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99 Cards in this Set
- Front
- Back
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Where are the explicit operating instructions for test equipment, and which TO tells you where to find further information?
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Applicable technical orders & 0-1-33-1
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Repair and calibration of test equipment is the responsibility of the
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PMEL
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When can a shop standard be used for routine maintenance functions?
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If an emergency condition exists and like test equipment is inoperative
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To eliminate moisture, most complex items of electronic test equipment use
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build-in heaters
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Which test equipqment item is most likely to be tropicallized and fungus-proofed?
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Laminated circuit boards
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Which of these is usually not affected by storing test equipment accessories improperly
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Maintenance procedures
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Of what should you be aware in taking voltage measurements?
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A voltmeter of low sensitivity used on a low range may render circuits inoperable
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Before measuring a resistance, you must sometimes unsolder one side of a resistor in order to
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prevent erroneous readings
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In troubleshooting equipment, which of these measurements are not commonly taken?
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Current
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What is the problem in measuring current with a multimeter with handheld probes?
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High risk of electrical shock
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Which test set can you use to check the frequency of a transmitter?
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Frequency counter
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Which component is not a troubleshooting aid?
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System and unit programs
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What is the most important step in the troubleshooting effort?
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Think before you act
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In the established general troubleshooting procedures, steps 1 through 4 are used in
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locating the trouble
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What are functional inspections?
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Inspections done through periodic tests
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It's important to document periodic maintenance inspections because they reveal
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slow progressive drifts that may be too small to show up in any one test
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What troubleshooting technique would be used to isolate a circuit card or module failure?
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Internal diagnostic checks
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What type of tests would you you do to isolate a defective component?
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Resistance measurement, voltage measurment, and waveform comparisons
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The resistance values provided in TO resistance charts are normally measured between
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the indicated point and ground
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What safety practices do you observe before making resistance checks?
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Ensure the power is turned off and set the meter to the highest range
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Regardless of the size of the circuit you are troubleshooting, you can immediately isolate the defective half of a unit by which troubleshooting technique?
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Half-split method
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Which control on the analog multimeter calibrates the meter's pointer to zero for a resistance measurement?
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Zero ohms switch
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Which analog multimeter control must you depress to remove an overload condition and return meter to its normal operation?
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Reset button
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When you make a resistance measurements, how do you electronically isolate a resistor from the circuit?
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Disconnect one side of the resistor
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How do you place multimeter tests leads in a circuit to measure voltage?
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Parallel
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In which type of circuit would you measure the AC component of an output voltage where both AC and DC voltage levels exist?
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Amplifier
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Which feature of the Fluke 8025A multimeter do you use to select various measurments functions?
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Rotary switch
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Which part of the Fluke 8025A's display section indicates the absolute value of the input?
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Analog bar graph
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Which feature of the Fluke 8025A locks the measurements into the display for viewing and automatically updates the display when you take a new measurement?
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Touch-hold push button
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When you use the Fluke 8025A, which voltage range do you select to measure 50 volts DC?
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Volts DC
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Which current range on the Fluke 8025A do you select to measure 250 milliamps AC?
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Milliamps/amp AC
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Which Fluke 8025A multimeter function displays "OL" with the leads connected in one direction while reversing them produces a continuous audible one?
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Diode Test
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How are voltage, time, and depth represented on the oscilloscope display?
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Voltage = vertical axis, time = horizontal axis, depth = intensity
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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?
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Auto
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Which triggering source would be used to look for power line hum?
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Line
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Where should the volts/cm (volts/div) control be set to begin with?
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Maximum setting
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Which control should you adjust if the display is too tall (extents off screen)?
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Volts/cm
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Which oscilloscope probe is essentially just a shielded piece of wire?
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Passive 1:1 probe
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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?
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Passive divider, 10:1 probe
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Which probe does not need to actually make contact with the circuit under test?
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Current probe
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In which of these situations is probe compensation not necessary?
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Any time you have changed test points
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Rise time is measured between
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10% and 90% amplitude points on the leading or trailing edge of the pulse
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If a sine wave signal's positive alternation covers 2.5 divisions and the TIME/DIV is set to 20 nS, what is the singal's frequency?
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10 MHZ f=1/t
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In using an oscilloscope to compare two signals, if the Lissajous pattern has 3 bumps on one axis and 4 on the other
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the signals have different frequencies
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What digital storage oscilloscope circuit compensates for high sampling rates of high-frequency signals?
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Charged coupled device
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Sampled data points are stored in the memory of a digital storage oscilloscope as
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waveform points
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Wheat 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
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Microprocessor
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What type of sampling does a digital storage oscilloscope normally use on a single-shot or seldom-occuring signals?
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Real-time
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What type of interpolation does a digital storage oscilloscope use the measure pulse waves?
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Linear
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What are the three types of digital storage oscilloscope acquistion modes, and which is the standard operationg mode?
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Sample, peak detect, averaging | sample
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Which digital storage oscilloscope button controls all waveforms displayed in the STORE mode?
