Megger DET4 Series User Manual

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Figure 34: example three-terminal resistance reading with lead-null using ART (DET4
display shown)
8. Under certain circumstances, the instrument may display a noise warning as shown:
This means that interference has been detected which may impair the accuracy of the measurement. In
particular, the reading could be lower than the actual resistance. The resistance of the electrode or system
must be verified by an alternative method.
Note:
 The instrument will display the warning triangle and an excessive noise voltage indicator if the ground
noise voltage is above 40 V pk-pk (14 Vrms).
 The instrument will display the warning triangle and a voltage over-range condition if the ground
noise voltage is above 100 V – no resistance reading is possible under this condition.
 The instrument will display the warning triangle above 2 A – no ART testing is possible under this
condition.
 The instrument will display the warning triangle and an over-range condition above 20 A – no ART
testing is possible under this condition.
 Ensure that the ICLAMP jaw mating surfaces are free of dust and contamination and that they contact
completely when the ICLAMP is closed.
 Currents carried by conductors in close proximity to the ICLAMP may affect calibration and reduce the
accuracy of measurements made.

Megger DET4 Series Specifications

General

Brand	Megger
Model	DET4 Series
Category	Test Equipment
Language	English