HKIE Professional Assessment - Electronics Discipline key terms

A statutory certification route under Hong Kong's Buildings Ordinance regime where a registered structural engineer confirms structural adequacy of works; electronics practitioners rarely hold this role but must coordinate with it when installing equipment affecting building structure.

A Hong Kong Buildings Department framework allowing specified small-scale building works to proceed under simplified procedures using prescribed plans and qualified persons, rather than full plan submission and approval.

A contractor registered with Hong Kong's Electrical and Mechanical Services Department to carry out electrical installation work; fixed electrical installations in buildings must generally be undertaken or supervised within this registration framework.

The permanently installed wiring, switchgear, distribution boards and accessories supplying premises, as distinct from plug-in appliances; in Hong Kong it is subject to periodic inspection, testing and certification requirements.

A recurring statutory safety regime for fixed electrical installations in Hong Kong, requiring inspection and testing by competent persons at intervals set by installation type, followed by issue of a certificate of testing.

A formal declaration issued after electrical or lift and escalator works are finished, confirming the installation meets applicable safety requirements before it is energised or handed over for use.

Demonstrating that equipment both limits emitted electromagnetic disturbance and tolerates disturbance in its environment, typically through standards-based testing, technical documentation and a declaration of conformity before placing on the market.

A Hong Kong regulatory process under which radio transmitting apparatus must be approved or certified against prescribed technical standards before it may be offered for sale or use on designated frequencies.

A manufacturer's signed statement that a product meets specified standards and directives, supported by test evidence and technical files; it shifts primary verification responsibility onto the supplier rather than a pre-market regulator.

The retained compilation of design information, test reports, risk assessments and labelling evidence that substantiates a product's compliance claims and must be producible to an enforcement authority on request.

The Hong Kong safety obligations placed on contractors and site personnel to provide safe systems of work, protective equipment and supervision, breach of which can attract criminal liability independent of civil negligence claims.

A structured process of identifying hazards in a task or workplace, estimating likelihood and severity of harm, and recording controls; in Hong Kong it underpins statutory safety management and is expected before high-risk work begins.

The ordered preference for risk controls: eliminate the hazard, substitute, apply engineering controls, then administrative measures, with personal protective equipment as the last line of defence.

The selection, issue, training, inspection and replacement regime for protective items such as helmets, eye protection and insulated gloves; it is a residual control and does not remove the underlying hazard.

An energy-isolation procedure in which sources are switched off, isolated, locked and tagged by the person working on the equipment, preventing unexpected energisation during maintenance or installation.

A formal authorisation process for high-risk activities, recording the scope, isolations, precautions and sign-offs required before work starts and confirming safe restoration before the permit is closed.

The staged process of verifying that installed systems function as designed, covering pre-functional checks, energisation, functional performance testing, tuning and documented handover to the client.

A register of outstanding defects or incomplete items identified during inspection and commissioning, each tracked with an owner and close-out date before final acceptance and release of retention.

A percentage withheld from interim payments as security for performance and defect rectification, released in stages, commonly half on completion and half after the defects liability period expires.

A defined period after completion during which the contractor must remedy defects notified by the employer at its own cost, after which the remaining retention and final account are settled.

A periodic valuation and certification of work done, issued by the contract administrator, which fixes the amount and timing of progress payments and triggers payment obligations under the contract.

A written instruction changing the scope, quantity, quality or timing of contracted work; without proper authority and documentation it may not be recoverable as additional payment.

A contractor's request to extend the completion date for delay caused by an excusable event, supported by records and programme analysis, which protects against liquidated damages for that period.

A pre-agreed sum payable per period of culpable delay, representing a genuine forecast of the employer's loss; it must not be a penalty or it becomes unenforceable.

A written disclosure of any financial or personal interest that could influence professional judgement, made promptly to the client or employer so that the situation can be managed or the member withdrawn.

The obligation to act in the client's legitimate interests, avoid undisclosed gain, keep information confidential and give impartial technical advice even where it conflicts with the engineer's commercial convenience.

Two distinct standards of professional obligation: an absolute promise that the result will suit a stated purpose, versus a duty to exercise the competence expected of a reasonably competent practitioner in comparable circumstances.

Reporting suspected wrongdoing, unsafe practice or regulatory breach to an appropriate internal or external authority, which professional codes protect when done in good faith and through proper channels.

Documented evidence that a design was checked at defined stages by competent persons independent of the originator, covering calculations, interfaces, assumptions and resolution of comments.

Verification confirms a design meets its specified requirements; validation confirms the resulting system meets the user's actual need in the intended operating environment. Both need planned evidence, not opinion.

The preservation of waveform quality along an interconnect, degraded by reflections, crosstalk, attenuation and ground bounce; controlled impedance, termination and return-path continuity are the usual countermeasures.

A printed circuit board layer arrangement in which trace width, dielectric thickness and spacing are chosen so that transmission lines present a target characteristic impedance, agreed with the fabricator and verified by test coupons.

An overlay of many signal transitions on a common time base, whose opening indicates margin against timing jitter and amplitude noise; mask tests define pass or fail limits.

The proportion of received bits that are wrong over a defined interval; it links link-budget, noise and equalisation performance to a measurable acceptance criterion, often quoted at a specified confidence.

An accounting of gains and losses from transmitter through channel to receiver, showing the margin above the minimum required received level, including antenna gain, path loss and implementation losses.

The extra received signal strength designed in above the minimum threshold, providing headroom against fading, ageing and interference so that availability targets are met over the system's life.

Sampling a band-limited signal at more than twice its highest frequency preserves information; sampling slower folds high frequencies onto low ones as aliasing, which anti-alias filtering must prevent before conversion.

The error introduced when a continuous amplitude is rounded to discrete levels; for an ideal converter it approximates uniform noise, giving roughly six decibels of signal-to-noise improvement per added bit.

A measured figure of converter performance derived from signal-to-noise-and-distortion ratio, capturing real impairments such as clock jitter and nonlinearity that ideal bit-count specifications hide.

A digital filter whose output depends only on present and past inputs, giving guaranteed stability and exactly linear phase when coefficients are symmetric, at the cost of more computation.

A hardware counter that resets the processor unless periodically serviced by software, recovering embedded systems from hangs; it must be serviced from a proven-alive code path, not an interrupt blindly.

The expected operating time between successive failures of a repairable system, computed from component failure rates; it describes reliability, not the lifetime of an individual unit.

The fraction of time a system is operable, combining reliability and maintainability; it is often expressed as uptime over total time and improved by redundancy or faster repair.

A systematic tabulation of how each part or function can fail, its local and system effects, and its severity, occurrence and detection ratings, used to prioritise design and test effort.