The Influence and Solution of Environmental Errors in Weight Calibration

1、 The influence of temperature changes on the calibration of standard weights

The influence of temperature on weights in metrological verification is multifaceted. To ensure the accuracy of weight verification, temperature changes must be strictly controlled. To eliminate the influence of temperature changes on weight calibration, it is required that the weight room should be equipped with central air conditioning and the division value should not exceed0.1A thermometer with a temperature of ℃ should be calibrated according to the calibration cycle. The calibration of weights should be carried out under stable environmental conditions, with the weight temperature close to room temperature. ForE1andE2Grade weight, laboratory temperature should be within18℃~25℃, the environmental conditions should meet the corresponding requirements of the measuring instrument.

2、 The influence of humidity changes on the calibration of standard weights

For weights, they are themselves insulating materials. Once moisture is adsorbed, the electrical properties of the material will be changed. For example, the more moisture is adsorbed, the greater the decrease in insulation resistance of the material. At this time, leakage current will increase, capacitance will increase, and dielectric loss will increase, which seriously threatens the safety of operators.

In order to eliminate the adverse effects of humidity changes on weight calibration, it is necessary to configure the laboratory with a division value not lower than5%Dry hygrometer and calibrate it according to the calibration cycle. In the storage process of weights, the upper limit of humidity is crucial. If the humidity exceeds the requirements of the calibration regulations, measures such as increasing the airflow or dehumidifying should be taken, and the calibration can only be carried out after the environment meets the regulations.

The effects of temperature and humidity on experimental results often occur in combination. At the same humidity, the higher the temperature, the faster the insulation becomes damp40The rate of moisture absorption at ℃ is approximately20At ℃2~5Double, and55At ℃, it is approximately20At ℃15Twice. From this, it can be seen that temperature and humidity have a significant impact on calibration, and calibration work must be carried out according to standards.

3、 The influence of other environmental factors on weight calibration

Magnetism, vibration, air pressure, air buoyancy, and static electricity can all have a certain impact on the results of weight calibration. Therefore, laboratories have certain control requirements for these factors. For example, the laboratory should be equipped with a barometer that is compatible with the accuracy of the weights; The error caused by air buoyancy shall not exceed the accuracy of the weight1/5When calibrating weights, they should be kept away from the vibration source to prevent vibration from increasing the variability of the balance and avoiding errors in the calibration results; Use a de electrification agent to avoid the influence of electrostatic forces caused by static induction on the calibration results.

The Influence and Solution of Environmental Errors in Weight Calibration