the P stake resistance is within limits for an accurate measurement and into the red region (Figure 23) if the P stake
resistance exceeds the limits for an accurate measurement.
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.
Figure 24: example three-terminal resistance reading
Note
:
No resistance reading is possible if the ground noise voltage exceeds 100 V.
