Veris Technologies OpticMapper - Operating Instructions - Manual (Page 42)

Pub.# OM17-OpticMapper
6-8
Figure 3.7
C. Testing Coulter-Electrode isolation
If continuity tests show no excessive resistance on any channel, yet erratic soil EC readings
continue, or if EC readings do not drop to
–1 when unit is out of the soil, it is possible that the
channels are not isolated. This could be the result of a pinched wiring cable, causing channels to
short out. Or, one of the coulter-electrodes is no longer insulated properly from the frame or
adjacent coulter-electrodes.
1. If EC readings do not drop to
–1 when unit is raised, disconnect signal cable extension from
implement. If readings don’t drop to –1, the problem is with the signal cable extension. If
readings show -1, re-insert the signal cable extension into the implement. Disconnect the
sure-seal terminal connector wire from each coulter electrode. If
readings don’t drop to –1,
the problem is with the wiring harness. If this is the case, you should replace the wiring
harness. If readings do drop, re-insert the signal cable extension into the implement. The
problem is with one or more of the coulter-electrodes. Proceed as follows:
sure-seal pin
sure seal socket
Figure 3.8
hubcap
commutator
coulter spindle