11
4-6a).
Figure 4-6a Microampere Access Test C High Voltage Side Wiring Diagram
The microammeter shall be connected with the test product by special shielded wire.
The shielding leads of the high voltage leads should be closely connected with the
shielding of the microammeter. To eliminate the effect of surface leakage current on the
sample, the bare metal cord can be connected to the shield of the high-voltage lead after
tightly winding several times at the high-potential end of the sample (see figure 4-6b).
Fig. 4-6b wiring diagram of surface effect of C excluded sample
3.Precision measurement of low-voltage side
When the grounding end of the sample such as zinc oxide and magnetic blow
arrester can be separated, an ammeter can also be used at the bottom (ground
potential side) of the sample for measurement (see figure 4-6c). To eliminate the
effect of leakage current on the surface of the sample, multiple thin bare copper wires
