ASTM E824 Thermocouple Transfer Calibration Testing
E824-10 deals with the transfer of calibration from reference to field radiometers so that it can be used to determine outdoor exposure. However, this method is limited to radiometers having approximately 180°field angles. Calibration from the field ratiometer may be performed as tilt if the reference radiometer is tilted on the same tilt.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM E 824 radiometer calibration transfer testing is the standard test method for the transfer of calibration from reference radiometers to field radiometers under specified solar radiation conditions. This test method specifies the calibration transfer procedures, reference instrument requirements, and methods for determining calibration factors required for the accurate transfer of radiometer calibration. This ensures that calibration transfer data for field radiometers are available to solar energy engineers, meteorological analysts, and calibration experts to accurately meet field instrument calibration and measurement traceability requirements.
Scope, Applications, and Benefits
Scope
ASTM E 824: The ASTM E 824 method of radiometer calibration transfer involves the simultaneous measurement of solar irradiance using field instruments and reference radiometers traceable to the World Radiometric Reference, with calibration transfer factors calculated from comparisons of simultaneous measurements under specified clear-sky and solar radiation conditions.
ASTM E 824 radiometer calibration transfer testing evaluates:
- Calibration transfer factor determination for field pyranometers and pyrheliometers
- Traceability of field radiometer calibration to reference instruments and World Radiometric Reference
- Instrument response consistency of field radiometers across defined solar radiation conditions
- Calibration transfer uncertainty assessment for field solar irradiance measurement instruments
- Compliance with the defined field radiometer calibration accuracy requirements for solar measurement programs
Applications
- Solar energy resource assessment programs require traceable field radiometer calibration
- Photovoltaic and solar power plant field monitoring instrument calibration transfer programs
- Meteorological station, pyranometer, and pyrheliometer field calibration transfer requirements
- Solar radiation research field instrument calibration and traceability assurance programs
- Calibration laboratories requiring ASTM E 824 radiometer calibration transfer test data
Benefits
- Provides traceable calibration transfer data for field solar radiation measurement accuracy
- Supports solar energy measurement standard compliance and field instrument assessment
- Identifies field radiometer calibration deficiencies before solar measurement programs
- Delivers traceable calibration transfer records for engineering and regulatory submissions
- Reduces measurement risk by verifying the field radiometer calibration early in instrument deployment
Test Process
Instrument Setup
Field and reference radiometers mounted and aligned under defined clear sky conditions.
1Simultaneous Irradiance Measurement
Solar irradiance measured simultaneously by reference and field radiometers under defined conditions.
2Calibration Transfer Factor Calculation
Transfer factor calculated from ratio of reference to field instrument irradiance measurements.
3Data Analysis & Reporting
Calibration transfer factor and uncertainty assessed against criteria for test compliance result.
4Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Instruments | Field pyranometers and pyrheliometers requiring calibration transfer from reference radiometers |
| Reference Instrument | Reference radiometer traceable to World Radiometric Reference standards |
| Measurement Conditions | Defined clear sky and solar radiation conditions per ASTM E 824 requirements |
| Measured Parameters | Solar irradiance ratio and calculated calibration transfer factor |
| Measured Outputs | Calibration transfer factor, measurement uncertainty, irradiance data, and test compliance result |
Instrumentation Used for Testing
- Reference radiometer traceable to the World Radiometric Reference for calibration transfer
- Solar tracker system for precise sun-pointing alignment during transfer measurement
- Data acquisition system for simultaneous irradiance signal recording
- Calibrated signal conditioning and measurement electronics for radiometer output
- Atmospheric condition monitoring instrumentation for calibration condition assessment
- Data reporting and calibration transfer factor calculation system
Results and Deliverables
- Simultaneous irradiance measurement data for reference and field radiometer instruments
- Calculated calibration transfer factor and measurement uncertainty per ASTM E 824 procedures
- Atmospheric condition records during calibration transfer measurement sessions
- Test compliance result assessed against defined field radiometer calibration accuracy requirements
- ASTM E 824 radiometer calibration transfer report
Frequently Asked Questions
ASTM E824-10 outlines steps for transferring calibration from reference radiometers to field radiometers. This ensures precise measurement of solar radiation by keeping traceability and consistency between calibrated instruments.
Calibration transfer ensures field radiometers give precise solar radiation measurements. ASTM E824-10 helps keep consistency between instruments. This supports reliable data collection for solar energy systems, meteorological studies, and environmental monitoring applications.
ASTM E824-10 applies to field radiometers that measure solar radiation. This includes pyranometers and similar instruments that need calibration transfer from reference devices to keep measurement accuracy.
ASTM E824-10 involves comparing field radiometer readings with a calibrated reference radiometer under the same environmental conditions. Then, correction factors are applied to improve measurement accuracy between the instruments.
ASTM E824-10 relies on stable environmental conditions and precise reference instruments. Results can change because of alignment errors, shifts in the atmosphere, or instrument drift that affect calibration transfer accuracy over time.
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