Lectur Lecture 4: e 4: Electr Electrical Test Equipm ical Test - - PowerPoint PPT Presentation

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Feb 07, 2024 441 likes •566 views

Lectur Lecture 4: e 4: Electr Electrical Test Equipm ical Test Equipment ent Recall Fr Recall From om Lectur Lecture 3 e 3 Electrical Power: P I E Recall Fr Recall From om Lectur Lecture 3 cont'd e 3 cont'd Electrical Power:

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Lectur Lecture 4: e 4: Electr Electrical Test Equipm ical Test Equipment ent

SLIDE 2

Recall Fr Recall From

m Lectur

Lecture 3 e 3

Electrical Power:

I P E

SLIDE 3

Recall Fr Recall From

m Lectur

Lecture 3 cont'd e 3 cont'd

Electrical Power: PIRE wheel

All you REALLY need to remember: – – – algebra

E=I R P=I E

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Recall Fr Recall From

m Lectur

Lecture 3 cont'd e 3 cont'd

Relationship with Power

– If Power not constant with time – If Power constant

System Efficiency:

Energy=∫ PT dT Energy=PT

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Recall Fr Recall From

m Lectur

Lecture 3 cont'd e 3 cont'd

Mechanical Power:

Equation considering SI units:
Equation given in book:

P=

Angular speed (radians/s) Torque (N-m) Power (W)

SLIDE 6

Im Impor portant! tant!

SI Units vs. US Customary Units:

Be able to convert between units of measure.

– For tests: Do not need to know conversion factors – For future work: Be familiar with conversion factors.

E.g. 1 hp ~= 750 Watts
Know the SI-based equations:

– These are more fundamental – For tests: Need to know these equations.

E.g.

– For future work: Understand these equations.

P=

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Electr Electrical Test Equipm ical Test Equipment ent

Example test equipment

– Digital Multimeters (DMMs) – Voltage Testers

Reduced operation from DMM

– Current Testers

Clamp-on Ammeters

– Megohmmeter

Measure large resistances (e.g. insulation)

– Power Analyzer

Measure real and reactive power

– Oscilloscope

Mostly test-bench
Most informative

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Digital M Digital Multim ultimeter eter

Generally can measure

– AC and DC voltage – AC and DC current – Resistance – Connectivity

Important for Correct Usage:

– Multiple terminals

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Voltage Tester Voltage Testers

Contact

– Reduced Operation from DMM – Generally measure AC and DC voltages – Ballpark measurements!

Non-contact – Find live circuits – Generally for safety

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Am Ammeter eters

Contact Meters

– Like the function on the DMM – Not as useful in the field

Non-contact Meters (Clamp-On)

– No need to break circuit – Senses current by induction – Measures TOTAL current

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Megohm egohmmeter eter

Measures very large resistances

– Into the range – Requires large voltage source 500 to 1000 V – Useful for testing insulations

G

SLIDE 12

Oscilloscope Oscilloscope

Allows “view” of electrical signals
Gives most information
See demonstration