The calibration procedure for non-destructive vacuum testing instruments usually includes the following main steps:
Instrument inspection:
Check if the appearance of the vacuum tester is complete and if the instrument display is clear.
Check for damage or aging of vacuum tubes, connecting pipelines, seals, etc.
Check if the vacuum pump, sensors, electronic components, etc. are working properly.
Verification standard:
A standard vacuum gauge with high accuracy, such as a ceramic pressure sensor or high-precision vacuum gauge, should be selected as the comparison standard.
The calibration standard vacuum gauge needs to be calibrated and ensured to have good performance.
Gas source requirements:
The gas supply should be a clean, water free, and oil-free source to ensure that the vacuum test is not affected by external pollution.
Test the stability of the gas source to ensure that its stable output airflow does not affect the accuracy of the instrument.
Vacuum degree test:
Connect a standard vacuum gauge to a testing instrument to conduct multiple tests at different vacuum levels and record the test results.
Using different ranges of vacuum degree, the reading of the tester should be compared with the reading of the standard vacuum gauge to ensure that the error is within the allowable range.
Error assessment:
Calculate the error between the testing instrument and the standard vacuum gauge based on the comparison results.
Assess whether the error meets the requirements according to relevant national or industry standards. Normally, those with errors within the specified range are considered qualified.
Adjustment and correction:
If errors are found to exceed the specified range, adjustments and corrections need to be made.
If there are hardware malfunctions or uncorrectable deviations, it may be necessary to replace or repair the equipment.
Regular verification:
Regularly calibrate the non-destructive vacuum tester to ensure its long-term accuracy.
The verification period is determined based on factors such as frequency of use and environmental conditions.
The above are general verification regulations, and specific operations should also refer to relevant national standards and industry norms.