NZQA Expiring unit standard
2653 version 6
Page 1 of 3
Title
Demonstrate knowledge of strain gauges and weighing systems
Level
3
Credits
2
Purpose
People credited with this unit standard are able to demonstrate
knowledge of:
– strain gauge theory;
– weighing systems; and
– weighing system calibration methods.
Classification
Industrial Measurement and Control > Industrial Measurement
and Control - Theory
Available grade
Achieved
Entry information
Recommended skills
and knowledge
National Certificate in Electrical Engineering (Level 2) [Ref:
0174], or demonstrate equivalent skill and knowledge.
Explanatory notes
This unit standard has been developed for learning and assessment off-job.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of strain gauge theory.
Evidence requirements
1.1
Terms associated with strain gauge weighing systems are defined.
Range
1.2
Operations of strain gauge based on applied load are explained.
Range
1.3
stress, strain, Young’s modulus (of elasticity), gauge factor.
stress, strain, original resistance, gauge factor.
Calculations to find change in resistance of strain gauge are performed.
Range
The Skills Organisation
SSB Code 100401
stress, strain, original resistance, gauge factor.
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
1.4
Strain gauge types are described and compared.
Range
1.5
wire on paper backing, foil etched, semiconductor.
Mounting methods for strain gauges, bridge measuring circuits, and associated
methods of compensation of gauge resistance due to ambient temperature
change are described.
Range
1.6
2653 version 6
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single active gauge bridge, two active gauge bridge, single active
and dummy gauge bridge, four gauge bridge circuits.
Selection and mounting methods for strain gauges are described.
Range
active axis, passive axis, gauge material, coefficient of linear
expansion, adhesive bonding.
Outcome 2
Demonstrate knowledge of weighing systems.
Evidence requirements
2.1
Strain gauge load cells are described and compared.
Range
2.2
tensile, compressive, shackle, cantilever beam.
Strain gauge load cells in belt weighing systems are described.
Outcome 3
Demonstrate knowledge of weighing system calibration methods.
Evidence requirements
3.1
Typical methods used for calibrating weighing systems are described.
Range
description to include reference to – precision weights, alignment,
bridge measuring circuit calibration.
Replacement information
This unit standard and unit standard 2659 have been
replaced by unit standard 28082.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
2653 version 6
Page 3 of 3
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
31 October 1995
31 December 2013
Revision
2
30 October 1997
31 December 2013
Revision
3
3 April 2001
31 December 2013
Review
4
22 June 2001
31 December 2013
Review
5
19 May 2008
31 December 2017
Review
6
28 November 2013
31 December 2017
Consent and Moderation Requirements (CMR) reference
0003
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016