DMP

On most DMMs, the resistance mode shares the function switch position with another DMM mode.

True

A "digital multimeter (DMM)" is a test tool used to measure _____ or more electrical values.

Two

The exact amount of acceptable direct-current voltage variation depends upon the _____.

Application

A DMM measures resistance with the _____ de-energized.

Circuit and component

A "decibel (dB)" is the measure of the strength of one _____ signal compared to another.

Electronic

"Current" is the amount of _____ flowing through an electrical circuit.

Electrons

"Resistance (R)" is the opposition to the flow of _____ in a circuit.

Electrons

"Ghost (stray) voltage" is a voltage reading on a DMM that is not connected to a(n) _____ circuit.

Energized

IEC standard 61010 classifies the applications in which DMMs may be used into _____ measurement categories.

Four

DMMs can be broadly classified as _____ DMMs.

General purpose, standard, advanced

Electrical circuits are _____ to safeguard equipment and personnel against the hazards of electric shock.

Grounded

Alternating-current voltage measurement procedures may vary slightly with different DMMs.

True

A "transient voltage" (voltage spike) is a(n) _____ voltage in an electrical circuit.

temporary, undesirable

Characteristics of a general-purpose DMM include _____.

the ability to measure two or more basic electrical quantities, a continuity test mode, a display usually limited to three digits

A numerical reading on a display cannot indicate contact bounce because most displays require more than _____ ms to update measurements.

250

A bar graph reading on a display is updated approximately _____ times per second depending on the DMM type.

30 to 40

An "AC sine wave" is a symmetrical waveform that contains _____.

360 degree

"Capacitance Measurement mode" is a DMM mode used to measure capacitance or test resistance.

False

The "_____," or effective value, of a sine is the voltage value that produces the same amount of heat in a pure resistive circuit as direct current of the same value.

Root means square

The advantage of a clamp-on ammeter or a DMM with a clamp-on current probe accessory is that readings can be taken more _____ without opening or interrupting the circuit.

Safely

Some DMMs can simultaneously measure and display both the alternating-current and direct-current components of a signal _____. separately

Separately or combined AC and DC RMS

Care is required to protect the _____ when measuring alternating current or direct current with an in-line ammeter.

User, circuit, and ammeter

"Root-mean-square" is the value equal to _____ of the of the amplitude of a measured value.

.707

A dB measurement requires first taking a measurement at the input and using the Relative (REL) mode to establish a stored reference value of _____ dB.

0

Both clamp-on ammeters and DMMs with a clamp-on current probe accessory are commonly used to measure currents from _____.

1.00A (or less) to 3,000A

Direct-current voltages exceeding _____ are used in specialized applications such as small electric railway systems and large railway systems.

180 Volt

A DMM with a dB measurement function can be used to measure the change (gain or loss) in output from a(n) _____.

Amplifier, signal generator, and other electronic devices.

The term "_____" refers to a decrease in the amplitude of a signal.

Attenuation

"Input AlertTM" is a constant _____ warning emitted by a DMM is test leads are connect in current jacks and a non-current mode is selected.

Audible

The main advantage of using the continuity test mode is that a(n) _____ response is sometimes more desirable than reading a resistance measurement.

Audible

Alternating-current voltage can be measured with a(n) _____ DMM.

Average responding and true rms

Some DMM displays include a _____, which is a graph composed of individual segments that functions as an analog pointer, to indicate changes and trends in a circuit.

Bar graph

"_____" is the ability of a component or circuit to store energy in the form of an electrical charge.

Capacitance

"Ohm's law" is the relationship between voltage (E), current (I), and resistance(R) in a _____.

Circuit

Most DMMs have fuses that become part of the current-measuring _____.

Circuit

"_____" is the presence of a complete path for current flow.

Continuity

When testing for _____, the DMM beeps based on the resistance of the component under test.

Continuity

A "clamp-on ammeter" is a meter that measures _____ in a circuit by measuring the strength of the magnetic field around a single conductor.

Current

"Tagout" is the process of placing a _____ tag on the source of electrical power, which indicates that the equipment may not be operated until the tag is removed.

Danger

An "_____" is a discharge of electric current across an air gap.

Electric Arc

An open switch has continuity.

False

Digital multimeters (DMMs) display readings as exact alpha-numeric values.

False

Direct-current voltage is measured with a DMM using standard procedures, the first of which is to set the function switch to AC voltage.

