Veris U3 Operating Instructions Manual page 46

2. Inspect nylon insulation slides under coulter-electrode
mounting brackets. These nylon insulators may become
worn or brittle, or may slip out from under mounting
bracket. Repair and replace as necessary. Make sure that
all electrode coulter U-bolts are properly tightened to
clamp mounting bracket and insulation tightly to frame.
3. Disconnect signal cable from instrument or front of frame. Check so see that no metal part of the any
coulter electrode is in contact with the implement frame. This may be by visual inspection or by
connecting one lead of an ohmmeter to the individual coulter electrode, and the other to a grounded
fastener on the frame. If the coulter electrode is properly isolated, no reading will be obtained. Make
sure that all electrode coulter clamp bolts are properly tightened to prevent lateral movement of the
coulter electrode.
Figure 4.9
4. Wet soil on the toolbar could be a pathway for the EC signal to short. Test coulter-to-coulter and
coulter-to-frame isolation by checking resistance between coulter-electrodes. Any continuity from
one coulter to another is not acceptable. Remove buildup of wet soil, especially if is bridges across
insulation slides. It may be necessary to remove coulter mounting brackets and clean toolbar, if
problem persists.
no
continuity
grounded
bolt
coulter
terminal
Figure 4.10 Wet soil buildup on toolbar may cause EC signal
to short.
6-10
Figure 4.8
Pub# OM20-U3-pH