Laboratory manual for the evaluation of non-automatic weighing devices

Part 3, Appendix C: Class IIIHD in-service limits of error

The following tables list the required accuracy standard for an inspection of a given device Non Automatic Device class. Individual tables are provided for Acceptance and In-Service as well as for Metric and Avoirdupois units of measure.

Required accuracy class of the standard—Acceptance
Metric Device type
(NAWD)
E1 E2 F1 F2 M1 M1-2 M2 M2-3 M3
I (when e ≥ 1 mg) All n ≤ 312 500 - - - - - - -
II (when e ≥ 1 mg) All All All All Footnote 1 - - - - -
III (e ≥ 0.1 g) All All All All All n ≤ 8 333 and
e ≥ 20 g
n ≤ 1 667 - -
III HD (e ≥ 2 kg) All All All All All n ≤ 36 666 n ≤ 18 333 - -
IIII (e ≥ 5 g) All All All All All e ≥ 200 g All e ≥ 500 g All
Required accuracy class of the standard—In Service
Metric Device type
(NAWD)
E1 E2 F1 F2 M1 M1-2 M2 M2-3 M3
I (when e ≥ 1 mg) All n ≤ 625 000 n ≤ 133 000 - - - - - -
II (when e ≥ 1 mg) All All All All Footnote 1 n ≤ 13 333 and
e ≥ 10 mg
- - - -
III (e ≥ 0.1 g) All All All All All e ≥ 20 g n ≤ 8 333 n ≤ 1 667 and
e ≥ 50 g
n ≤ 1 333
III HD (e ≥ 2 kg) All All All All All All n ≤ 36 667 n ≤ 18 333 n ≤ 2 000
IIII (e ≥ 5 g) All All All All All e ≥ 200 g All e ≥ 500 g All
Required accuracy class of the standard—Acceptance
Avoirdupois Device type
(NAWD)
E1 E2 F1 F2 M1 M1-2 M2 M2-3 M3
I NA n ≤ 312 500 - - - - - - -
II NA All All All Footnote 1 - - - - -
III (e ≥ 0.0002 lb or
0.005 oz)
NA All All All All n ≤ 8 333 and
e ≥ 0.05 lb
n ≤ 1 667 - -
III HD (e ≥ 5 lb) NA All All All All n ≤ 36 666 n ≤ 18 333 - -
IIII (e ≥ 0.01 lb or 0.2 oz) NA All All All All e ≥ 0.5 lb All e ≥ 1 lb All
Required accuracy class of the standard—In Service
Avoirdupois Device type
(NAWD)
E1 E2 F1 F2 M1 M1-2 M2 M2-3 M3
I NA n ≤ 625 000 n ≤ 133 000 - - - - - -
II NA All All All Footnote 1 n ≤ 13 333 and
e ≥ 0.2 gr ≥0.0005 oz tr
- - - -
III (e ≥ 0.0002 lb or 0.005 oz) NA All All All All e ≥ 0.05 lb n ≤ 8 333 n ≤ 1 667 and
e ≥ 0.1 lb
n ≤ 1 333
III HD (e ≥ 5 lb) NA All All All All All n ≤ 36 667 n ≤ 18 333 n ≤ 2 000
IIII (e ≥ 0.01lb or 0.2 oz) NA All All All All e ≥ 0.5 lb All e ≥ 1 lb All

Notes:

Revision

Rev.1: Suspend restriction on Class II devices inspected with Precious Metal Weight Kits (OIML Class F2 weights)

Footnotes

Footnote 1

This section is under review. Until further notice, Precious Metal Weights (OIML F2) are suitable for inspection of all Class II devices.

Return to footnote 1 referrer

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