910-269-EN, Rev. B, June 2011
328 Appendix B
Pulse repetition rate
or pulse repetition
frequency (PRF)
The frequency with which the clock circuit sends its
trigger pulses to the sweep generator and the transmitter,
usually quoted in terms of pulses per second (PPS).
Range The distance represented by the entire horizontal data
display.
Receiver That circuit of a flaw detector that receives both the initial
pulse voltage from the transmitter and the returning
echoes (as voltages) from the transducer. By passing these
incoming signals through certain subcircuits, the signals
are rectified, filtered and amplified with the results send to
the screen for display.
Reference echo The echo from a reference-reflector.
Reference level The number of decibels of calibrated gain which must be
set on the instrument to bring the reference-reflector signal
to peak at the reference line on the data display.
Reference line A predetermined horizontal line (usually dictated by
specifications) on the data display representing some
percentage of total data display height, at which reference
echoes and indication echoes are compared.
Reference-reflector A reflector of known size (geometry) at a known distance,
such as a flat-bottom hole.
Refraction, angle of The angle of sound reflection in the wedge which is equal
to the angle of incidence (also in the wedge.) The angle of
reflectance is measured from the normal to the reflected
sound beam.
Registration The minimum detectable flaw size.
Reject (control) Also known as suppression, limits the input sensitivity of
the amplifier in the receiver. “Grass” or scattering noise
can be reduced or eliminated from the data display by its
use. On most analog instruments it also destroys the
vertical linearity relationship between echo heights.
Table 37 Glossary (continued)
Term Definition
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