Appendix G. Glossary
Impulse Response — Option in the Service Menu that enables you to force the meter to transmit in one direction only, without changing the amplifier gain setting.
Locale — Format for displaying the time and date.
Peak Detection — A method for identifying the ultrasonic signature in the received signal. In the “Peak” method, the peak is identified by testing a derivative of the signal. In the “Threshold” method, the peak is identified as the point where the signal crosses a threshold that is a percentage of the maximum signal detected.
Receive Window — A window of time during which the PT878 tries to detect the ultrasonic signal. It is determined by using the fluid soundspeed and the signal path length to estimate when the signal will arrive at the receiving transducer.
Reynolds Correction — Correction factor based on the Kinematic Viscosity and flow rate of the fluid.
Signal Inversion — Option that enables a thickness gauge user to invert the transducer signal.
Signal Path — Path the ultrasonic signal travels from one transducer to the other.
Simulate — Option in the Service Menu that allows users to simulate measurements based on a waveform stored in the PT878.
Site — A location on a pipe where measurements are made. The site includes the transducers, pipe, fluid type, pipe material and other parameters.
Site File — Instrument program that combines all the necessary parameters (transducer, pipe, fluid, etc.) for a particular measurement location.
Snapshot — Option in the Meter Menu to take screen captures in bitmap format of a given screen display.
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