Laboratory manual for the evaluation of non-automatic weighing devices

LG-3.08 AC Voltage variation

Table of contents


Sections 9, 10, 11 and 27 of the Specifications Relating to Non Automatic Weighing Devices (1998)


This test is performed on any complete electronic devices or major electronic components powered from an AC source. Self-powered weighing elements will be submitted to this test. Voltage variations are susceptible to occur during the normal use of devices. The purpose of this test is to ensure that voltage variations do not affect the device performance.



  1. Let the Power Supply and the DUT warm up for the minimum time recommended by the manufacturer.
  2. Decrease the voltage to the minimum voltage specified.
  3. Perform an increasing and decreasing test and record the results.
  4. Activate the device functions to ensure they operate normally (tare, print, motion detection, etc.)
  5. Record the following data:
    1. time,
    2. temperature,
    3. relative humidity,
    4. voltage,
    5. loads,
    6. indications,
    7. errors, and
    8. note any malfunctions of the features.
  6. Increase the power supply voltage to the maximum voltage specified; repeat steps 3, 4 and 5.

Maximum and minimum voltage specified

Interpretation of results

The DUT is deemed to have met the requirements if, during the voltage variations, the device:


Rev. 1 (March 2010)
  • AZSM renamed to AZT
  • Formatting change
  • Procedure altered to change specified voltages with devices that operate over a range of voltages
  • Removed requirement for an increasing/decreasing test at nominal voltage
Date modified: