Laboratory manual for the evaluation of non-automatic weighing devices

LG-3.05 Suitability of the level indicator

Table of contents


Reference

Sections 9, 10, 11 and 22 of the Specifications Relating to Non Automatic Weighing Devices (1998)

Application

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.

Settings

Procedure

  1. 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.
  2. 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.
  3. Record the angle with reference to the horizontal
  4. Repeat the test described above for the other three inclinations (+x, -y, +y) (See the following illustrations).

Figure 1: Level bubble indications

The graphic shows four level bubbles with four different tilt indications on both the X and Y axes. These inclinations represent left, right, back, fore tilt of the device and are arbitrairly referred to as + and - X and + and - Y.
Full description—Figure 1: Level Bubble Indications

The graphic shows four level bubbles with four different tilt indications on both the X and Y axes. These inclinations represent right, left, fore and back tilt of the device and are arbitrairly referred to as -X and +X and +Y and -Y.

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.

Revision

Rev. 1 (March 2010)
  • AZSM renamed to AZT
  • Formatting change
Date modified: