Laboratory manual for the evaluation of non-automatic weighing devices
LG-3.21 Portability test
Table of contents
- Interpretation of results
Sections 9, 10, 11, 12, 22 and 30 of the Specifications Relating to Non Automatic Weighing Devices (1998)
This test is intended for any device. For portable device this test must be performed at least once, after moving the device to the temperature chamber or to the permanence testing area, and should be performed whenever the device is moved during performance testing. For devices intended for permanent installation this test must be performed whenever the device is moved during performance testing.
- AZT may be in operation during the tests. It must be set to the lowest value; if zero is the lowest selectable value, it will be set to zero. The amount that the AZT may track at once may not be set to a value larger than 0.6e which is the maximum value allowed by the Specifications.
- The weighing device must be leveled to its reference position, and pre-loaded to the maximum capacity at least once.
- The device must be set for the maximum capacity and smallest verification scale interval for which the approval is sought.
- If so equipped, the "enhance resolution feature" of the device will be used during the test. If this feature is not available, use the small weight method to determine the device errors before rounding.
- This test is performed at ambient temperature (≈20°C); or at the mid point of the temperature range if significantly different from 20°C.
- After having moved the device, perform an increasing and decreasing test.
Interpretation of results
For portable devices:
The device meets the requirements if all the results remain within the applicable limits of error. If the error curve of the device has been significantly altered, but still within tolerance, then the device may be re-calibrated.
For permanent devices:
If the error curve of the device has been significantly altered then the device may be re-calibrated, even if the results are not within the applicable limits of error.
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