KYORITSU 3127 - Manual (Page 27)

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When DAR/PI values are displayed as“---”:
DAR and PI values are determined by the methods 1. and 2. as described
above, therefore, they are displayed as “---” when the measured insulation
resistances fall under any of following cases.
①
measured value is “0.0MΩ”
② measured value is “OL”
*“ OL”is displayed when the measured value exceeds the upper limit of the
measuring range at each insulation resistance range.
Range Upper limit
250V 12GΩ
500V 120GΩ
1000V 240GΩ
2500V 1200GΩ
5000V 12TΩ