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METREL MI3115 - Page 76

METREL MI3115
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MI 3115 PV Analyser
Appendix D - PV measurements - calculated values
76
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Equation
symbol
Instrument
abbreviation
Description
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Roc+
Measured resistance between DC+ and PE
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Roc-
Measured resistance between DC+ and PE
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Roc
Calculated resistance
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Uoc_m
Measured PV open-circuit voltage
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Uiso
Measured insulation resistance test voltage
To get accurate results care must be taken, when performing insulation measurements. PV
module or string can have a significant capacitive nature therefore the duration of the
measurement must be long enough, that the result is stable. Therefore, the user has to set
up the duration of the measurement, which can be up to one minute. If the measurement
time is too short and the displayed value is not stable the final result must be treated only as
informational.

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