Voltage Characteristics Of Measurement Terminals - KYORITSU KEW3552 Instruction Manual

1.888.610.7664

8-3 Voltage characteristics of measurement terminals

This instrument conforms to IEC61557. This standard defines that the rated
measurement current shall be at least 1 mA, and the lower limit of the
insulation resistance maintaining the rated measurement voltage at
measurement terminals. (See the table 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 1 mA 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 50V 100V
Lower limit of the
insulation resistance
0.05 MΩ 0.1 MΩ 0.125 MΩ 0.25 MΩ 0.5 MΩ
to provide the rated
current of 1 mA
Insutation resistance (MΩ)
Insutation resistance (MΩ)
̶ 24 ̶
www.calcert.com
15
10 20
5 25
0 30
125V 250V 500V 1000V
1 MΩ
Range
Range
Fig. 8-6
Range
Range
Range
Range
Fig. 8-7
sales@calcert.com