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Transcript
NZQA Expiring unit standard 5464 version 5 Page 1 of 8 Title Explain automotive electrical and electronic applications Level 3 Credits 12 Purpose This theory based unit standard is for people in the automotive repair industry. People credited with this unit standard are able to demonstrate knowledge of the following used in automotive circuits: inductance; capacitors and chokes; resistors; AC (alternating current); semi-conductors; transistors; amplifier application; silicon controlled rectifiers (SCR's) and thyristors; digital fundamentals; display devices; multiplex wiring; microprocessors. People are also able to create series-parallel circuits using resistors, calculate voltage and current distribution, and calculate values of power, given any two of voltage, current, or resistance values. Classification Motor Industry > Automotive Electrical and Electronics Available grade Achieved Entry information Unit 232, Test an automotive electrical circuit, or demonstrate equivalent knowledge and skills. Critical health and safety prerequisites Explanatory notes None. Outcomes and evidence requirements Outcome 1 Demonstrate knowledge of inductance for automotive applications. Evidence requirements 1.1 Types of magnetic fields are described by showing the lines of flux. Range 1.2 around a coil, around a magnet, around a conductor. The principle of inductance is described according to Lenz's Law. Range self inductance, mutual inductance. NZ Motor Industry Training Organisation (Incorporated) SSB Code 101542 New Zealand Qualifications Authority 2017 NZQA Expiring unit standard 1.3 Magnetic properties of materials are identified. Range 1.4 5464 version 5 Page 2 of 8 air, ferrite. Magnetic curves are expressed in diagram form. Range hysteresis of hard and soft iron. Outcome 2 Demonstrate knowledge of capacitors and chokes for automotive applications. Evidence requirements 2.1 Factors that affect capacitance are explained in terms of plate area, distance apart, and dielectric material. 2.2 Types of capacitors are identified and their applications defined. Range oil, electrolytic, plastic. 2.3 Capacitor operation is described by plotting charge and discharge of voltage and current. 2.4 Types of chokes and their application are described according to manufacturer’s specifications. Range iron (ferrite) cored, air cored. Outcome 3 Demonstrate knowledge of resistors used in automotive electronic applications. Range light dependent resistor (LDR), voltage dependent resistor (VDR), temperature dependent resistor (TDR). Evidence requirements 3.1 Types of resistors used for automotive electronic circuits are identified from manufacturer's manuals and catalogues. 3.2 Operational characteristics of each of the range of resistors are explained according to manufacturer’s specifications. 3.3 The effects of temperature change on resistors are explained according to manufacturer’s specifications. Range positive temperature co-efficient (PTC), negative temperature coefficient (NTC). NZ Motor Industry Training Organisation (Incorporated) SSB Code 101542 New Zealand Qualifications Authority 2017 NZQA Expiring unit standard 5464 version 5 Page 3 of 8 Outcome 4 Demonstrate knowledge of AC (alternating current) used in automotive applications. Evidence requirements 4.1 Frequency of AC is calculated from a given signal on an oscilloscope. Range 4.2 AC values relating to automotive applications are derived by reference to an oscilloscope trace of a signal generator and transformer. Range 4.3 sine curve terms. peak values, average value, RMS (root mean square). Impedance in an AC circuit containing capacitance, inductance, and resistance is explained in terms of the effects on lead and lag of voltage and current. Outcome 5 Demonstrate knowledge of semi-conductors used in automotive applications. Evidence requirements 5.1 p-n junction characteristics are identified. Range 5.2 positive and negative charged electron transfer, forward bias, reverse bias. Diode operation is identified. Range rectifier diode, Zener diode, light emitting diode (LED), photo diode. 5.3 Rectification patterns are identified by sketching AC halfwave and fullwave forms. 5.4 Diode ratings for a given automotive application are stated. Range wattage, current, forward and reverse voltage. 5.5 Use of diodes in an automotive application is described in terms of a dual charging system, transient protection, and a Zener diode as a voltage stabiliser. 5.6 Replacement procedure for a diode in an automotive circuit is described according to diode manufacturer's specifications. Range rectifier diode, LED. NZ Motor Industry Training Organisation (Incorporated) SSB Code 101542 New Zealand Qualifications Authority 2017 NZQA Expiring unit standard 5464 version 5 Page 4 of 8 Outcome 6 Demonstrate knowledge of transistors used in automotive circuits. Evidence requirements 6.1 The symbols, operation, and terminal layout of transistors are described according to manufacturer’s specifications. Range 6.2 BJT (bipolar junction transistor), FET (field effect transistor). The use of a BJT as a switch in an automotive circuit is described according to manufacturer’s specifications. Range on and off, high and low resistance. 6.3 Common emitter amplifier function is described in terms of signal inversion and application. 