Light oscilloscope operating steps - Solutions - Huaqiang Electronic Network

1. Select the vibrator based on the following criteria:

• The operating frequency of the vibrator must be higher than the frequency of the signal you are measuring.
• The current output from the dynamic strain gauge should not exceed the maximum allowable current of the vibrator.
• The maximum amplitude of the measured signal must be less than the maximum linear amplitude of the vibrator.
• The output impedance of the strain gauge should match the impedance of the vibration system for optimal performance.

Once the correct vibrator is selected, it can be connected to the oscilloscope.

2. Perform a wiring check. Ensure all switches are in the off position and verify that all connections are properly made.

3. Turn on the power supply. When the motor starts running, the power indicator light should illuminate, and the voltage reading should be approximately 5V. If this is not the case, adjust the power switch between 200V and 240V, then allow the oscilloscope to warm up for 30 minutes before proceeding.

4. Press the illumination button to activate the high-pressure mercury lamp. Let it burn for about 5 minutes, then open the spot grid and the grating. Observe the small spots formed on the screen. If no spots appear, use the special tool to adjust the angle of the vibrator until the light spot appears on the viewing screen.

5. Check the balance of resistance and capacitance of the dynamic resistance strain gauge, and adjust the external critical resistance of the oscilloscope to an appropriate setting.

6. Based on the primary and secondary frequencies, the size, and direction of the signal being measured, position the light spot accordingly. Once the signal spot is set, secure the vibration mechanism to maintain the spot's position.

7. Estimate the amplitude of the signal on each channel and adjust the attenuation switch or sensitivity settings of the strain gauge so that the recorded signal remains within the recording range.

8. Choose an appropriate paper feed speed and time scale based on the frequency and rate of change of the signal. The higher the signal frequency, the faster the paper feed speed. Some oscilloscopes have a labeled paper speed linkage device, where selecting the paper speed automatically sets the corresponding time scale.

9. Record the calibration strain value for reference during analysis.

10. Press and lock the "motor button." Rotate the motor, and set the "shooting fixed length knob" to the desired recording length. Press and lock the "shoot button" to start recording the waveform. The oscilloscope will stop automatically once the set length is reached.

11. After the recording is complete, tear off the paper and expose it to fluorescent light or general indoor lighting for 5 to 50 seconds to reveal the waveform. Then, wrap the black paper and store it properly. Finally, return all oscilloscope switches to their original positions and turn everything off.