Checking The Nonlinearity Of Vertical Scanning - NOVOTEST UD3701 Operation Manual

Operation manual
Ultrasonic Flaw Detector NOVOTEST UD3701
Set generator AFG320 controls in the following positions:
 function FUNC – SINE;
 frequency FREQUENCY – 2,5 MHz;
 amplitude AMPL – 2 V;
 offset OFFSET – 0 V;
 mode MODE – CONT;
 modulation MODULE – OFF;
 phase angle PHASE – 0°;
 channel 1 CH 1 – ON.
2. Set flaw detector parameters in the following way:
 velocity of UT propagation 6063 m/s («VEL – 6063 m/s»);
 measurement range 100 mm («RANGE – 100 mm»);
 probe frequency 2,5 MHz («FREQ – 2,5 MHz»);
 level of excitation generator – U1 («Energy – U1»);
 level of the gate – 50 % (parameter group «Gates» - parameter «Level – 50%»);
 method of echo-signal measurement – by peak («MEAS – PEAK»);
 averaging of signals – 4 (parameter group «Func» - parameter «AVG – 4»);
 probe type – dual element («DUAL – ON»).
3. Set in device parameter gain equal to 30 dB, set attenuation of tester attenuator - 1 dB.
4. Make the standard level (50% of the device screen) for displaying signal by keys of gain
control of generator AFG320.
5. Overlay the gate on the signal. Make the exact position of the signal on standard level
(50% of the device screen).
6. Increase gain of flaw detector on 10 dB with parallel increasing of attenuation of test
attenuator, that required to return signal to standard level (50% of the device screen)
Record determined value of increasing of attenuation of test attenuator N
7. Calculate accuracy:
8. Repeat p.7 until gain 90 dB.
9. Algebraic sum of measurement accuracy ΔN should not exceed 2 dB.
10. Repeat p.4-10 for frequencies: 1,2; 1,8; 5,0; 10 MHz.

3.2.6 Checking the nonlinearity of vertical scanning

1. Make a connection diagram shown in Figure 3.2 (p. 3.3.6).
2. Set generator AFG320 controls in the following positions:
 function FUNC – SINE;
 frequency FREQUENCY – 2,5 MHz;
 amplitude AMPL – 2 V;
 offset OFFSET – 0 V;
 mode MODE – CONT;
 modulation MODULE – OFF;
 phase angle PHASE – 0°;
 channel 1 CH 1 – ON.
3. Set flaw detector parameters in the following way:
 velocity of UT propagation 6063 m/s («VEL – 6063 m/s»);
 measurement range 100 mm («RANGE – 100 mm»);
 probe frequency 2,5 MHz («FREQ – 2,5 MHz»);
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ΔN = 10 dB – N
att.
att.
(3.1)