HVTest HT2533, Руководство пользователя

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Note: If left unused for a long period, please remove the
batteries from the compartment to prevent battery leakage damage
the instrument.
3. Instruction of guard terminal
When measuring insulation resistance of power cables or
having external electromagnetic interference, in order to eliminate
the effect of surface leakage current and external electromagnetic
interference to the measurement results accuracy, in actual
measurement process, using guard terminal of the instrument to
eliminate leakage current and shielding interference.
For two or more measured objects such as arresters, coupling
capacitor, please wiring as shown in Figure 5. Connect guard
terminal to a flange of measured arrester, so that the interference
current caused by high voltage lines is shielded by guard terminal,
thus prevent interference on the main current. Connect the top
flange of arrester to earth terminal, then let the instrument earth, so
that interfere current can directly be connected to the earth. But the
latter cannot completely eliminated interference.