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Field Inspection Manual — Non-Automatic Weighing Devices

Part 2, Section 5: IPO-5: Platform Scales


Electronic or mechanical bench, platform, floor or dormant scales


Inspector's weight kit, local standards of sufficient number and capacity, and material for strain or substitution test (if necessary).


Device is approved for trade use (NoA, Act Section 8)

Device is suitable for the actual use (STP-1)

Device has been initially inspected (if applicable) and bears the initial verification marks (R.29)

Device is sealed (NoA, STP-4)

Visual Examination — Installation and Location (STP-7)

Device is installed in accordance with restrictions and conditions listed in the notice of approval and in accordance with manufacturer's instructions

Device is adequately supported

Device indicating and load receiving elements are positioned for customer's view (if applicable)

Load receiving element can be observed from indicator's reading position

Clearance around load receptor

Device is properly levelled

Device is adequately protected

Visual Examination — Marking (STP-3)

Device is marked with the required information

Marking is located as required

Marking is permanent (if applicable)

Marking plate is permanently attached to the device

Visual Examination — Indicating element (STP-5)


Display Test (Segment)

Indicated and recorded values are adequately defined

Defining words and symbols for annunciators (Tare Entered, Gross and Net

Weight, Center-of-Zero) are readable


Scale marks, pointers and poise are in good condition

Defining words and symbols are readable

Zero setting material is enclosed and secured

Balancing ball is in good condition and secured in place

Poise adjusting material is enclosed and held firmly in position

Visual Examination — Recording Element (Printer) (STP-6)

Device prints the required values

Printed values are adequately defined

Device Configuration (Electronic)

Device configured as prescribed by the NOA (STP-2)

Zero Setting Mechanism Range ( 4% of Max or more) (STP-8)

Initial Zero Setting Mechanism Range (20% of Max or more) Footnote 1

AZTM Maximum Range (0.6 e)

Manual Entries of Gross Weights (STP-9) Footnote 1

Sleep Mode Test (STP-10) Footnote 1

Tare (Platter, Keyboard, and Pre-programmed Tare Entry) (STP-11)

Free Floating Weight Signal (STP-12)


Load Discrimination Test (Near Zero) (STP-14)

Increasing Test (STP-13)

Eccentricity Test (STP-15)

Load Discrimination (Max) (STP-14)

Agreement of Registration (STP-17)

Display Blanking Tests (Zero, Tare) (STP-18)

Decreasing and Return-to-Zero Test (STP-13)

Repeatability Test (STP-16)

Motion Detection Test (STP-19)

Accuracy of Price Computation (STP-20)

Mathematical Concordance of Tare, Net and Gross Weight (STP-21)

Off-Level Test (if applicable) (STP-22) Footnote 1

Disturbance Test (Electromagnetic Interference and Radio Frequency Interference, Vibrations). (STP-23)

Multi-deck Weighing Systems (STP-26)

Beam Scales

Calibration of Counterpoise & Other Trade Weights (STP-29)


Rev. 1

  • add STP-29 reference for Trade Weights.
  • remove trade weight examination & calibration procedures from IPO


Footnote 1

Tests performed at the initial inspection only.

Return to first footnote 1 referrer

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