ASTM E816 is the standard test method for calibration of pyrheliometers by comparison to reference pyrheliometers. This test method covers two types of calibrations. One is calibration of a secondary reference pyrheliometer, and the second is transfer of calibration. This method provides calibration procedures and details the calibration hierarchy. It is especially used for reference pyrheliometers with field angles of 5 to 6 degrees.
ASTM E816 Standard Test Method for Calibration of Pyrheliometers by Comparison to Reference Pyrheliometers
What is ASTM E816?
What is the Scope of ASTM E816?
The ASTM E816 test method covers calibrating pyrheliometers by comparison to reference pyrheliometers. It uses only sunshine for calibration. Measurements from this method are used for quality control, safety assurance, performance evaluation, and research. The specifications and working capabilities of the materials can be determined. This helps specify their applications and enhance their products to meet global standards.
ASTM E816 Equipment and Sample Preparation Guide
Primary and secondary reference pyrheliometers that are not field instruments are used for calibration. Exposure of these instruments to sunlight is kept limited to calibration or intercomparisons. These reference instruments are stored in an isolated cabinet or room equipped with standard laboratory temperature and controlled humidity conditions.
Specimen size should be as per the requirements. In this case, the reference and field pyrheliometers shall be nonselective over a range from 0.3 to 4-μm wavelength.
ASTM E816 Testing Procedure and Requirements
The test apparatus is set up by mounting the self-calibrating absolute cavity pyrheliometer on the sun-tracking mount. The distance between the pyrheliometers must not exceed 20m. The instruments are then connected to the digital voltmeter. Pyrheliometers are adjusted properly, and the quartz aperture of the secondary pyrheliometer is cleaned. The output voltage and irradiance are measured within a 1-sec interval. The standard deviation of the measured values is determined, and the zero offsets of all pyrheliometers are recorded.
ASTM E816 Analysis Results and Interpretations
The calibration factors are determined by applying the equation in which E stands for the irradiance values, and V stands for the voltage signals.
FAQ
Where can I get the astm e816 tested?
You can share your astm e816 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm e816 test to various testing techniques.
How much do I need to pay for the astm e816 test?
Please contact us for a detailed quote for your astm e816 testing needs. Cost incurred to carry out different astm e816 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm e816?
The required number of samples or specimens should comply with the procedure given in the astm e816 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
How much discount can I get on the astm e816 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm e816 test?
The turnaround time for astm e816 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
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