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88 Cards in this Set
- Front
- Back
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 whom?
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Test measurement and diagnostic support center.
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When can a shop stadard be used for routine maintance 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 uses what?
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Built in heaters.
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Which test equipment is most likley to be tropicalized and fungus proofed?
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Laminated circuit board.
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What is normally not effected by storing test equipment accessories improperly?
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Maintenance procedures.
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Of what should you be aware of when taking voltage measurements?
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A voltometer of low sensitivity used in low range may render a ciruit inoperable.
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Before measuring a resistance, you must sometimes usolder one side of a resistor in order to prevent what?
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Erroneous readings.
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In troubleshooting equipment, which measurements are not commonly taken?
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Fequency and waveform
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What is the problem in measuring current whith a multimenter 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 test set?
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Frequency counter.
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Name the three main troubleshooting aids?
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1. Checkout and alignment procedures.
2. Fault indicators 3. Flow charts |
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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 maintenace inspections because they reveal what?
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Slow progressive drifts that may be too small to show up on one test.
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What troubleshooting technique would be used to isolate a circuit card or modular failure?
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Internal diagnostic checks.
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What type of tests would you do to isolate a defective component?
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Resistance, voltage, and waveform measurments/comparisons.
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The resistance values provided in most TO resistance charts are normally measured where?
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Between two indicated points.
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What saftey practices must be observed before making resistance checks?
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Ensure the power is turned off and discharge all filter capacitors.
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Regaurdless of the size of a circuit you are troubleshooting, you can immediately isolate the defective half of the unit by which troubleshooting method?
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Half-split method.
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Which analog multimeter control do you use for AC/DC voltages. current, and resistance measurements?
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Function switch.
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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 the meter to its normal operation?
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Reset button.
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When you make a resistance measurement, how do you electrically 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 test 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 voltages exist?
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Amplifier.
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Which feature of the Fluke 8025A's multimeter do you use to select various measurement 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 measurement 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 need to 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 an audible tone?
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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, and depth = intinsity.
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Which mode of triggering an oscilloscope causes a trace to be drawn on the screen at all times, whether or not there is an input signal?
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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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Which control should you adjust if the display is too tall (extends off screen)?
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Volts/cm
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Which oscilloscope probe is essentially just a shielded pieces of wire?
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Passive 1:1 probe
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Which probe lets you use the oscilloscope to measure high voltage level, raises the input impedance, does not require 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 what situation 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- percent amplitude points on the leading or trailing edge of the pulse.
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If the wave signal's positive alternation covers 2.5 time divisions and the TIME/DIV is set to 20nS, what is the signals frequency?
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10MHz
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In using an oscilloscope to compare two signals, if the Lissajous pattern has 3 bumps on the axis and 4 on the other are the signals the same?
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No, 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 devices
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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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What area of a digital storage oscilloscope takes digitized samples and performes numerous manipulations on the data?
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Microprocessor
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What type of sampling does a digital storage oscilloscope normally use on 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 to measure pulse waves?
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Linear
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What are the three types of digital storage oscilloscope acquisition modes, and which is the standard operation 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 aquiring a 4K record length on a digital storage oscilloscope, how many samples can you view at a 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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To provide an error detection system to determine the quality of recieved data.
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The internal clock gererator has a major roll of what test?
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The bit error rate test.
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What test equipment item provides a patterned digital test signal for loop data quality?
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BERTS
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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 accepts a 48-bit parallel word and generates a serial pattern?
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48-bit transmitter only.
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What pattern synchonizer and error counter section of the bit error rate test set internally generates its own pattern to compare with the recieved data from the data/clock recievers?
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PRN pattern synchronizer/comparator
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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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What pattern simulator section of the bit error rate test set converts the NRZ-L data into the desired coding, such as NRM-M?
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Code converter
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What are the primary means of measuring the quality of transmitted digital information, and how is it derived?
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Bit error rate (BER), the ratio of the number of bits in error to toatal 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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Durring 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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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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20Hz to 20 kHz
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What componets 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 resistor and capacitor (RC circuit) with the capacitor as the variable element.
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A radio frequecy generator is used to?
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Align telementry receivers.
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What is the variable voltage range of signals output from the HP 3325B 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 a maximum of?
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+-5 V
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In using the phase modulation controls of the HP 3325B generator, an input of a +- 5 V peak would result in what approximate phase deviation?
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+-425 deg. per volt for square wave.
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The 10:1 power ratio represented by 1 bel can also be represented by how may decibeels?
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10 dB
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A power reading that uses the abbreviation dBm indicates?
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The ratio of decibels relative to a 1 milliwatt standard.
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The measurable frequency and power ranges of the HP 436A power meter are determined by?
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The power sensor.
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The most efficient power sensor for converting RF energy to the DC voltage measured by the HP 436A power meter is?
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The 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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Which triggering 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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Which triggering 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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Besides the per division mode, what are the other two scan modes available through the FREQUENCY SPAN/DIV ccontrol on a spectrum analyzer?
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Maximum and 0Hz
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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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Totalized
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A time domain reflectometer will not detect cable ______.
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Ground
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What principal does the time domain reflectometer use to test cables?
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Radar
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What type of deflection return on the TDR CRT wouldd 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 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 fibre after fibre insertion?
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REAL-TIME mode
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When will the pattern synchronizer and error counter error/IN SYNC section of the bit error rate test set provides 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, read/enter pulse.
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