Ultrasonic Equipment Flashcards
Define power supply
Provides voltage from ac or batteries. To drive other instrument circuts.
Define clock
Initiates the chain of events that result in one complete cyle in and ultrasonic test
What does the clock do?
Emits a signal to the time base and pulse , which then is repeated at a given frequency at regular, evenly spaced intervals called pulse repetition rate or update rate.
Define pulser
Sends initial pulse to transducer causing sound to enter test object,( the inital pulse is a fast rising high voltage that activates transducer.
A lower voltage pulse produces better?
Resolution
Define timebase?
Initiates time/distance display on the instruments horizontal scale.
Sound travel time is displayed as
Diatance
Define reciever amplifier
The inital pulse goes to reciever/amplifier after amplification the signal is sent to display
Regardless of the brand, pulse echo instruments have several components in common these include the
A. Generator, pulser, reciever, display and dual probe
B. Power supply, timer, sweep generator, pulser, reciever and display
C. Power supply timer generator pulser reciever and cathode ray tube
D. Timer sweep pulser reciever amplifier and clock circut
B. Power supply timer sweep generator pulser reciever and cathode ray tube
Which of the following provides short duration, high energy pulses which are used to excite the transducer A. The amplifier B. The clock C. The pulser D. The transducer
C. The pulser
Which of the following circuts provides timing signals to the pulser A. The clock B. The amplifier C. The power supply D. The reciever
A. The clock
The pulser (or pulse generator) is the source of short high energy burst of electrical energy applied to the transducer as the outbound energy source that begins the interaction between the test equipment and the material. True or False
True.
The pulse energy transmitted into the test object begins its journey as an electrical impulse of low 100 v medium or high as high as 400 v voltage.
True or False
True
The pulser circuit serves to modify the inbound pulses of energy to the probe and reciever circut.
True or False
False
The \_\_\_\_\_\_\_ voltage pulse produces better near surface \_\_\_\_\_\_\_\_ A. Lower, penetration B. Higher, resolution C. Lower, resolution D. All the above
C. Lower, resolution1
Crt stands for A. Critical registration trigger B. Crystal repetition tenure C. Cathode ray tube D. Computer recognition taser
C. Cathode ray tube
A scan is
A plot of the recieved wave amplitude vs time
A rectified wave does what?
Inverts all of the negative amplitude values to positive
An instrument display in which the horizontal base line represents elapsed time and the vertical deflection represents signal amplitude is called? A. An A scan B. A B scan C. A C scan D. A time line display
A. An A scan
Which display presents information in terms of time of flight and amplitude? A. An A scan B. A B scan C. A C scan D. All the above
A. An A scan
A\_\_\_\_\_\_ produces a two dimensional view of the cross sectional plane through the test object A. Bscan B. Laminar scan C. Cscan D. Roto scan
A. B scan
Reflector shaoe and position are more easily determind by use of the \_\_\_ scan technique A B C D
C
The B scan provides real time visulization of the material as its tested True or false.
True
An ultrasonic instrument control which allows moving an Ascan display to thr left or right without changing the distance between any displayed indications is called A. Damping control B. The range control C. The pulse length control D. The delay or zero offset control
The delay or zero offset control
An ultrasonic instrument control which is used to expand or contract the horizontal baseline of an a scan display is called A. The range control B. The damping control C. The delay or zero offset control D. The pulse length control
A. The range control
The purpose of retrification comtrol on an Ut instrument is to?
A. Eliminate unwanted low level signals
B. Adjust the waveform display
C. Compensate for sound transmission delays
D. All the above
B. Adjust the waveform display
The instrument gain control adjust the
A. Frequency of the search unit
B. Electrical conductivity of the material
C. Electromagnetic properties of the material
D. Amplification applied to the recieved signal
D. Amplification applied to the recieved signal.
The gain control is the controller of the A. Amplifier circut B. Pulser circuit C. Clock circuit D. None of the above
A. Amplifier circuit
When adding 6 db of gain to the test system, the signal height will increase\_\_\_ times its original height A. Two B. Sixty C. Four D. Six
A. Two
The gain control has no influence over outbound pulses, but has everything to do with signals returning from the test material
True or False
True
The range control adjust the dispalys of signals from within a test block to represent the characteristic velocity of the sound beam within the material
True or False
True
Modern control panels typically have fewer knobs and more push buttons to use for setting the instrument functions
True or False
True
The purpose of the reject control is to eliminate unwanted low level A scan levels
True
The reject control is particularly useful in the testing of typically coarse grained castings. This control works on the amplifier circuit
True ir false
True
The zero offset control compensates for sound transmission delays associated with the transducer cable and couplant
True or False
True
The velocity control adjust the instrument settings to match the speed of sound in the test object
True or false
True
The daamping control is designed to help the technician optimize waveform shape for a given transducer
True or false
True
A pulse length control sometimes called (damping control) \_\_\_\_\_\_\_\_ the time that the voltage is applied to the transducer A. Reduces B. Increases C. Both a an b D none of these
C. Both a & b
The frequency control allows
A. The changing of probe frequency
B. The recognition of the probe that has been attached to the coaxial cable
C. The selection of a frequency setting that produces the desired screen presentation for the particular transducer chosen for the test
D. None of the above
C
The three controls are needed to precisely position the gates
A. Gate start, width and alarm level
B. Gate delay, length and sensitivity
C. Various manafactuers assign a variety of names to the gate controls
D. All the above
D all the above
Controls the amplification of recieved signal before display
Gain
Increases or decreases the amount of distance or time presented on the display
Range
Generates the initial pulse recieves the signal from the transducer and forwards to the display
Reciever/amplifier
Adjust the instrument settings to match the speed of sound in the test object.
Velocity
Set this setting to match the selected transducer and produce the desired screen presentation
Frequency
Defines a signal amplitude threshhold when reached and action is trigered
Gates
Controls how display is rendered, can be unrectified rectfied & half rectified
Video mode
Controls changes the location of the whole scan relative to the starting position on the display
Offset
Adjust transducer performance for resolution versus penetrating power
Damping
Eliminate unwanted low level a scan signals. It is particularly in testing coarse grained casting
Reject
