3-L-075: Test Equipment
3-75L1:
How is a frequency counter used?
To measure the time between events, or the frequency, which is the reciprocal of the time.
To provide reference points on an analog receiver dial thereby aiding in the alignment of the receiver.
To heterodyne the frequency being measured with a known variable frequency oscillator until zero beat is achieved, thereby indicating the unknown frequency.
To measure the deviation in an FM transmitter in order to determine the percentage of modulation.
3-75L2:
What is a frequency standard?
A device used to produce a highly accurate reference frequency.
A well-known (standard) frequency used for transmitting certain messages.
A device for accurately measuring frequency to within 1 Hz.
A device used to generate wide-band random frequencies.
3-75L3:
What equipment may be useful to track down EMI aboard a ship or aircraft?
Portable AM receiver.
Fluke multimeter.
An oscilloscope.
A logic probe.
3-75L4:
On an analog wattmeter, what part of the scale is most accurate and how much does that accuracy extend to the rest of the reading scale?
The accuracy is only at full scale, and that absolute number reading is carried through to the rest of the range. The upper 1/3 of the meter is the only truly calibrated part.
The accuracy is constant throughout the entire range of the meter.
The accuracy is only there at the upper 5% of the meter, and is not carried through at any other reading.
The accuracy cannot be determined at any reading.
3-75L5:
Which of the following frequency standards is used as a time base standard by field technicians?
Rubidium Standard.
Quartz Crystal.
Cesium Beam Standard.
LC Tank Oscillator.
3-75L6:
Which of the following contains a multirange AF voltmeter calibrated in dB and a sharp, internal 1000 Hz bandstop filter, both used in conjunction with each other to perform quieting tests?
SINAD meter.
Reflectometer.
Dip meter.
Vector-impedance meter.
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