The following is a systematic solution for common faults in concrete dynamic modulus testers, compiled based on equipment principles and practical experience:

1、 Power and display system malfunction

-Fault phenomenon 1: The whole machine has no response

-Possible reasons: The power supply is not connected or the fuse is blown.

-Solution steps: Check if the AC220V ± 10% power connection is normal; Replace the fuse.

-Fault phenomenon 2: garbled or black screen on the display screen

-Possible reasons: Program crash or loose screen cable.

-Solution steps: Restart the device; Check the internal integrated circuit board interface.

2、 Mechanical structure and clamping system malfunction

-Fault phenomenon 1: The specimen clamping slips or deforms abnormally, and the data is abnormal

-Possible reasons: Insufficient blade pressure or incorrect positioning of the locating sleeve.

-Calibration method: Adjust the position of the right connecting plate and positioning sleeve according to the size of the specimen.

-Fault phenomenon 2: The pointer of the dial gauge is stuck or returns to zero deviation

-Possible reasons: contamination of the gauge probe or mechanical wear.

-Repair plan: Remove the scale and soak it in alcohol for ultrasonic cleaning; Lightly tap the pointer to reset.

3、 Sensor and signal transmission failure

-Fault phenomenon 1: The resonant frequency cannot be locked

-Possible reasons: Poor contact of the probe or misalignment of the specimen.

-Optimization measures: The transmitting probe is pressed against the center of the side of the specimen, and the receiving probe is placed 5mm away from the edge on the same side; Manually adjust the frequency to the maximum amplitude of the oscilloscope Lissajous as shown in the figure.

-Fault phenomenon 2: Data jumping or poor repeatability

-Possible reasons: Environmental vibration interference or poor grounding.

-Suppression method: Place the instrument on the airbag isolation platform; Short circuit the device casing to the ground.

4、 Software and data processing failures

-Fault phenomenon 1: Missing or formatted print results

-Possible reasons: Printer command conflicts or driver compatibility issues.

-Exclusion strategy: Close and restart the printer; Reset the initialization parameters of the microcontroller DA converter.

-Fault phenomenon 2: The calculated value of elastic modulus deviates from the theoretical range

-Possible reasons: Incorrect selection of constitutive model or calibration failure.

-Correction process: re-enter the dimensions (width x length) and weight parameters of the specimen; Call the freeze-thaw damage correction algorithm.

5、 Environmental adaptability failure

-Fault phenomenon 1: Component short circuit in high humidity environment

-Protection suggestion: Control the laboratory humidity to<90% RH and install a dehumidifier.

-Fault phenomenon 2: Zero offset caused by temperature drift

-Compensation method: Preheat the equipment for 30 minutes to keep the internal temperature constant; Enable the software temperature compensation module.