BS EN ISO 5577:2017 pdf download – Non-destructive testing Ultrasonic testing – Vocabulary (ISO 5577:2017) 5.1.2 transmitter electrical device which generates the pulses ( 5. 1. 3) 5.1.3 transmitter pulse electrica l pu l se generated by the instrument (5. 1. 1) for exciting the transducer (4. 1. 1) 5.1.4 recelver electrical device which amplifies or converts signals coming from the ultrasonic probe into usable signals 5.1.5 amplifier electronic device which converts a sma11 signal to a larger si gnal Note 1 to entry: This can be a linear amplifier using a linear law or a logarithmic amplifier using a logarithmic law. 5.1.6 attenuator electronic device which reduces the amplitude (3.2.2) or power of a signal without distortion 5.1 .7 gam level of amplification of signals Note 1 to entry : Usua ll y expressed in decibels (dB). 5.1.8 gain control instrument contro l with which a si gnal may be adjusted to a given height 5.1.9 dynamic range ratio of the amplitudes of the l argest and sma ll est signa l which an instrument (5.1.1) can display without distortion Note 1 to entry: Dynamic range is usually expressed in decibels (dB) . 5.1.10 linearity of amplitude verticaI linearity proportionality of the amplitude of signaIs on the vertical scale of the ultrasonic instrument’s display 5.1.11 suppress lO n reduction of no i se indications by eliminating a11 below a predetermined amplitude level (threshold value) 5.1.12 time-corrected gain TCG dista nce- amplitu de co mp en sat ion function of a device which changes the amplification of echoes from reflectors of equaI size , but different distances and results in equa l height of the echoes on the display Note 1 to entry: This term shall not be confused with distance-amplitude curve (DAC) 5). Note 2 to entry: This definition of time-corrected gain differs from the definition ofthe same term given by 6.8.16 5.1.13 analogue-to-digital converter device which converts analogue signals into discrete numbers representing the pattern ofthe signal 5.1.14 digitization error inaccuracy introduced as a result of analogue-to-digital conversion 5.1.15 time base abscissa of an A-scan calibrated in time or distance Note 1 to entry: 5.1.16 time base control instrument control wh i ch is used to adjust the time to a required range 5.1.17 time base range maximum ultrasonic path length that is displayed on a particu l ar time base 5.1.18 delayed time base sweep time base...
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