What kind of instrument can measure instantaneous voltage of piezoelectric ceramic component generated by the piezoelectric igniter?

At first, we tried to measure the DC high-voltage gear of the ordinary pointer type multi-meter. It was found that the voltage of the two electrodes of piezoelectric ceramics can only slightly shake the pointer when the black plastic pressure bar of the ignition element is pressed. The reason for the analysis is that because the voltage pulse duration is very short, the pointer inertia is large, and the pointer cannot synchronously reflect the change of the voltage to make a large deflection. Switching to the digital display type multimeter, in order to have no pointer inertia effect, it should be able to read the instantaneous high voltage. Whoever knows what is going wrong, we can't see the expected high voltage reading, we can only see some variable low voltage. data. In the analysis, this is due to the slow response of the liquid crystal display, the ignition pulse duration is very short, and it is too late to display the highest instantaneous voltage. It can only display some random voltage readings during the voltage drop (smooth phase). Finally, we moved out of the lab's "heavy weapon" - the oscilloscope, and then have a try. We use the most common J2459 student oscilloscope in the lab, and the connecting wires of piezoelectri acoustic transducers were two ordinary wires with a final fish clip. In theory, the oscilloscope uses the electron beam to deflect and slide on the screen to show the movement of the spot. The electron beam has very little inertia and should be able to track the change of the high voltage pulse. The experimental results are not unexpected.

Putting the oscilloscope AC/DC selector switch in the“DC” position, and the scanning range is placed in the “10～100kHz” block. Move the horizontal bright line to the center of the square coordinate with X shift and Y shift, and set it on the X axis. In order to estimate the maximum voltage amplitude of the piezoelectric effect, we must first determine the voltage scale by using the square coordinate system in front of the screen,Pzt ceramic transducers are using two wires connected to the yoke input Y of the oscilloscope and 1.5 of a dry battery.The V voltage is added to the oscilloscope, the attenuation is placed, and the Y gain is placed at the lowest. It can be found that the horizontal jump line (or the next jump) is just two grids, that is, the two grids represent 1.5V. In the case where the Y gain is constant, the Y attenuation is placed in the 1000 (ie, one thousandth)  and the two grids in front of the screen can represent 1500V. Connecting the crocodile clips of the two feeders on the Y input terminal to the two electrodes of the piezoelectric element, and quickly press the black plastic pressure rod to see that the horizontal bright line is at the center height. and then return to the original position. Due to the glow effect of the fluorescent screen, the horizontal bright line appears on the oscilloscope as a bright band with a height of four squares, which indicates that the voltage amplitude of the pulse is above 3000V.