Veris Technologies Quad 1000 Soil EC Mapping System - Operating Instructions - Manual (Page 26)

OM17-Quad1000
6-5
Disk Electrode Functions-
Each disk electrode on the implement is part of a pair, and each pair has a distinct function.
a)
Disks 1 & 4 are the “charged” disks that inject the voltage into the soil.
b) Disks 2 & 3 are the “Shallow EC” receptors.
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 disk-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 disk
wire connector bolt. Repeat process on all disk-electrodes. If there is a broken wire inside
the insulation, it may be difficult to detect without flexing the wires during this test.
Figure 3.2a and 3.2b Testing cable at disk electrode #2
2. If you see <2 ohms on all, test the disk electrodes as explained in B below.
3. If you see a > 2ohms reading on any channel, you will need to determine whether problem
is in extension cable (cable from implement to EC Surveyor) or in the wiring harness (cables
attached to implement. Visually inspect the wiring harness and cable extension for damage.
If a vi
sual inspection doesn’t reveal a problem, you will need to test continuity of the wiring
harness and cable by ohming these cables out individually. Disconnect signal extension
cable from implement and insert ohmmeter leads into sockets as shown below.
Connect one lead to test
box terminal and other
lead to corresponding
disk wire connector bolt