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100 Cards in this Set

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  • Back
#01. Where are the explicit operating instructions for test equipment, and which TO tells you where to find further information?
Applicable technical orders; 0-1-33-1
#02. Repair and calibration of test equipment is the responsibility of the
Test and calibration center
#03. When can a shop standard be used for routine maintenance functions?
if an emergency condition exists and like test equipment is inoperative.
#04. To eliminate moisture, most complex items of electronic test equipment use
built in heaters
#05. Which test equipment item is most likely to be tropicalized and fungus-proofed?
Laminated circuit board
#06. Which of these is usually not affected by storing test equipment accessories improperly?
Maintenance procedures
#07. Of what should you be aware in taking voltage measurements?
A voltmeter of low sensitivity used on a low range may render circuits inoperable.
#08. Before measuring a resistance, you must sometimes unsolder one side of a resistor in order to
prevent erroneous readings
#09. In troubleshooting equipment, which of these measurements are not commonly taken?
Current
#10. What is the problem in measuring current with a multimeter with handheld probes?
High risk of electrical shock
#11. Which test set can you use to check the frequency of a transmitter?
Frequency counter
#12. Which component is not a troubleshooting aid?
System and unit programs
#13. What is the most important step in the troubleshooting effort?
Think before you act
#14. In the established general troubleshooting procedures, steps 1 through 4 are used in
locating the trouble
#15 What are functional inspections?
Inspections done through periodic tests.
#16. Its important to document periodic maintenance inspections because they reveal
slow progressive drifts that may be too small to show up in any one test
#17. What trouble shooting technique would be used to isolate a circuit card or module failure?
Internal diagnostic checks
#18. What type of tests would you do to isolate a defective component?
Resistance measurement, voltage measurement, and waveform comparisons
#19. The resistance values provided in TO resistance charts are normally measured between
the indicated point and ground
#20. What safety practices do you observe before making resistance checks?
Ensure the power is turned off and discharge all filter capacitors
#21. Regardless of the size of the circuit you are troubleshooting, you can immediately isolate the defective half of a unit by which troubleshooting technique?
Half-split method
#22. Which analog multimeter control do you use for AC/DC voltages, current and resistance measurements?
Function switch
#23. Which control on the analog multimeter calibrates the meter's pointer to zero for a resistance measurment?
Zero ohms switch
#24. Which analog multimeter control must you depress to remove an overload condition and return the meter to its normal operation?
Reset button
#25 When you make a resistance measurement, how do you electrically isolate a resistor from the circuit?
Disconnect one side of the resistor
#26. How do you place multimeter test leads in a circuit to measure voltage?
Parallel
#27. In which type of circuit would you measure the AC component of an output voltage where both AC and DC voltage levels exist?
Amplifier
#28 Which feature of the fluke 8025A multimeter do you use to select various measurement functions?
rotary switch
#29. Which part of the Fluke 8025A's display section indicate the absolute value of the input?
Analog bar graph
#30. Which feature of the fluke 8025a's display section indicates the absolute value of the input
Analog bar graph
#31. Which current range on the Fluke 8025A do you select to measure 250 milliamps AC?
Milliamps AC
#32. Which current range on the Fluke 8025A do you select to measure 250 milliamps AC?
Milliamps/amp AC
#33. Which fluke 3024a multimeter function displays "OL" with the leads connected in one direction while reversing them produces a continuous audible tone?
Diode test
#34. How are voltage, time, and depth represented on the oscilloscope display?
Voltage=vertical axis, time=horizontal axis, and depth=intensity
#35. Which mode of triggering an oscilloscope causes a trace to be drawn on the screen at all times, whether there is an input signal or not?
Auto
#36. Which triggering source would be used to look for power line hum?
Line
#37. Where should the volt/cm (volts/div) control be set to begin with?
Maximum setting
#38. Which control should you adjust if the display is too tall (extends off screen)?
Volts/cm
#40. Which probe lets you use the oscilloscope to measure higher voltage levels, raises the input impedance, does not require a bias voltage, and attenuates noise?
Passive divider, 10:1 probe
#39. Which oscilloscope probe is essentially just a sheilded peice of wire?
Passive 1:1 probe
#41. Which probe does not need to actually make contact with the circuit under test?
Current probe
#42. In which of these situations is probe compensation not necessary?
Any time you have changed test points
#43. Rise time is measured between
10 and 90 percent amplitude points on the leading or trailing edge of the pulse.
#44. If a sine wave signal's positive alternation covers 2.5 time divisions and the TIME/DIV is set to 20 nS, what is the signal's frequency?
10 MHz
#45. In using an oscilloscope to compare two signals, if the Lissajous pattern has 3 bumps on one axis and 4 on the other,
the signals have different frequencies
#46. What digital storage oscilloscope circuit compensates for high sampling rates of high frequency signals?
Charged coupled device
#47. Sampled data points are stored in the memory of a digital storage oscilloscope as
waveform points
#48. What area of a digital storage oscilloscope takes digitized samples and performs numerous manipulations on the data including measuring rise and fall times, periods, time intervals, and math computations?
Microprocessor
#49. What types of sampling does a digital storage oscilloscope normally use on single-shot or seldom-occurring signals?
Real-time
#50. What type of interpolation does a digital storage oscilloscope use to measure pulse waves?
Linear
#51. Which are the three types of digital storage oscilloscope acquisition modes, and which is the standard operating mode?
Sample, peak detect, averaging; sample
#52. Which digital storage oscilloscope button controls all waveforms displayed in the STORE mode?
CURSORS control
#53. In acquiring a 4k record length on a digital storage oscilloscope, how many samples can you view at one time?
1,000
#54. What is the purpose of the bit error rate test set?