False

In general, all alternating-current voltage sources vary from fluctuation in direct-current voltage over power distribution systems.

False

Ohm's law and the power formula are limited to circuits in which electrical continuity is the only significant opposition to the flow of current.

False

The "flash protection boundary" is the distance at which personal protective equipment (PPE) is optional to prevent burns when an arc occurs.

False

To measure alternating-current voltages with a DMM, first set the function switch to DC voltage.

False

The "trigger level" is the _____ level at which the DMM counter is triggered.

Fixed

"_____" is the total opposition of any combination of resistance, inductive reactance, and capacitive reactance offered to the flow of alternating current.

Impedance

When using clamp-on ammeters, separate conductors under test from other surrounding conductors by a few _____ whenever possible.

Inches

"_____" is the property of a circuit that causes it to oppose a change in current due to energy stored in a magnetic field.

Inductance

DMMs have a high _____ when set to measure alternating-current voltage.

Input impedance

Most DMMs have a(n) _____ screen.

LCD

"MIN MAX Recording mode (MIN MAX)" is a DMM mode that captures and stores the lowest and highest measurements for _____.

Later display

"Lockout" is the process of removing the source of electrical power and installing a _____ that prevents the power from being turned on.

Lock

Some meters include a _____ alternating-current voltage measurement setting.

Low-impediance

The minimum and maximum quantity that a DMM can safely and accurately measure is known as the "_____ range."

Measuring

If DMM test leads do not match the polarity of the direct-current voltage point being tested, a(n) _____ sign appears to the left of the direct-current voltage measurement displayed.

Negative

"DC voltage" is voltage that flows in _____ direction(s) only.

One

An "ampere" is the number of electrons passing a given point in _____ second(s).

One

"_____" is a condition that exists in an electrical circuit when the normal load current is exceeded.

Overcurrent

The resistance of all components connected in _____ with the component tested affects (usually lowers) the resistance reading.

Parallel

The "_____" of a sine wave is the maximum value of either the positive or negative alternation.

Peak voltage value

"Duty Cycle mode (duty factor)" is an alternative frequency counter mode that measures the _____ a circuit is ON or OFF during a specified period of time.

Percentage of time

In troubleshooting applications, Ohm's law can be used to determine how a circuit should operate and how it is operating under _____.

Power

The power formula is useful for determining expected current values because most electrical equipment lists a _____.

Power rating and voltage

Errors can occur when reading the digital display of a DMM if _____ displayed are not properly interpreted.

Prefixes, symbols, decimal points

An advanced DMM can be used for standard DMM applications, troubleshooting complex problems, and identifying conditions that lead to _____.

Problems

A "_____" is a device that converts alternating-current voltage to direct-current voltage by allowing voltage and current to move in one direction only.

Rectifier

"Cold resistance" is the _____ of a component when operating current is not passing through the device.

Resistance

A DMM in resistance mode automatically begins to take a(n) _____ measurement, even before the test leads are connected to the component to be tested.

Resistance

DMMs commonly use _____ to represent a quantity or term for quick recognition.

Standard Abbreviation

A standard DMM is useful for _____.

Taking measurements and troubleshooting

The resistance measurement displayed by the DMM is the total resistance through all possible paths between the ______.

Test Leads

_____ is the relationship between power (P), voltage (E), and current (I) in an electrical circuit.

The power formula

Knowing the current measurement in a system, component, circuit, or part of a circuit is very useful when _____.

Troubleshooting and testing

"Personal protective equipment (PPE)" is clothing and/or equipment worn by a technician to reduce the possibility of injury in the work area.

True

In some application, direct-current voltage measurements may be taken in circuits that include alternating-current voltage.

True

The bar graph is used when quickly changing signals cause the numerical display to flash or when a change in the circuit is too rapid for the numerical display to indicate.

True

Unlike alternating-current voltages that can generally vary between -10% and +5% of the power source rating without causing any problems, even small direct-current _____ variations may indicate a problem.

Voltage

The primary difference between alternating-current voltage and direct-current voltage is the _____.

Voltage source

A DMM is commonly used for measuring electrical quantities such as _____ in electrical and electronic circuits.

Voltage, Amperage, Resistance

Ohm's law can be used for determining voltage, current, or resistance requirements _____.

during circuit design and for predicting circuit characteristics before power is applied

A "voltage surge" is a _____ voltage that temporarily exists on one or more power lines.

higher-than-normal