Veris Technologies Quad 2800 Soil EC Mapping System - Operating Instructions - Manual (Page 28)

OM17-Quad2800
6-6
Figure 3.3. Check continuity of signal harness, with one ohmmeter lead contacting pin in
connector and other lead contacting corresponding disk-electrode.
If that test shows < ohms of resistance, test signal extension cable as shown in Figure 3.4
Figure 3.4. Check continuity of signal extension cable with one ohmmeter lead contacting pins
in extension cable end making sure to only touch one pin at a time, and the other lead
contacting corresponding test box terminal.
Note: intermittent electrical problems are difficult to diagnose. Flex wiring and connectors while
checking continuity.
B. Testing Disk-Electrode continuity
1. Place ohmmeter lead on terminal wire bolt and other lead on disk blade. Rotate blade ¼
turn. If readings are consistently above 2 ohms, check for excessive corrosion at the disk
blade mounting bolts, or the terminal located near the disk pivot. Make sure that high ohm
readings are not due to poor contact between blade and ohmmeter lead. Re-test holding
lead firmly against edge of blade, removing rust or paint if necessary.