Laboratory manual for the evaluation of non-automatic weighing devices
LG-3.05 Suitability of the level indicator
Table of contents
Sections 9, 10, 11 and 22 of the Specifications Relating to Non Automatic Weighing Devices (1998)
This test is intended for complete portable or movable devices and weighing elements whose performance is affected when off level. Such devices must be equipped with a suitable level indicating means. This test is to ensure that the level indicating means is sensitive enough to accurately indicate the limit of inclination at which the device ceases to perform within tolerances.
- The AZT may be activated. It must be set so that the weight value that can be tracked at once does not exceed 0.6e.
- If the IZSM range of the device does not exceed 20% of Max, the test will be performed with the IZSM set at the maximum of the range.
- If the IZSM range exceeds 20% of Max, the test will be performed twice: the first test with the IZSM set to the lowest possible value; the second test with the IZSM set to the to the maximum of its range.
Note: In the case of a multi-range device, it is 20% of Max of the lowest range; in the case of a multi-interval device, it is 20% of max of the first range.
- The device must be leveled using the level indicating means, and adjusted to as close to zero error as possible.
- If the device has an "enhance" resolution feature, perform the test with that feature activated; or use the small weight method to determine errors before rounding.
- This test is performed at ambient temperature only.
- Incline the DUT in one direction (arbitrarily referred to as -x) up to the point of limit where the level indicating means still indicates a level condition or at least 2/1 000 (0.12 degree) whichever is greater.
- Set the device to zero if necessary; perform an increasing and decreasing load test. If necessary, use the small weight method to find errors before rounding. Record the results.
- Record the angle with reference to the horizontal
- Repeat the test described above for the other three inclinations (+x, -y, +y) (See the following illustrations).
Interpretation of results
The device meets the requirements if, at the limits of inclination in all four directions, it performs within applicable limits of error.
- Rev. 1 (March 2010)
- AZSM renamed to AZT
- Formatting change
- Date modified: