Laboratory manual for the evaluation of non-automatic weighing devices

LG-3.06 Warm up time

Table of contents


Sections 9, 10, 11, 31 and 32 of the Specifications Relating to Non Automatic Weighing Devices (1998)


This test is intended for any electronic devices and electronic major components.  The purpose of this test is to ensure that weight indications provided by a device while it warms up are accurate.



  1. Turn off and disconnect from the power source the DUT for a period of at least eight (8) hours (i.e. disconnect a wall mount transformer or pull the plug of AC device; remove the batteries of a DC device).
  2. Re-connect the DUT to the power source and switch it "on".
  3. Record the first available indication (i.e. the first indication that can be used for the purpose of the transaction).
  4. Set the device to zero.
  5. Apply a load equal to at least 70% of Max and record the indication.

Interpretation of results

The device meets the requirements if the first weight indications available are within the applicable limits of error. Otherwise, weighing operations (printing or indicating weight values) must be inhibited during the warming up period.

Note: OIML Recommendation R76 (A.5.2) - re-read the device at 5 minutes, 15 minutes and 30 minutes after power on. Each reading, when corrected for zero error at the time, must be within the applicable LOE.


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