Standard Guide for Nuclear Surface Moisture and Density Gauge Calibration

Importancia y uso:

5.1 Gauge calibration is performed for the following purposes:

5.1.1 When necessary, to compute the calibration constants of a density calibration equation that relates the gauge density system response (the “density count”) to the soil-equivalent density of the standard on which this response is elicited.

5.1.2 When necessary, to compute the calibration constants of a water content calibration equation that relates the gauge water content system response (the “water content count”) to the water mass per unit volume value of the standard on which this response is elicited.

5.1.3 To establish the relationship between the density measured by the gauge to the soil-equivalent density of the standard on which this response is elicited.

5.1.4 To establish the relationship between the water mass per unit volume measured by the gauge to the water mass per unit volume of the standard on which this response is elicited.

5.1.5 To ensure that the gauge has an in-place density gauge precision level that is consistent with typical gauge response.

5.1.6 To ensure that the gauge has an in-place water mass per unit volume gauge precision level that is consistent with typical gauge response.

5.2 Gauge verification is performed for the following purposes:

5.2.1 To indicate to the party or agency performing the verification when the mathematical relationship between the in-place density reading indicated by the gauge and the corresponding gauge density test count needs to be adjusted so that the gauge measurement errors do not exceed the specified absolute maximum measurement error for the calibration method used.

5.2.2 To indicate to the party or agency performing the verification when the mathematical relationship between the water mass per unit volume indicated by the gauge and the corresponding gauge water content test count needs to be adjusted so that the gauge measurement errors do not exceed the specified absolute maximum measurement error for the calibration method used.

5.2.3 Gauge verification and calibration require specialized training and equipment. Gauge calibration and verification are best conducted by those trained in the proper operation of the gauge, the calibration standards, and any tables, charts, graphs, or computer programs required for the proper execution of these operations.

Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluating some of those factors.

Subcomité:

D18.08

Referida por:

D2950_D2950M-22, D2950_D2950M-22, D8167_D8167M-23E01

Volúmen:

04.09

Número ICS:

17.040.30 (Measuring instruments)

Palabras clave:

calibration; calibration block; calibration constants; calibration equation; calibration standard; equation fit; gauge; in-place density; nuclear gauge; uncertainty; verification; water content; water mass per unit volume;