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Questions and Answers
What is the relationship between the peak voltage VM and the RMS voltage VRMS for a sine or cosine wave?
What is the relationship between the peak voltage VM and the RMS voltage VRMS for a sine or cosine wave?
- VRMS = 1.414 VM
- VRMS = VM/0.707
- VRMS = 0.707 VM (correct)
- VRMS = 2 VM
What is the main purpose of a decade box?
What is the main purpose of a decade box?
- To generate AC signals
- For load substitution (correct)
- To measure voltage
- To amplify weak signals
What is the significance of the number of sections (dials) on a decade box?
What is the significance of the number of sections (dials) on a decade box?
- It determines the accuracy of the measurement
- It determines the type of component (resistance, capacitance, or inductance)
- It determines the maximum voltage it can handle
- It determines the range of values that can be set (correct)
What type of waveforms is the formula VRMS = 0.707 VM applicable to?
What type of waveforms is the formula VRMS = 0.707 VM applicable to?
What is the purpose of the selector switch on a decade box?
What is the purpose of the selector switch on a decade box?
What is the significance of the symmetry line CD on the oscilloscope?
What is the significance of the symmetry line CD on the oscilloscope?
What is the name of the device used to accurately set resistance, capacitance, or inductance values?
What is the name of the device used to accurately set resistance, capacitance, or inductance values?
What type of decade boxes are available?
What type of decade boxes are available?
What is the minimum pulse width that some logic probes can detect?
What is the minimum pulse width that some logic probes can detect?
How do most IC failures typically show up in a circuit?
How do most IC failures typically show up in a circuit?
What is the advantage of using a logic probe over an oscilloscope?
What is the advantage of using a logic probe over an oscilloscope?
What is the purpose of connecting the croc clip to the 0-V rail in a basic logic probe?
What is the purpose of connecting the croc clip to the 0-V rail in a basic logic probe?
What happens when both LEDs turn on dimly in a basic logic probe?
What happens when both LEDs turn on dimly in a basic logic probe?
What is the function of an oscilloscope?
What is the function of an oscilloscope?
How are pins 7, 8, 9, 12, and 13 of the CD4011 IC connected in the basic logic probe circuit?
How are pins 7, 8, 9, 12, and 13 of the CD4011 IC connected in the basic logic probe circuit?
What is the advantage of using a logic probe in conjunction with an oscilloscope?
What is the advantage of using a logic probe in conjunction with an oscilloscope?
What can be determined by comparing the amplitude of the reflected step in a time-domain reflectometer?
What can be determined by comparing the amplitude of the reflected step in a time-domain reflectometer?
What can be revealed by time-domain reflectometry?
What can be revealed by time-domain reflectometry?
What is the primary function of the IFR NAV-402AP Nav/Comm Test Set?
What is the primary function of the IFR NAV-402AP Nav/Comm Test Set?
What feature does the IFR NAV-402AP offer for VOR testing?
What feature does the IFR NAV-402AP offer for VOR testing?
What type of frequency modes are available in the IFR NAV-402AP signal generator?
What type of frequency modes are available in the IFR NAV-402AP signal generator?
What is the purpose of the sweep LOC DDM function in the IFR NAV-402AP?
What is the purpose of the sweep LOC DDM function in the IFR NAV-402AP?
What type of tester is the IFR NAV-402AP designed to be used as?
What type of tester is the IFR NAV-402AP designed to be used as?
What avionics systems can be functionally tested and calibrated using the IFR NAV-402AP?
What avionics systems can be functionally tested and calibrated using the IFR NAV-402AP?
What is the primary function of the oscillator stage in an RF signal generator?
What is the primary function of the oscillator stage in an RF signal generator?
What type of circuit is used in low-frequency signal generators to produce the correct range of resonant frequencies?
What type of circuit is used in low-frequency signal generators to produce the correct range of resonant frequencies?
What is the purpose of the modulating circuit in an RF signal generator?
