General
What is Rectifier
What is a device or components that convert AC current to DC current
To measure current flow, the ammeter is placed in the circuit (T/F)
True, the ammeter must be part of the flow of current (Except clamp-on ammeter)
What is a GFCI?
Ground Fault Circuit Interrupter
What is a milliamp?
A milliamp is one 1/1000 of an amp
What is the purpose of a 2-channel oscilloscope?
A 2 channel scope can present 2 different signals simultaneously for easier troubleshooting
Hertz
What is the measure of the AC frequency of a circuit
Every electrical circuit should be assumed to be energized (T/F)
True. Each circuit should be tested to assure the circuit is de-energized
An oscilloscope can be used to measure frequency (T/F)
True, an oscilloscope can measure frequency and various electrical parameters
What is a millivolt?
A millivolt is 1/1000 of a volt
What is the maximum current that can be read with a DMM?
Most DMM have a 10 amp limit. You should refer to the DMM documentation.
What is a Continuity test
Used to verify a complete circuit
What is an Ohm Meter
An instrument that measures resistance and also measures the continuity of a circuit
Explain the difference between an analog multimeter and a digital multimeter
Analog multimeter displays the values with a pointer on a scale. Digital meters display the value as a number displayed on screen.
What is the frequency of electrical power produced in the US
60 HZ. In some countries the frequency generated is 50 HZ
What is the most common use of a handheld oscilloscope?
Hand held scopes are mostly used in the field, where a light weight and portable instrument works best.
Multimeter Definition
Portable meter used to measure a variety of electrical properties
How many milliamps are there in 1 amp?
1000 milliamps equals 1 amp
What is a receptacle tester?
Instrument that plugs into a standard 120 VAC outlet to determine if it is properly wired
You should always test the voltmeter on a known voltage prior to troubleshooting. (T/F)
True, this will verify that the voltmeter is functioning correctly.
An Oscilloscope can measure both AC and DC voltages (T/F)
True, both can be measured and displayed with scope
What is a Function Generator
What is a device that provides various wave forms of voltage
A digital multimeter is used to measure volts, amps, frequency, resistance (T/F)
True
A continuity tester (ohmmeter) can be used on both energized and de-energized circuits (T/F)
False, this instrument should only be used on de-energized circuits
Prior to connecting a DMM to a circuit, what should be checked?
Verify that the probes are in the correct location and that the correct function and range is selected
What is the purpose of the vertical position control on scope?
Allows you to move the displayed waveform position vertically on the screen
Non contacting temperature sensor
Non-Contacting temperature sensing instrument. Does not require direct contact. Uses infrared wavelength
An oscilloscope provides a visual image of the circuit resistance (T/F)
False. The scope provides an image of the circuit voltage
What does an Ohmmeter (continuity tester) indicate with the audible sound?
The indication is that the circuit is complete
What must be checked before measuring resistance in a circuit?
The power source must be off.
Handheld oscilloscopes are a combination oscilloscope and digital multi-meter (T/F)
True, this allows the technician to carry one instrument rather than multiple instruments.