Veris Technologies OpticMapper - Operating Instructions - Manual (Page 39)

Pub.# OM17-OpticMapper
6-5
Coulter Electrode Functions-
Each coulter electrode on the implement is part of a pair, and each pair has a distinct function.
a)
Coulters 1 & 6 are the Deep EC receptors. If you are seeing problems only with the “Deep”
readings, focus on testing continuity on these two coulter-electrodes.
b)
Coulters 2 & 5 are the “charged” coulters that inject the voltage into the soil. If you are
getting no (or intermittent) readings on both the “Shallow” and the “Deep” -- continuity to
one of these two coulter-electrodes is likely the cause.
c) Coulters 3 & 4 are the “Shallow EC” receptors. Focus on this pair if you see problems in the
“Shallow” reading.
If the continuity ohm test indicates a problem on a channel, you will need to determine where the
interruption is located. Listed below are detailed instructions on how to determine exactly where a
continuity or isolation problem is located:
A. Testing Cable and Wiring continuity:
1. Once a high resistance reading on a channel is confirmed, determine whether the problem
is in the wiring or in the coulter-electrode. To test all cable and wiring, place one ohmmeter
lead in the Test Box terminal pin for that channel and the other on the corresponding coulter
wire terminal bolt. Grasp sure-seal connector and move back and forth during this test
–
vibration from rough fields can weaken the contacts on the sure seal, causing breaks in
continuity during operation that might no show up in a static test. Repeat process on all
coulter-electrodes.
Figure 3.2 Testing cable at coulter electrode #3 terminal
2. If you see <2 ohms on all, test the coulter electrodes as explained in B below.
3. If you see a > 2ohms reading on any channel, separate sure-seal connector and insert one
ohmmeter lead in the end of wiring harness and the other lead in the corresponding terminal
on the Test Box. If reading is < 2 ohms at that point, the problem is not with the wiring
harness or signal cable extension. It is most likely in the terminal connector wire. Check
resistance in it by placing one ohmmeter lead on the coulter wire terminal bolt and the other
lead in the end of the terminal wire socket. Replace connector wire (PN 14226) as
necessary.