KYORITSU 3316 - Manual (Page 17)

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Output Voltage(V)
Output Voltage(V)
range
range
range
range
range
range
range
range
lnsulation Reslstance(MΩ)
lnsulation Reslstance(MΩ)
Nominal voltage
0.05
MΩ
50V
0.125
MΩ
125V
0.25
MΩ
250V
0.5
MΩ
500V
1MΩ
1000V
Lower limit of insulation
resistance to supply
nominal current ( 1mA )
6 −4 Output voltage characteristics
This instrument conforms to IEC61557. This standard defines
that the nominal current shall be at least 1mA, and the lower
limit of the insulation resistance maintaining the nominal voltage
at the measurement terminal. (See the graph below.)
This value is calculated by dividing the nominal voltage by
nominal current. i.e., in case that the nominal voltage is 500V,
the lower limit of the insulation resistance is found as follows.
Divide 500V by 1mA equals 0.5MΩ
That is, insulation resistance of 0.5MΩ or more is required to
provide the nominal voltage to the instrument.