If we were to choose a DVOM, we
could read the average of both the control-
side voltages (supply and ground)
and both of the load-side voltages (supply
and feed) on each leg of the relay
and we could read the average amperage
flowing through each side of the
relay if we plug in a current probe.
Notice I said the average of those
readings ; that is important to remember. We also can perform
voltage drop tests on
aU four circuits one at
a time. If instead, we
chose to use a scope
on that radiator fan
circuit, we could do
aU of the same tests.
Naturally, the time it
would take to perform
those tests, whether
we used a DVOM or a
DSO, would depend on many
factors but would be fairly equal.