Term
| When you use the Fluke 8025A, which voltage range do you select to measure 50 volts DC? |
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Definition
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Term
| Which part of the Fluke 8025A's display section indicates the absolute value of the input? |
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Definition
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Term
| Which feature of the Fluke 8025A multimeter do you use to select various measurement functions? |
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Definition
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Term
| How do you place multimeter test leads in a cicuit to measure voltage? |
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Definition
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Term
| When you make a resistance measurement, how do you electrically isolate a resistor from the circuit? |
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Definition
| Disconnect 1 side of the resistor |
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Term
| Which analog multimeter control compensates for the voltage of the internal batteries when calibrating for resistance measurements? |
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Definition
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Term
| What logorithmic expression do we use to specify the ratio of power loss in fiber optic cables? |
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Definition
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Term
Propagation of light as seen by Snell's Law is known as what? |
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Definition
Total internal reflection |
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Term
| The angle between the normal in the first material and the ray that is bounced back in the first material is called the what? |
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Definition
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Term
| What component of fiber optic cable provides the reflective surface that allows light to propagate? |
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Definition
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Term
| What is a security feature of using fiber optic cable |
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Definition
| Virtually impossible to tap a fiber optic cable unnoticed |
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Term
| Which statement describes an advantage of using fiber optic cable? |
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Definition
| Electromagnetic fields do not affect fiber optic cables |
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Term
| When using forward error control as a method of error correction, where does error correction take place? |
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Definition
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Term
| By using 16-PSK, how many bit combos are allowed to be used? |
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Definition
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Term
| What is the formula to find the modulating index? |
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Definition
Deviation Freq. of mod. signal |
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Term
| How does synchronous transmission reduce the overhead costs of data transmission? |
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Definition
| Blocks many characters together for transmission |
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Term
| When using vertical redundancy check, what significance does the amount of ones have in a data bit pattern? |
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Definition
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Term
| Using the longitudinal redundancy check method of error correction, what does the receiver compare with the transmitter to ensure an accurate transmission of data? |
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Definition
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Term
| The MOST useful way to classify fiber optic cables is by what? |
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Definition
| refractive index profile and number of modes |
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Term
| What type of fiber is the least efficient, with the highest dispersion & has a core diameter of 30μm to over 800μm? |
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Definition
| multimode step-index fiber |
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Term
| What type of fiber has a core diameter of 50-125μm & consists of numerous concentric layers of glass, something like the annular rings of a tree configured to reduce dispersion? |
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Definition
| Multimode graded-index fiber |
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Term
| What part of the pulse code modulation process converts a continuous time signal into a discrete time signal? |
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Definition
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Term
| By using 8-PSK instead of binary phase shift keying, information capacity is increased how many times? |
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Definition
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Term
| The relationship of the bandwidth required for double-sided emitted carrier (DSBEC) AM to the bandwidth of the modulating signal of the AM bandwidth alone is what? |
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Definition
Twice the modulating bandwidth |
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Term
| What purpose of modulation prevents interference when sharing the same communications path? |
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Definition
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Term
| What purpose of modulation involves modulatin low freq. signals for transmission over long distances? |
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Definition
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Term
| Sample data points are stored in the memory of a digital storage oscilloscope as what? |
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Definition
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Term
| In acquiring a 4K record length on a digital storage oscilloscope, how many samples can you view at one time? |
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Definition
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Term
| What pattern simulator section of the bit error rate test set converts the NRZ-L data into the desired coding, such as NRZ-M? |
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Definition
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Term
| What color is used to mark sewer and drain lines? |
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Definition
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Term
| Why is it important to mark underground facilities, when the earth's surface is moved, removed, or displaced? |
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Definition
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Term
| Which push-button would you select to get 125Ω impedance on the time domain reflectometer? |
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Definition
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Term
| Which electronic counter measurement represents the average bit-to-bit time of an input signal? |
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Definition
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Term
| What is the frequency range of an audio signal generator? |
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Definition
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Term
| On the bit error rate test set, the 25-pin connectors are designed to operate with data modems to what? |
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Definition
| Simplify connection of test equipment to the modem under test & to carry the necessary signaling & handshake signals for modem operations |
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Term
| What bit rate do you use for a BER test on a 64Kbps data circuit? |
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Definition
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Term
| What pattern simulator section of the bit error rate test set accepts a 48-bit parallel word & generates a serial pattern? |
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Definition
