(7) Output voltage characteristics
This instrument conforms to IEC61557-2. This standard specifies that the
rated current shall be at least 1 mA and thus defines the lower limit of the
insulation resistance to maintain the rated voltage at the measurement
terminal. (See the graph below.)
This value is calculated by dividing the rated voltage by rated current.
ie., in case that the rated voltage is 500 V, the lower limit of the insulation
resistance is found as follows.
Divide 500 V by 1mA equals 0.5 MΩ.
That is, insulation resistance of 0.5 MΩ or more is required to provide the
rated voltage to the instrument.
Rated voltage 250 V 500 V 1000 V
Lower limit of insulation resistance to
supply rated measurement current (1 mA)
0.25 MΩ 0.5 MΩ 1 MΩ
Fig. 8-6
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