Sound velocity adjustment and probe selection of ultrasonic thickness gauge
1. Sound speed adjustment: If the sound speed of the ultrasonic thickness gauge changes, the measured value will change. For example, when adjusting the sound speed, press the "ENTER" key to quickly adjust the sound speed to 5900M/S. Select "Sound Speed" or "Sound Speed Adjustment" in the menu, press and hold the "CAL" or "Calibration" key for about two seconds, the sound speed will be quickly adjusted to 5900M/S, and then press the "ENTER" or "Confirm" key to return to measurement status. If there is still an error in the measurement, the LCD of the standard test block on the measuring instrument should display "4.0" or "4.00mm". If it is a number, press and hold the "CAL" or "Calibration" key for about 2 seconds while measuring the test block. , until the number becomes "4.0" or "4.00mm", that is, the calibration of the instrument is completed and the measurement can be carried out accurately.
2. Probe selection: Ultrasonic thickness gauge probes are mainly classified according to performance and diameter into 7MHz/φ6mm probe, 5MHz/φ10mm probe, 2.5MHz/φ14mm probe, and 5MHz/φ8mm. Before using a certain probe, you should first select the corresponding probe on the instrument. Press the "ENTER" or "Confirm" key to save. The next time you turn on the computer, the probe will be the probe selected this time. To ensure instrument accuracy and stability, it is recommended not to interchange probes. After using the instrument, the couplant and dirt on the probe and instrument should be wiped off.
Thickness gauge calibration tips
1. Use a ladder test block to calibrate when the thickness is close to the maximum value and minimum value of the thickness to be measured (or 1/2 of the maximum value of the thickness to be measured);
2. Place the probe on a thicker test block and adjust the "Sound Velocity Correction" knob so that the thickness gauge displays a reading close to the known value;
3. Place the probe on a thin test block and adjust the "zero correction" knob to make the thickness gauge display reading close to the known value;
4. Adjust repeatedly to obtain correct readings at both the high and low ends of the measuring range, and the instrument is now debugged;
5. If the sound speed of the material is known, the sound speed value can be adjusted in advance, and then on the test block attached to the instrument, adjust the "zero calibration" knob so that the instrument displays the thickness of the test block, and the instrument is debugged.
