By the end of this chapter, you will be able to: - follow health and safety procedures correctly to keep yourself and others safe while working with electrical measurement instruments - accurately record electrical quantities according to job specifications - select electrical units that match the operating standards of the instruments you are using - apply measurement standards that comply with international bureau of weights and standards - choose the right measuring instruments based on their specific functions for each task - use electrical measuring instruments correctly according to job requirements - apply analogue to digital converters appropriately as specified in the job - accurately record measurements based on the instrument’s readings - clearly record performance characteristics as required by the job specifications
Mastering these skills will help you work safely, efficiently, and professionally in the electrical trade.
Electrical measurement instruments are fundamental tools for electrical engineers, enabling accurate assessment of electrical quantities essential for design, troubleshooting, and maintenance in Kenya's power and industrial sectors. Mastery of the basic electrical units and their practical implications ensures precision in diagnostics and effective communication across multidisciplinary teams. This chapter focuses on the core electrical units, providing a detailed understanding crucial for professional practice in electrical engineering.
Create a free account to open more of this chapter.
Free: practical guides, quick cards, workplace scenarios and more.
Create a free accountThis chapter explored the essential electrical properties of capacitance and inductance, explaining their measurement and significance in electrical circuits. It then detailed fundamental electrical units such as amperes, volts, watts, ohms, farads, and henrys, clarifying their roles in quantifying electrical phenomena. The discussion on measurement standards covered international, primary, secondary, and working standards, emphasizing their importance in ensuring accuracy and consistency. Various electrical measuring instruments including voltmeters, ammeters, ohmmeters, and multimeters were examined with respect to their functions and applications. The chapter also addressed converters, focusing on analogue to digital and digital to analogue conversion processes that facilitate signal interpretation. Measurement presentation mechanisms such as display and recording methods were reviewed to highlight how data is effectively communicated. Finally, the performance characteristics of instruments were analyzed, distinguishing between static factors like precision and repeatability, and dynamic factors such as fidelity and measuring lag, to underscore the reliability of electrical measurements.
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Capacitance Meter | Capacitor 10µF, 50V |
| Insulated Pliers | Personal Protective Equipment (Gloves, Goggles, Dustcoat) |
| Connecting Test Leads | Cleaning Cloth |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Capacitance Meter | 1 Pc per Candidate |
| 2 | Capacitor 10µF, 50V | 1 Pc per Candidate |
| 3 | Connecting Test Leads for Capacitance Meter | 1 Set per Candidate |
| 4 | Insulated Pliers | 1 Pc per Candidate |
| 5 | Personal Protective Equipment (Gloves, Goggles, Dustcoat) | 1 Set per Candidate |
| 6 | Clean Workbench or Table | 1 per Candidate |
| 7 | Cleaning Cloth | 1 Pc per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Safety and Preparation | |||
| Wore personal protective equipment (gloves, goggles, dustcoat) (Award 2 or 0) | 2 | ||
| Ensured clean working area before starting the measurement (Award 2 or 0) | 2 | ||
| Selected and inspected capacitance meter and test leads for good condition (Award 2 or 0) | 2 | ||
| Sub-Total | 6 | ||
| TASK 2: Measurement Procedure | |||
| Discharged capacitor safely before measurement (Award 3 or 0) | 3 | ||
| Connected capacitor terminals correctly to the capacitance meter using test leads (Award 3 or 0) | 3 | ||
| Set the capacitance meter to the correct range for 10µF measurement (Award 2 or 0) | 2 | ||
| Took stable and accurate reading from the capacitance meter (Award 4 or 0) | 4 | ||
| Recorded the capacitance value correctly in microfarads (µF) (Award 3 or 0) | 3 | ||
| Sub-Total | 15 | ||
| TASK 3: Post-Measurement | |||
| Switched off and safely stored the capacitance meter and test leads (Award 2 or 0) | 2 | ||
| Cleaned the working area and disposed or stored materials properly (Award 2 or 0) | 2 | ||
| Sub-Total | 4 | ||
| PRODUCT CHECKLIST | |||
| Capacitance measurement value recorded within ±10% of nominal 10µF (Award 5 or 0) | 5 | ||
| Measurement procedure followed correctly ensuring safety and accuracy (Award 5 or 0) | 5 | ||
| Sub-Total | 10 | ||
| GRAND TOTAL | 35 | ||
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Inductance Meter | Standard Test Coil (known inductance) |
| Multimeter (Digital) | Report Writing Paper A4 |
| Voltmeter 0-250 V AC | PPE: Gloves, Safety Goggles, Dustcoat |
| Ammeter 0-1 A Analog | |
| Ohmmeter | |
| Connecting Leads (Banana Plug to Banana Plug) | |
| Pen and Pencil |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Inductance Meter | 1 Pc per 3 Candidates |
| 2 | Standard Test Coil (known inductance) | 1 Pc per Candidate |
| 3 | Connecting Leads (Banana Plug to Banana Plug) | 2 Sets per Candidate |
| 4 | Multimeter (Digital) | 1 Pc per Candidate |
| 5 | Voltmeter 0-250 V AC | 1 Pc per 5 Candidates |
| 6 | Ammeter 0-1 A Analog | 1 Pc per 5 Candidates |
| 7 | Ohmmeter | 1 Pc per 5 Candidates |
| 8 | PPE: Gloves, Safety Goggles, Dustcoat | 1 Set per Candidate |
| 9 | Report Writing Paper A4 | 3 Sheets per Candidate |
| 10 | Pen and Pencil | 1 Set per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Measurement Procedure | |||
| Wore personal protective equipment (Gloves, Goggles, Dustcoat) (Award 2 or 0) | 2 | ||
| Ensured clean and safe working area before starting (Award 1 or 0) | 1 | ||
| Selected and used correct tools and instruments properly (Award 3 or 0) | 3 | ||
| Connected the coil correctly to the inductance meter using proper leads (Award 4 or 0) | 4 | ||
| Set the inductance meter to the correct range and mode (Award 3 or 0) | 3 | ||
| Recorded the inductance reading accurately from the meter (Award 3 or 0) | 3 | ||
| Used multimeter to cross-check coil resistance and continuity (Award 3 or 0) | 3 | ||
| Measured voltage and current if applicable for verification (Award 3 or 0) | 3 | ||
| Disassembled and stored instruments and coil safely after measurement (Award 1 or 0) | 1 | ||
| Sub-Total | 23 | ||
| TASK 2: Report Preparation | |||
| Prepared a clear report including coil identification details (Award 3 or 0) | 3 | ||
| Included measured inductance value expressed in Henrys (H) (Award 4 or 0) | 4 | ||
| Recorded instrument readings (voltage, current, resistance) clearly (Award 4 or 0) | 4 | ||
| Provided observations and comments on coil condition and measurement (Award 3 or 0) | 3 | ||
| Report is neat, legible, and well organized on A4 paper (Award 3 or 0) | 3 | ||
| Sub-Total | 17 | ||
| PRODUCT CHECKLIST | |||
| Report contains accurate inductance measurement matching meter reading within ±5% (Award 5 or 0) | 5 | ||
| Report includes all required instrument readings with correct units (Award 3 or 0) | 3 | ||
| Report is complete with coil identification and observations (Award 2 or 0) | 2 | ||
| Sub-Total | 10 | ||
| GRAND TOTAL | 50 | ||
At the start of this chapter we promised you would be able to:
Tick each one you can genuinely do.
So, are you there yet?
You're competent when you can confidently do 50% or more of what this chapter promised.
Sign in to record how you're doing.