6.4 Automotive transistor testing procedures are described according to manufacturer's specifications. Range 6.5 manufacturer's forward and reverse junction resistance specifications. Transistor bias is explained according to manufacturer’s specifications. Range forward and reverse junction. Outcome 7 Demonstrate knowledge of amplifier application for automotive circuits. Evidence requirements 7.1 Amplifier couplings for an automotive circuit are described in block form. Range direct AC, transformer. 7.2 Darlington amplifier function and operation are described in terms of current gain and application. 7.3 Amplifier operation in an automotive circuit is described according to manufacturer’s specifications. Range description in block form; amplifying analogue transducer signals. NZ Motor Industry Training Organisation (Incorporated) SSB Code 101542 New Zealand Qualifications Authority 2017 NZQA Expiring unit standard 5464 version 5 Page 5 of 8 Outcome 8 Demonstrate knowledge of silicon controlled rectifiers (SCR's) and thyristors in automotive circuits. Evidence requirements 8.1 SCR and thyristor operation in an automotive circuit is described according to manufacturer’s specifications. Range 8.2 symbol, action in a DC ignition circuit. SCR and thyristor ratings for automotive circuits are described according to manufacturer’s specifications. Range voltage and current handling. Outcome 9 Demonstrate knowledge of digital fundamentals for automotive circuits. Evidence requirements 9.1 The differences between analogue and digital electronics are compared. Range 9.2 chart differences in on-off characteristics. Logic gate operation is described according to manufacturer’s specifications. Range or, and, not, truth tables. Outcome 10 Demonstrate knowledge of display devices for automotive applications. Evidence requirements 10.1 Display device function and operation are described according to manufacturer’s specifications. Range 10.2 seven digit, liquid crystal, dot matrix. Repair requirements for display devices are identified. Range testing procedures, replacement of unit. NZ Motor Industry Training Organisation (Incorporated) SSB Code 101542 New Zealand Qualifications Authority 2017 NZQA Expiring unit standard 5464 version 5 Page 6 of 8 Outcome 11 Demonstrate knowledge of multiplex wiring for automotive circuits. Evidence requirements 11.1 The use of multiplexing for automotive circuits is identified. Range colour coding, digital buss. Outcome 12 Demonstrate knowledge of microprocessors used in automotive circuits. Evidence requirements 12.1 The operation of memory devices for automotive circuits are described according to manufacturer’s specifications. Range 12.2 Terminology associated with microprocessors is described according to manufacturer’s specifications. Range 12.3 description in block form; control module, arithmetic and logical unit, registers, accumulator, clock. The use of microprocessors for automotive systems is described according to manufacturer’s specifications. Range 12.5 RAM (random access memory), ROM (read only memory), ECM (Electronic Control Module), input/output, KAM (Keep Alive Memory). Parts of a microprocessor are described according to manufacturer’s specifications. Range 12.4 storing the programme, holding information data for inputs and outputs. as an Electronic Control Module (ECM), controlling a system, signal recognition. Sections of an ECM are described according to manufacturer’s specifications. Range description in block form; microprocessor, memory section, input-output section. NZ Motor Industry Training Organisation (Incorporated) SSB Code 101542 New Zealand Qualifications Authority 2017 NZQA Expiring unit standard 5464 version 5 Page 7 of 8 Outcome 13 Create series-parallel circuits using resistors, and calculate voltage and current distribution. Range physically assembled from components, drawing a diagram. Evidence requirements 13.1 Circuits are produced with three resistors and with four resistors. 13.2 The voltage across each resistor is calculated and measured. Range 13.3 using Ohm's Law, using test instruments. The current through each resistor is calculated and measured. Range using Ohm's Law, using test instruments. Outcome 14 Calculate values of power, given any two of voltage, current, or resistance values. Range series circuit, parallel circuit, series-parallel circuit. Evidence requirements 14.1 Formulas chosen are correct for the values given. 14.2 Answers are expressed using correct multiples and sub-multiples of the unit. Range mega, kilo, milli, micro. Replacement information This unit standard has been by replaced unit standard 24129, unit standard 24130, unit standard 24131, and unit standard 24132. This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below. NZ Motor Industry Training Organisation (Incorporated) SSB Code 101542 New Zealand Qualifications Authority 2017 NZQA Expiring unit standard 5464 version 5 Page 8 of 8 Status information and last date for assessment for superseded versions Process Version Date Last Date for Assessment Registration 1 31 October 1995 31 December 2016 Review 2 29 March 1999 31 December 2016 Review 3 25 January 2008 31 December 2016 Rollover 4 19 November 2010 31 December 2016 Rollover 5 18 February 2016 31 December 2020 Consent and Moderation Requirements (CMR) reference 0014 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, or an inter-institutional body with delegated authority for quality assurance, 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. Consent requirements and an outline of the moderation system that applies to this standard are outlined in the Conesnt 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. NZ Motor Industry Training Organisation (Incorporated) SSB Code 101542 New Zealand Qualifications Authority 2017