§ 1065.340: Diluted exhaust flow (CVS) | Upon initial installation and after major maintenance.
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§ 1065.341: CVS and PFD flow verification (propane check) | Upon initial installation, within 35 days before testing, and after major maintenance.e
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§ 1065.342 Sample dryer verification | For thermal chillers: Upon installation and after major maintenance. For osmotic membranes; upon installation, within 35 days of testing, and after major maintenance.
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§ 1065.345: Vacuum leak | For laboratory testing: Upon initial installation of the sampling system, within 8 hours before the start of the first test interval of each duty-cycle sequence, and after maintenance such as pre-filter changes.
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| For field testing: After each installation of the sampling system on the vehicle, prior to the start of the field test, and after maintenance such as pre-filter changes.
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§ 1065.350: CO2 NDIR H2O interference | Upon initial installation and after major maintenance.
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§ 1065.355: CO NDIR CO2 and H2O interference | Upon initial installation and after major maintenance.
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§ 1065.360: FID calibration THC FID optimization, and THC FID verification | Calibrate all FID analyzers: upon initial installation and after major maintenance.
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| Optimize and determine CH4 response for THC FID analyzers: upon initial installation and after major maintenance.
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| Verify CH4 response for THC FID analyzers: upon initial installation, within 185 days before testing, and after major maintenance.
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| Verify C2H6 response for THC FID analyzers if used for NMNEHC determination: upon initial installation, within 185 days before testing, and after major maintenance.
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§ 1065.362: Raw exhaust FID O2 interference | For all FID analyzers: upon initial installation, and after major maintenance.
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| For THC FID analyzers: upon initial installation, after major maintenance, and after FID optimization according to § 1065.360.
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§ 1065.365: Nonmethane cutter penetration | Upon initial installation, within 185 days before testing, and after major maintenance.
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§ 1065.366: Interference verification for FTIR analyzers | Upon initial installation and after major maintenance.
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§ 1065.369: H2O, CO, and CO2 interference verification for ethanol photoacoustic analyzers | Upon initial installation and after major maintenance.
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§ 1065.370: CLD CO2 and H2O quench | Upon initial installation and after major maintenance.
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§ 1065.372: NDUV HC and H2O interference | Upon initial installation and after major maintenance.
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§ 1065.375: N2O analyzer interference | Upon initial installation and after major maintenance.
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§ 1065.376: Chiller NO2 penetration | Upon initial installation and after major maintenance.
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§ 1065.378: NO2-to-NO converter conversion | Upon initial installation, within 35 days before testing, and after major maintenance.
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§ 1065.390: PM balance and weighing | Independent verification: Upon initial installation, within 370 days before testing, and after major maintenance.
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| Zero, span, and reference sample verifications: Within 12 hours of weighing, and after major maintenance.
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§ 1065.395: Inertial PM balance and weighing | Independent verification: Upon initial installation, within 370 days before testing, and after major maintenance.
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| Other verifications: Upon initial installation and after major maintenance.
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