Provide an error detection system to determine the quality of received data
#55. What test equipment item provides a patterned digital test signal for loop testing and compares an identical pattern to determine the loop data quality?
BERTS
#56. Which of these is a major section of the typical bit error rate test set?
Internal clock generator
#57. In the internal clock generator section of a typical bit error rate test set, what generates the basic clock that provides all clock phases, and is periodically frequency calibrated by a crystal-controlled oscillator in the automatic calibration section?
VCO
#58. Which pattern simulator section of a bit error rate test set controls the clock selector and selects either the external clock or the internal clock for processing?
Data/clock select encoder
#59. What pattern simulator section of the bit error rate test set accepts a 48-bit parallel word and generates a serial pattern?
48-bit transmitter only
#60. What pattern simulator section of the bit error rate test set converts the NRZ-L data into the desired coding, such as NRZ-M?
Code converter
#61. What pattern synchronizer and error counter section of the bit error rate test set internally generates its own pattern to compare with the received data from the data/clock receivers?
PRN pattern synchronizer/comparator
#62. When will the pattern synchronizer and error counter error/IN SYNC section of the bit error rate test set provide an output to the front panel display, and what interrupts this output?
At the end of the count cycle or when the reset switch is pushed, reset pulse
#63. Which of these are the primary means of measuring the quality of transmitted digital information, and how is this means derived?
Bit error rate (BER), the ratio of the number of bits in error to total number of bits transmitted
#64. What is the first step in the basic bit error rate testing procedure?
A known bit pattern, usually pseudo-random, is generated at the sending end of the data channel or equipment under test and is transmitted through the channel.
#65. During a basic bit error rate testing procedure, an error signal is generated when
any bit in the received signal is not the same as the generated bit
#66. Which of these data circuit speeds would normally use the shorter generated bit error rate (BER) test pattern lengths, and what is data circuit bit rate?
Low to intermediate, 1200 to 9600 bps
#67. Which of these bit rates should you use for a bit error rate test on a 64 Kbps data circuit?
64 Kbps
#68. On the bit error rate test set, the 25-pin connectors are designed to operate with data modems to
simplify connection of test equipment to the modem under test and to carry the necessary signaling and handshake signals for modem operations
#69. The primary use of a signal generator is to
align frequency sensitive or tuned circuits
#70. What is the frequency range of an audio signal generator?
20 Hz to 20 kHz
#71. What components make up the frequency determining device in a signal generator, and which of these elements is usually chosen as the variable element?
A resistor and capacitor (RC circuit) with the capacitor as the variable element
#73. A radio frequency generator is used to
align telemetry receivers
#74. What is the variable voltage range of signals output from the HP 3325B
1 mV to 10 V peak-to-peak
#72. Which one of these is not an application of a radio frequency generator?
Aligning galvanometers
#75. The output of the HP 3325B function generator may generate only DC voltages, to a maximum of
±5 V
#76. In using the phase modulation controls of the HP 3325B function generator, an input of a ±5 V peak would result in what approximate phase deviation?
±425° per volt for square wave
#77. The 10:1 power ratio reprsented by 1 bel can also be represented by how many decibels(dB)?
10 dB
#78. A power reading that uses the abbreviation dBm indicates the
ratio of decibels relative to a 1-milliwatt standard
#79. The measurable frequency and power ranges of the HP 436A power meter are determined by the
power sensor
#80. The most efficient power sensor for converting RF energy to the DC voltage measured by the HP 436A power meter is the
detecing diode
#81. When you connect a new or different power sensor to the HP 436A power meter, you should
immediately calibrate the units together
#82. You are using an HP 436A power meter to troubleshoot a transmitter. You are trying to determine which stage is causing a low power output from the transmitter. To find out how well each transmitter is amplifying, which power meter mode should you select?
Relative power
#83. Which one of these measurments is not made with a spectrum analyzer?
Peak-peak voltage
#84. Which of these measurments do you make with a spectrum analyzer?
Subcarrier oscillator output
#85. Which trigger control on a spectrum analyzer lets the sweep be triggered by an AC power source at a rate equal to the frequency of the power source?
LINE
#86. Which sweep control on a spectrum analyzer do you select to run the sweep only after triggering, with a READY light indication each time it is run?
Single
#87. Beside the per division mode, what are the other two scan modes available through the FREQUENCY SPAN/DIV control on a spectrum analyzer?
Maximum and 0 Hz
#88. On a spectrum analyzer, you select LIN (linear) VERTICAL DISPLAY mode. The VERTICAL DISPLAY reads "5.00/ mV," and there is a signal peak six division above the CRT bottom line. What will the amplitude readout display?
30 mV
#89. Which spectrum analyzer control selects the maximum input level of the analyzer and reduces input signals to an optimum level?
MIN RF ATTEN dB
#90. Which electronic counter measurement represents the average bit-to-bit time of an input signal?
Period
#91. Which electronic counter measurment counts the number of bits in a pulse train?
Totalize
#92. When the display section of a frequency counter receives the first 10 pulses passed from the signal gate, what is sent from the first decimal counting unit to the second decimal counting unit?
A carry pulse
#93. Which of these is not an application of a frequency counter?
Monitoring transducer outputs
#94. A time domain reflectometer will not detect cable
ground
#95. What principle does the time domain reflectometer use to test cables?
Radar
#96. Which push-button(s) would you select to get 125 ohms impedance on the time domain reflectometer?
50 ohms and 75 ohms
#97. What type of deflection return on the TDR CRT would indicate a cable "short?"
Negative "pip"
#98. What do we call the power that is reflected back
Backscatter
#99. How is the signal loss represented in on optical time domain display?
Decibels
#100. Which mode is first used to analyze the fiber after fiber installation?
REAL-TIME mode