3.8.2　Experimental instruments

GVZ-3 conductive microcrystalline electrostatic field plotter(including conductive microcrystalline,double-layer fixed holder,synchronous probe,etc.)is shown in Figure 3.8.1.For the double layer fixed holder,the recording paper is fixed on the top layer and the conductive microcrystalline board is assembled on the bottom layer.There are two coaxial probes on the top of the conductive microcrystalline and the recording paper,respectively.The two probes are fixed on the same handle seat through the metal probe arm,and they are always kept on the same plumb line to ensure the same movement track.By moving the synchronous probe,we can find out some points with the same potential on the conducting microcrystal,and then we can draw the equipotential line.

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Figure 3.8.1　Structure diagram of electrostatic field plotter