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CURSORS control
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In acquiring a 4K record length on a digital storage oscilloscope, how many samples can you view at one time?
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1,000
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What is the purpose of the bit error rate test set?
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Provide an error detection system to determine the quality of received data
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What test equipment item provides a patterned digital test signal for loop testing and compares an identical pattern to determine the loop data quality?
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BERTS
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Which of these is a major section of the typical bit error test set?
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Internal clock generator
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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?
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VCO
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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?
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Data/clock select encoder
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What pattern simulator section of the bit error rate test set accepts a 48-bit parallel word and generates an serial pattern?
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48-bit transmitter only
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What pattern simulator section of the bit error test set converts the NRZ-L data into the desired coding, such as NRZ-m?
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Code converter
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What pattern synchronizer and error counter section of the bit error rate rest set internally generates its own pattern to compare with the received data from the data/clock receivers?
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PRN pattern synchronizer/comparator
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When will the pattern synchronizer and error counter err/IN SYNC section of the bit error rate test set provide an output to the front panel display, and what interrupts this output?
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At the end of the count cycle or when the reset switch is pushed, reset pulse
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Which of these are the primary means of measuring the quality of transmitted digital information, and how is this means derived?
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Bit error rate (BER), the ratio ofthe number of bits in error to total number of bits transmitted
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What is the first step in the basic bit error rate testing procedure?
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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
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During a basic bit error rate testing procedure, an error signal is generated when
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any bit in the recieved signal is not the same as the generated bit
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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
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Low to intermediate, 1200 to 9600 bps
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Which of these bit rates should you use for a bit error rate test on a 64 Kbps data circuit?
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64 Kbps
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On the bit error rate test set, the 25-pin connectors are designed to operate with data modems to
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simplify connection of test equipment to themodem under test and to carry the necessary
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The primary use of a signal generator is to
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align frequency sensitive or tuned circuits
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What is the frequency range of an audio signal generator?
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20 Hz to 20 kHz
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What components make up the frequency determining device in a signal generator, and which of these elements is usually chosen as the variable element?
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A inductor and capacitor (Lc cirucit) with the capacitor as the variable element
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Which of these is not an application of a radio frequency generator?
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Aligning galvanometers
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A radio frequency generator is used to
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align telemtry receivers
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What is the variable voltage range of signals output from the HP3325B synthesizer/function generator?
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1 mV to 10 V peak-to-peak
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The output of the HP 3325B function generator may generate only DC voltages, to an maximum of
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±5V
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In using the phase modulation controls of the HOP 3325B function generator, an input of a ±5V peak would result in what approximate phase deviation?
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-+425 degrees per volt for square wave
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The 10:1 power ratio represented by 1 bel can also be represented by how many decibels (dB)?
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10 dB
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A power reading that uses the abbreviation dBm indicates the
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ratio of decibels relative to a 1-milliwatt standard
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The measureable frequency and power ranges of the HP 436A power meter are determined by the
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power sensor
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The most efficient power sensor for converting RF energy to the DC voltage measured the HP 436A power meter is the
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detecting diode
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When you connect a new or different power sensor to the HP 436A power meter, you should
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immediately calibrate the units together
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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 stage is amplifying, which power meter mode should you select?
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Relative power
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Which on e of these measurements is not made with a spectrum analyzer?
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Peak-peak voltage
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Which of these measurements do you make with a spectrum analyzer?
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Subcarrier oscillator output
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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?
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LINE
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Which sweep control on a spectrum analyzer do you select to run the sweep only once after triggering, with a READY light indication each time it is run?
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Single
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Besides the per division mode, what are the other two scan modes available through the FREQUENCY SPAN/DIV control on a spectrum analyzer?
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Maximum and 0 Hz
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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 divisions above the CRT bottom line. What will the amplitude readout display?
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30 mV
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Which spectrum analyzer control selects the maximum input level of the analyzer and reduces input signals to an optimum level?
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MIN RF ATTEN dB
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Which electronic counter measurement represents the average bit-to-bit time of an input signal?
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Period
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Which electronic counter measurement counts the number of bits in a pulse train?
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Totalize
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When the display section of a frequency counter receives the first 10 pulses passes from the signal gate, what is sent from the first decimal counting unit to the second decimal counting unit?
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A carry pulse
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Which of these is not an application of a frequency counter?
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Monitoring transducer outputs
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A time domain reflectometer will not detect cable
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ground
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What principle does the time domain reflectometer use to test cables?
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Rader
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Which push-button(s) would you select to get 125 Ohms impedance on the time domain reflectometer?
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50 Ohms and 75 Ohms
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What type of deflection return on the TDR CRT would indicate a cable "short?"
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Negative "pip"
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What do we call the power that is reflected back?
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Backscatter
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How is the signal loss represented in on optical time domain reflectometer display?
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Decibels
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Which mode is first used to analyze the fiber after fiber insertion?
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REAL-TIME mode
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