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20721 Demonstrate and apply knowledge of advanced diagnostics for

By Michael Coleman,2014-06-09 21:45
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20721 Demonstrate and apply knowledge of advanced diagnostics for

NZQA Expiring unit standard 20721 version 2

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    Title Demonstrate and apply knowledge of advanced diagnostics for

    electronics technicians

    Level 4 Credits 5

    Purpose This unit standard covers advanced diagnostics for electronics

    technicians.

    Included is the knowledge of:

    ; electronic component and product reliability;

    ; diagnostic processes;

    ; and the use of practical diagnostic techniques.

    Classification Electronic Engineering > Electronic Installation and

    Maintenance

Available grade Achieved

Explanatory notes

    1 This unit standard has been developed for off-job training and assessment.

2 The use of at least a signal generator, multimeter, and oscilloscope is expected in

    demonstrating competence for outcome 3.

3 Definitions 9 FIT failure unit = 1 failure/10 hours;

     R component reliability.

4 Range

     Electrical, radiation, and workshop or laboratory safety practices are to be observed

    at all times. This is an essential requirement.

ElectroTechnology Industry Training Organisation New Zealand Qualifications Authority 2012

    SSB Code 100401

NZQA Expiring unit standard 20721 version 2

     Page 2 of 4

Outcomes and evidence requirements

Outcome 1

    Demonstrate knowledge of electronic component and product reliability.

Evidence requirements

1.1 Sources that adversely affect reliability are described.

    Range typical sources intermittent connections, humidity, temperature,

    dust and dirt, radiation, electronic component failure, mechanical

    component failure, vibration, shock, corrosion, electrostatic

    discharge;

    evidence of at least five significant sources is required.

    1.2 The ‘bathtub curve’ is sketched with typical time values, and its different phases

    are described.

    Range phases burn-in, useful life, wear-out.

    1.3 The standard reliability curve is sketched, its formula stated, and its significance

    in relation to electronic component reliability is explained.

    1.4 Component reliability (R) is calculated for a given time period (t) and constant

    Hazard Rate (λ) or Mean Time To Failure (m).

     -λt-t/m Range R(t) = e = e;

    failure rates may be expressed as failures/hour, or FIT; 91 FIT = 1 failure/10 hours.

    1.5 The reliabilities of two systems in series and in parallel are calculated, given the

    reliabilities of the individual systems.

    1.6 Steps to improve component, system, and product reliability are outlined.

    Range three of component reliability de-rating; reduce temperature;

    reduce vibration, shock, humidity, corrosion; specify component

    reliability; use burnt-in components;

    three of system reliability reduce system complexity, increase

    component reliability, use parallel redundancy (hot spares), use

    standby redundancy (cold spares), repair maintenance,

    preventative maintenance;

    three of product reliability cleanliness and antistatic precautions

    during manufacture, burning in, temperature and/or humidity

    cycling, vibration testing.

ElectroTechnology Industry Training Organisation New Zealand Qualifications Authority 2012

    SSB Code 100401

NZQA Expiring unit standard 20721 version 2

     Page 3 of 4

Outcome 2

Describe diagnostic processes.

Evidence requirements

    2.1 Processes commonly used to diagnose faults in electronic equipment are

    outlined.

    Range confirm symptoms, look for the obvious, use previous fault data,

    use manufacturer’s diagrams and servicing information, run built-in

    diagnostics or programmes, use diagnostic measurement

    techniques to isolate faulty components, substitute with good

    component or module.

Outcome 3

Demonstrate systematic use of diagnostic techniques.

    Range take measurements and compare to servicing data; compare measured with

    calculated values; half-split method; compare with good product; substitution

    with good component or module; reproducing intermittent faults by application

    of mechanical stress, blowing, heat, cooling.

Evidence requirements

    3.1 Systematic use of techniques is demonstrated by locating faults in electronic

    equipment.

    3.2 The purpose of all actions and measurements is explained.

Replacement information This unit standard and unit standard 20718 have been

    replaced by unit standard 26725.

    This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below.

    Status information and last date for assessment for superseded versions Process Version Date Last Date for Assessment

    Registration 1 26 July 2004 31 December 2013

    Review 2 21 July 2011 31 December 2013

Consent and Moderation Requirements (CMR) reference 0003

    This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.

ElectroTechnology Industry Training Organisation New Zealand Qualifications Authority 2012

    SSB Code 100401

NZQA Expiring unit standard 20721 version 2

     Page 4 of 4

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.

ElectroTechnology Industry Training Organisation New Zealand Qualifications Authority 2012

    SSB Code 100401

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