What is the purpose of the modulating circuit in an RF signal generator?
What type of modulation is used in specialized signal generators that allow for pulse modulation?
What type of modulation is used in specialized signal generators that allow for pulse modulation?
What does the output-level meter in an RF signal generator indicate and control?
What does the output-level meter in an RF signal generator indicate and control?
What is the range of output readings indicated by the output-level meter in an RF signal generator?
What is the range of output readings indicated by the output-level meter in an RF signal generator?
What is the purpose of the calibrated attenuator in an RF signal generator?
What is the purpose of the calibrated attenuator in an RF signal generator?
What is the typical source of the modulating signal in an RF signal generator?
What is the typical source of the modulating signal in an RF signal generator?
What is one of the functions of an FQI test set when used with a capacitance-type fuel gauging system?
What is one of the functions of an FQI test set when used with a capacitance-type fuel gauging system?
What is the purpose of introducing adequate capacitance in an FQI test set?
What is the purpose of introducing adequate capacitance in an FQI test set?
What is a potential hazard when using an FQI test set?
What is a potential hazard when using an FQI test set?
What does loop resistance testing analyze in cables?
What does loop resistance testing analyze in cables?
What is the primary cause of corrosion in electrical ground paths?
What is the primary cause of corrosion in electrical ground paths?
What is the result of corrosion in electrical ground paths?
What is the result of corrosion in electrical ground paths?
What is the purpose of ensuring correct earthing of the test box when using an FQI test set?
What is the purpose of ensuring correct earthing of the test box when using an FQI test set?
What is the typical power source for FQI test sets?
What is the typical power source for FQI test sets?
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Study Notes
Logic Probes
- Detect and display high-speed transient pulses as small as 10 ns wide
- Connected directly to the power supply of the device being tested, or have internal batteries
- Provide a quick, inexpensive way of locating faults in IC failures
- Can display single, short-duration pulses that are hard to detect on an oscilloscope
Basic Logic Probe
- Can be used to check logic levels during logic gate experiments
- Red LED turns on if the level is high, green LED turns on if the level is low
- If both LEDs turn on dimly, a high-frequency pulse train is being detected
Oscilloscopes
- A sophisticated voltmeter with a two-dimensional graph display
- Used to measure voltage (amplitude) and frequency (time) of an electrical signal
- The peak or maximum voltage seen on the scope face is VM volts
- Vrms = 0.707 VM (for a sine or cosine wave)
Decade Boxes
- An assembly of precision resistors, coils, or capacitors
- Can be set to any desired value within its range
- Used for load substitution
- Types available: resistance, capacitance, and inductance
Decade Resistance Boxes
- Each switch section represents a decade, or a multiple of 10
- Can be set to any desired value within its range
Signal Generators
- Produce a signal that can be accurately set in frequency at any point in the range
- The oscillator stage produces a signal which can be accurately set in frequency
- The modulating circuit produces audio (or video) voltage which can be superimposed on the RF signal
- Modulation types: sine wave, square wave, pulse modulation
Time-Domain Reflectometer (TDR)
- Measures the distance to a fault as well as the nature of the fault
- Indicates the characteristic impedance of the line and whether losses are shunt or series
- Used to locate and analyze connectors and splices
IFR NAV-402AP Nav/Comm Test Set
- A self-contained unit for functional testing and calibration of MKR, VOR, ILS, and COM avionics
- Can be used both as a bench and ramp tester
- Features: signal generator, VOR bearing, LOC-G/S output, sweep LOC DDM
Fuel Quantity Indicator (FQI) Test Sets
- Used to measure capacitance values of individual or sets of tank units
- Inserts appropriate capacitance values of a fuel gauge circuit for functional calibration
- Introduces adequate capacitance to simulate the function of the compensator
- Measures insulation resistance of tank units and cabling
Loop Resistance Testers
- Analyze circuits of cables by measuring and recording the resistance at two locations within a loop
- Used to detect corrosion in electrical ground paths
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