TS–012 Using indicators in expanded or test mode on weighing instruments

This policy prescribes the procedure to be followed when using an indicator in expanded or test mode and the subsequent sealing or verification of the indicator.

Reference documents


An indicator must comply with the following criteria when it is switched into expanded or test mode for the purposes of performing a verification or inspection test.

The accuracy of the expanded mode is to be proven in the following manner:

  1. Working Standards of a load ≥ the minimum capacity are placed on the load receptor
  2. Ten loads of 1/10th of ‘e’ are sequentially applied to the load receptor and compared to the indicated readings
  3. The indicated values must equal the value of the applied loads with no error
  4. Record on the test sheet that expanded mode has been proven and record the value of the event counter on the test sheet post calibration
  • If the indicated load does not equal the applied load, the expanded or test mode cannot be used to verify or certify the instrument.
  • If the instrument is switched into expanded mode then verification MPE will apply to all tests
  • This policy must be read in conjunction with Trading Standards Technical Policy TS–006.

Technical Policy TS–006 When is a full verification test required for weighing and measuring instruments

Where required by the Certificate of Approval, the event counter number must be recorded on the Mark of Verification (MOV), or on a dedicated adhesive destructible label designated “Event Counter” attached next to the MoV on the Indicator

Where the event counter number on the instrument does not equal the event counter number detailed on the MOV, the instrument may be deemed to be unstamped and not to be used for trade.

Trade Measurement — Technical Policy

Policy number: TS - 012
Effective date: July 2016
Version date: October 2016
Version number: 2
Policy name: Using indicators in expanded or test mode on weighing instruments
Reviewed by: Davis White, Legal Metrology Advisor and Senior Trading Standards Officer
Approved by: Phil Sorrell, Team Leader Compliance and Inspection