Testing Electrical Continuity - Veris 3150 MSP3 Operating Instructions Manual

Procedure #3: Testing Electrical Continuity
Perform this test daily or every 10 hours of data collection to ensure you are obtaining reliable
data, and whenever EC data is questionable.
The purpose of this test is to insure that each coulter-electrode has an uninterrupted signal path
from the VSense controller to the disk blade. Think of each coulter-electrode and its wire path as a
'channel'. On a MSP3, there are 6 signal channels that must be clear and isolated from one
another. On the MSP-3D there are 8 channels. You will first test the complete pathway for each
channel—each coulter-electrode. One easy-to-take reading for each channel tests the cable,
wiring harness, and each coulter-electrode and disk blade. If no problems surface during this test,
there is no need to test individual components. This test should take only a couple of minutes to
perform.
To perform this test, you will need the EC Signal Test Box (part # 223707) and an ohmmeter
(sometimes referred to as a multi-meter or voltmeter). Make sure the meter is set to ohms, Ω. If a
range of ohms is available, choose the lowest setting--ohms rather than kilo or mega ohms. If
unfamiliar with 'ohming-out' or resistance testing, make a few trial tests before performing the Veris
signal test procedure. Touching the meter leads together will display a zero resistance reading,
touching two places on the same piece of metal will produce a nearly zero reading, touching
nothing will produce an OL (overload or over limit) reading—meaning complete resistance, and no
continuity.
Figure 3.1
Remove the signal cable from the VSense Controller and connect it to the terminal on the test box.
This cable attaches to the signal cable end and allows you
to position the Signal Test Box in close proximity to the
coulter-electrodes.
6-4
Pub. # OM20-MSP3-3D