Meters

A digital meter displays a numerical value. True or false?

True.

Circuit or component resistance can be measured using an ohmmeter. True or false?

True.

Is it necessary to de-energize a circuit before connecting a series ammeter into it?

Yes

A meter that displays a definite numerical value is:

a digital meter.

Meter readings are displayed numerically on:

a digital meter.

When the voltage across a circuit component is to be measured, the voltmeter is connected:

across (in parallel with) the component.

Correct polarity connections ____ important for wattmeter measurements.

are

Polarity must be observed when taking voltage and current measurements in a:

dc circuit.

A clamp-on ammeter ____ require you to open the circuit.

does not

If a circuit has a dc supply, correct series ammeter polarity connections must be observed to prevent the pointer on an analog scale from swinging:

downscale

When using a clip on ammeter to measure the current drawn by a lightbulb in a two wire circuit the jaws of the meter must surround:

either the ground or ungrounded circuit conductors.

When using a megohmmeter to perform an insulation test on a conductor one lead of the megohmmeter is connected to the conductor itself and the other lead is connected to:

ground or reference point.

The mirror strip on a meter is used to:

help sight alignment which reduces parallax error.

A megohmmeter produces a____ voltage output.

high

When using an ohmmeter to measure the resistance of a resistor, polarity ____ important.

is not

Nonlinear scales are usually characteristic of:

meters used for resistance measurement.

An analog meter uses a ___ and a calibrated ____ to indicate electrical values.

pointer, scale.

You are required to open a circuit when connecting a ____.

series ammeter

The portion of an ohmmeter scale which will provide the greatest accuracy of measurement is:

the portion to the right of center.

When unsure of the magnitude of the circuit quantity being measured, it is advisable to:

use the highest ranges of the meter.

Electrical power is measured directly with:

wattmeter.

A linear scale has divisions that are unequally spaced. True or false?

False.

Circuit ampacity is measured with a voltmeter. True or false?

False.

What are the four factors to consider before you take a measurement with a meter?

1. Required electrical measurement. 2. Circuit energized or de-energized. 3. Expected value. 4. Importance of value.

If a digital display shows a resistance measurement of 35 kohms, what is the value in ohms?

35000 ohms.

The majority of megohmmeters have output voltages of:

500 V to 1000 V.

Most ohmmeters have the numbers on their scales arranged in ascending order from left to right. True or false?

False.

Parallax air can occur when a digital meter is being used. True or false?

False.

An analog ohmmeter must be zeroed each time a new resistance multiplier setting is chosen. How do you zero this ohmmeter?

Hold the meter leads together and then turn the adjustment knob until the needle is positioned on zero.

Ammeter

Measures current.

Wattmeter

Measures electrical power.

Megohmmeter

Measures high resistances.

Ohmmeter

Measures resistance.

Voltmeter

Measures voltage.

What state should the circuit be in when using an ohmmeter?

Off.

What does it mean if a digital meter displays OL?

Over the limit.