BS EN ISO 5577:2017 pdf download – Non-destructive testing Ultrasonic testing – Vocabulary (ISO 5577:2017)
electrical device which generates the pulses ( 5. 1. 3)
electrica l pu l se generated by the instrument (5. 1. 1) for exciting the transducer (4. 1. 1)
electrical device which amplifies or converts signals coming from the ultrasonic probe into usable signals
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.
electronic device which reduces the amplitude (3.2.2) or power of a signal without distortion
level of amplification of signals
Note 1 to entry : Usua ll y expressed in decibels (dB).
instrument contro l with which a si gnal may be adjusted to a given height
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) .
linearity of amplitude
proportionality of the amplitude of signaIs on the vertical scale of the ultrasonic instrument’s display
suppress lO n
reduction of no i se indications by eliminating a11 below a predetermined amplitude level (threshold value)
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
device which converts analogue signals into discrete numbers representing the pattern ofthe signal
inaccuracy introduced as a result of analogue-to-digital conversion
abscissa of an A-scan calibrated in time or distance
Note 1 to entry:
time base control
instrument control wh i ch is used to adjust the time to a required range
time base range
maximum ultrasonic path length that is displayed on a particu l ar time base
delayed time base sweep
time base sweep triggered with a given or adjustable , in relation to the pulse (5.1.3) or a
linearity of time base
proportiona lity of the positions of signals on the time base ofthe ultrasonic instrument’s display
component of an ultrasonic instrument which provides a gate within which the presence of echoes above or below a defined level can be indicated
electronic means of selecting a segment of the time for monitoring or further processing of signals
mo nitor level
defined amp litude level ( thre sho ld) above or below which echoes (see signals in a gate are selected for further pr ocessing
which provides a proportional output of any signal that is received during the period of the gate
Note 1 to entry: The output can be voltage or curren t.BS EN ISO 5577 pdf download.