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Term
| In the internal clock generator section of a typical bit error rate test set, what generates the basic clock that provides all clock phases, & is periodically frequency calibrated by a crystal controlled oscillator in the auto calibration section? |
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Definition
Voltage Controlled Oscillator |
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Term
| 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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Definition
| Data/Clock select encoder |
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Term
| How are voltage, time, and depth represented on the oscilloscope display? |
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Definition
Voltage = vertical axis Time = horizontal axis Depth = intensity |
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Term
| When using the AN/PSM-2 megger, how do you know you are applying the correct regulated output voltage? |
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Definition
| Turn the hand-crank at a rate to keep the indicator lights at a steady glow. |
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Term
| What can low-insulation resistance between conductors cause? |
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Definition
High-attenuation, crosstalk, and noise |
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Term
| What are the 3 types of digital storage oscilloscope acquisition modes, & which is the standard operating mode? |
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Definition
| Sample, peak detect, averaging; sample |
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Term
| What pattern synchronizer and error counter section of the BER test set internally generates its own pattern to compare w/ the received data from the data/clock receivers? |
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Definition
| PRN pattern synchronizer/ comparator |
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Term
| Which is the primary means of measuring the quality of transmitted digital information, & how is the means derived? |
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Definition
| BER, the ratio of the number of bits in error to total number of bits transmitted |
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Term
| What is the 1st step in the basic BER testing procedure? |
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Definition
| A known bit pattern, usually pseudo-random, is generated at the sending end of the data channel or equipment under test & is transmitted through the channel |
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Term
| Which of these data circuit speeds would you normally use the shorter generated bit error rate test pattern lengths, & what is data circuit bit rate? |
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Definition
| Low to intermediate; 1200-9600bps |
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Term
| What application does a radio frequency generator not do? |
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Definition
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Term
| What is a radio frequency generator used to do? |
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Definition
Align telemetry receivers |
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Term
| What measurement does a spectrum analyzer not do? |
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Definition
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Term
| What measurement do you make with a spectrum analyzer? |
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Definition
| Subcarrier oscillator outputs |
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Term
| Which electronic counter measurement counts the number of bits in a pulse train? |
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Definition
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Term
| What principle does the time domain reflectometer use to test cables? |
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Definition
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Term
| What type of deflection return on the TDR CRT would indicate a cable "short"? |
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Definition
Downward reflections "pip" |
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Term
| What do we call the power that is reflected back to an optical source in the time domain reflectometer? |
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Definition
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Term
| In FM, the amount of the oscillator frequency change is... |
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Definition
| Directly proportional to the amplitude of the modulating signal |
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Term
| In Phase Modulation, the carrier's... |
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Definition
| Phase is shifted at the rate of the modulating signal |
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Term
| The four steps of pulse code modulation are what? |
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Definition
| Bandwidth limiting, pulsing, quantization and encoding |
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Term
| What is the difference between vertical redundancy check (VRC) and longitudinal redundancy check (LRC)? |
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Definition
| VRC checks each character for odd parity; LRC checks the entire horizontal line within a block for odd or even parity |
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Term
| What error detection method is used for checking a data block greater than 512 and is about 99% effective in most applications? |
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Definition
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Term
| What type of buffer allows the fiber optic cable to be twisted or pulled with little stress on the fiber? |
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Definition
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Term
| The bending of light as it passes from one transparent material into another of different densities is called what? |
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Definition
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Term
| Insulation resistance increases if what happens? |
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Definition
| Thickness of the insulating material increases |
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Term
| What type of megohmeter do you use on paper insulated conductor cable? |
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Definition
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Term
| What position of the input coupling switch do we use to view digital-type or square-wave signals? |
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Definition
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Term
| Which probe does not need to actually make contact with the circuit under test? |
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Definition
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Term
| What is the range of record points the Tektronic 2230 digital storage oscilloscope can aquire? |
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Definition
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Term
| What is used to match the input impedance of a circuit under test? |
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Definition
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Term
| What is the variable voltage range of signals output from the HP 3325B synthesizer/function generator? |
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Definition
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Term
| A power reading that uses the abbreviation dBm indicates the.... |
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Definition
| Ratio of decibels relative to a 1-milliwatt standard |
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Term
| What advantage do the spectrum analyzer's sensitivity and wide dynamic range provide? |
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Definition
| A way to measure low-level modulation |
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Term
| How is the signal loss represented in an optical time domain reflectometer display? |
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Definition
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