GB/T 39849-2021 Translated English of Chinese Standard (GBT39849-2021): Non-destructive testing instruments -- Ultrasonic time-of-flight diffraction instrument -- Methods of performance testswww.ChineseStandard.net, 30.06.2021 - 21 Seiten This Standard specifies methods of performance tests for the UTOFD instrument. This Standard applies to the UTOFD instrument. |
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according to Formula Adjust appropriate calculated according center frequency fo changing Collection depth connect connection method corresponding cross-talk damping damping during transmission decibels dB delay detection signal device diffraction display display screen document double crystal probe dynamic range equipment equivalent input noise error external standard attenuator fmax frequency band frequency bandwidth full-screen amplitude gain gate given greater Hertz Hz increase input signal input signal amplitude Institute instrument sampling rate interval limit maximum measured UTOFD instrument Measuring instruments noise level Note number of sampling observe oscilloscope to measure output end overflow peak-to-peak voltage period probe working mode pulse repetition frequency record references respectively Response RF signal sampling accuracy sampling points sawtooth screen selected set value sharp pulse shown in Figure signal amplitude sine wave signal square test signal transmitted pulse trigger unit upper-limit frequency UTOFD instrument sampling Vein vertical linearity volts width