Laboratory manual for the evaluation of non-automatic weighing devices

LG-3.15 Temperature effect on the no-load indication

Table of contents


Reference

Section 24 of the Specifications Relating to Non Automatic Weighing Devices (1998)

Application

This test is performed on any complete electronic device, any electronic indicator or weighing element tested separately.

Settings

Procedure

  1. Stabilize the DUT at no load condition and at the start temperature for a period of time equal to the time that was required to apply an remove the load during the previous test.
  2. Zero the DUT, if the AZT is disabled; or place a small load ( ±5e) on the platter, and record the registration (Determine the error before rounding using small denomination weights).
  3. From 20°C to -10°C Lower the temperature of the environmental chamber down to -10°C at a rate not to exceed 1°C per minute.
  4. When the DUT has reached temperature stability, wait an additional 2 hours.
  5. If an enhanced resolution feature is being used then record the registration. Otherwise, using small denomination weights determine and record the registration prior to rounding. Record the results.
  6. From -10°C to 40°C Increase the temperature of the environmental chamber up to 40°C at a rate not to exceed 1°C per minute.
  7. When the DUT has reached temperature stability, wait an additional 2 hours.
  8. If an enhanced resolution feature is being used then record the registration. Otherwise, Using small denomination weights determine and record the registration prior to rounding. Record the results.
  9. From 40°C to 20°C Decrease the temperature of the environmental chamber to 20°C at a rate not to exceed 1°C per minute.
  10. When the DUT has reached temperature stability, wait an additional 2 hours.
  11. Using small denomination weights determine and record the registration prior to rounding. Record the results.

Interpretation of results

The device meets the requirements if the indication at zero or near zero does not vary by more than:

Revision

Rev. 1 (March 2010)
  • AZSM renamed to AZTM
  • IZSM requirements altered
  • Added requirement for testing between 40°C and 20°C
Date modified: