Common Test Equipment (2018) Flashcards
The process of comparing test equipment to a standard of higher accuracy is known by what term?
Calibration
Test equipment requiring calibration or repair should be forwarded to what IMA work center
670
What are the general rules for the handling of test equipment?
- Use test equipment properly and only for its designed purpose.
- Select the proper range for the measured quantity.
- Protect the equipment from physical harm that may result from dropping, falling, or other misuse.
- Store test equipment in a clean, dry place with dust covers attached.
- Use the test equipment instruction manual.
True-rms meters are used to measure what types of signals?
Nonsinusoidal signals
What factor must you take into account when measuring high frequency ac signals?
The frequency response of the meter being used
When measuring voltage with a DMM, how should the test leads be placed with regard to the circuit?
Across the load or power source (in parallel with the circuit)
A test lead should be replaced when the resistance measured is greater than what value?
Greater than ohms
When taking resistance readings of a circuit the technician should ensure the circuit is in what condition prior to taking any measurements?
off
When current measurements are made with a multimeter, the test leads should be placed in what configuration in regards to the circuit being tested?
In series with circuit being measured thus allowing all the circuit current to flow through the meter circuitry
When a multimeter makes a beeping sound when the continuity across the contacts of a switch is checked, the switch is in what position?
The closed position
What is the purpose of a megger?
To measure the current leakage of the insulation by providing a high voltage to a component under test
Identify at least two components that can be tested with a megger.
- Capacitors,
- insulated cables,
- antennas,
- insulators,
- high-resistance ground components
A megger consists of what two major elements?
- A generator
- indicating meter
With the test leads connected to the megger and shorted together, what should be the resistance of the leads?
about 0 ohms
What action must be performed following completion of a megger test on equipment having considerable capacitance to avoid dangerous shock?
The equipment should be grounded or shorted
What is the major difference between the MJ10 megger and the BM12 megger?
The MJ10 generates voltage with a hand-driven generator and the BM12 uses a generator driven by six 1.5-Vdc batteries
Electronic counter can measure frequency up to what maximum value?
46 GHz
What are at least three measurement functions an electronic counter can perform in addition to frequency measurements?
- Period
- ratio
- time interval
- time interval delay
- interval average
- totalize
What is the heart of an electronic counter?
The internal crystal oscillator (oven oscillator) or time base
By what means is the crystal oscillator frequency kept stable when the electronic counter is not being used?
By keeping the counter connected to power
What are two types of counters used by the Navy?
- conventional counter
- reciprocal counter
What is the major difference between the two types of counters?
The reciprocal type counter always makes period measurements of the input signal and then takes the reciprocal of that measurement if a frequency
measurement is required whereas the conventional type counter measures the input signal by counting the number of cycles and dividing it by the time interval.
With channel C option on the 5334A the electronic counter is capable of measuring up to what frequency?
1.3 GHz
What is the major application for ratio A/B function?
Measurement of harmonically related signals
What is the preferred instrument to be used to make microwave power measurements?
The power meter
Name the three types of power sensing elements used in conjunction with power meters.
- Thermocouples
- diodes
- thermistors
The diode type power sensor is operated in its square law region for what purpose?
For sensitivity as well as low-noise and drift characteristics
What is the frequency range of thermocouple and diode power sensors?
100 kHz to 110 GHz, depending on the model of sensor used
What is the primary function of an oscilloscope?
To let a technician analyze electrical and electronic signals when the technician troubleshoots or aligns electrical and electronic equipment
Name the three axes of a typical oscilloscope?
The X-, Y-, and Z-axes
What do the three axes of an oscilloscope represent?
X-axis represents time, Y-axis represents amplitude, and the Z-axis represents the intensity or brightness of the signal
Identify at least four items of information that an oscilloscope can tell you about a signal?
- The time of a signal
- The voltage of a signal
- The frequency of a signal
- How often a particular portion of a signal is occurring relative to other portions
- If a malfunctioning component is distorting a signal
- How much of a signal is made of noise
- If noise is changing with time
- How much the signal is made up of ac
- How much the signal is made up of dc
All electronic equipment can be classified into one of what two information categories?
Analog and digital
On an analog oscilloscope, what happens when the signal being analyzed exceeds the frequency range of the oscilloscope?
The display on the CRT becomes dim and very hard to see.
What are the three kinds of oscilloscopes?
- Analog
- digitizing
- digital phosphor
What determines the frequency range of a digitizing oscilloscope?
The sample rate
What advantage does a digitizing storage oscilloscope have over other kinds of oscilloscopes?
The scope can display electrical events that may happen only once.
When an electrical signal is measured with an analog oscilloscope, what section of the oscilloscope controls the attenuation or amplification of the signal being analyzed?
VOLT/DIV control
What section of an analog oscilloscope is used to stabilize a repeating signal?
Trigger level control
What type of oscilloscope uses serial processing?
Digitizing storage oscilloscope
(True or false) The amplitude of a signal is best measured when the signal covers most of the oscilloscope screen horizontally.
False. The signal should cover the screen vertically.
(True or false) Time measurements of a signal are best measured when the signal covers most of the oscilloscope screen horizontally.
True
What are the two axes of a typical spectrum analyzer?
The X- and Y-axis
What do the two axes represent?
X-axis represents amplitude, and Y-axis represents frequency
What information does a spectrum analyzer exhibit?
The spectrum of modulated waves in the radio frequency range and microwave region
What does the term heterodyne mean?
To mix or translate a frequency
The signal being measured by a typical spectrum analyzer is applied to what plates of a CRT?
The vertical plates of the CRT
What is the power and frequency range of the 8562A/B spectrum analyzer?
–119.9 dBm to + 30 dBm and 1 kHz to 22 GHz, respectively
What does the acronym CASS stand for?
Consolidated Automated Support System
List three benefits of CASS.
- Increases repair capabilities
- Increases material readiness
- Reduces the physical space required for electronic testing equipment
What device connects a unit under test (UUT) to the CASS bench?
A test program set (TPS), an interface device, or an accessory
List the standard configurations of CASS benches.
- Hybrid
- Radio frequency (RF)
- Communication/navigation/identification friend or foe (CNI)
- Electro-optics (EO)
What is the purpose of the CASS hybrid test station?
to be a general-purpose test station for the testing of electrical and electronic equipment as well as computers, instruments, and flight control systems
The CASS electro-optics station has the test capabilities of the hybrid station along with capabilities to test what additional equip- ment?
Forward-looking infrared radar (FLIR), lasers/designators, laser range finders, and laser visual systems
