Chapter 12

The International Electrotechnical Commission (IEC) developed a safety standard for overvoltage installation categories of CAT I, CAT, II, CAT III, and CAT IV for _______.

Test equipment

A voltmeter is used to test _______.

Voltage ranges

The measurement of t he electromotive force of a circuit is accomplished using a(n) _______.

Voltmeter

In order to ensure safety, before measuring low voltages, you should first test for _______.

higher voltages

An insulation tester is another name for a(n) _______.

megohmmeter

Digital meters do not have a(n)

meter movement

The voltage range of a meter movement can be extended by adding a(n) _______ _______ in series.

shunt resistor

A motor rotation tester _______.

work on residual magnetism

The highest level of protection is provided by instruments rated as _______.

CAT IV

Used for electromagnetic effects or for providing electrical resistance, a _______ is a number of turns of wire

Coil

__________ is an uninterrupted electrical path for current flow.

Continuity

An ammeter is used to measure _______.

Current

A _____________________ uses a permanent magnet and moving coil arragement to move a pointer across a scale.

D'Arsonval Meter

De-energizing the main supply circuit will always de-energize all circuits in a given piece of equipment. (T or F)

False

True or False? Always connect an ohmmeter in parallel with a load.

False (should be connected in series)

True or False? A voltage tester is used for precise voltage measurements.

False (voltage range)

When using a voltmeter that is not auto ranging, start with the highest setting and work down until the meter reads somewhere between _______ and _______.

1/2 and 3/4 scale

Usually expressed in hertz, ____________ is the number of cycles of completed each second by a given AC voltage.

Frequency

What type of test equipment would you use to check the resistance between motor windings?

Megohmmeter

Short circuits can be detected by using a(n) _______.

Ohmmeter

The phase sequence of a circuit is identified using a(n) _______.

Phase rotation tester

A(n) _______ _______ is used to take electrical readings at specified intervals.

Recording instrument

Clamp-on ammeters operate by _______.

Sensing the strength of the electromagnetic field around the wire

A(n) _______ _______ is used to extend the range of a meter movement for current measurement

Shunt resistor