Megger DET4TR2 - Page 41

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Figure 22: P stake resistance OK (green region)
Figure 23: P stake resistance not OK (red region)
8. If the P stake resistance is acceptable (needle in the green region of the scaleplate), release the
Rp button.
9. Press and hold the TEST button.
10. The Rc LED will flash to indicate that the instrument is carrying out pre-measurement checks.
11. If the Rc LED does not illuminate following the pre-measurement checks, this indicates that the C
stake resistance exceeds the limits for an accurate measurement or that the instrument fuse has
ruptured.
12. If the Rc LED illuminates solidly following the pre-measurement checks, this indicates that a
three-terminal measurement can be made.
13. The three-terminal resistance reading will be indicated on the scaleplate as shown in Figure 24.