Ammeters And Specialized Charging System Testers - Cub Cadet RZT-S Professional Shop Manual

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Ammeters and specialized charging system testers

DMM with inductive
ammeter feature
Inductive ammeter
Figure 7.34
DMM on
300Mv
scale
Figure 7.35
To negative
battery post
calibrated
resistance:
creates
amperage
reading
Connect to
battery end of
ground cable
www.mymowerparts.com
Inductive ammeters are available in many forms. Some
are as simple as a gauge to be held against the circuit in
question when it is energized. The operating principle is
based on magnetic field induced by the current flow.
See Figure 7.34.
There are two primary reasons to measure amperage.
The first is to check the output of a charging system or bat-
tery. The second is to check the performance of a compo-
nent that draws a substantial flow of power, typically a
motor or clutch.
Briggs and Stratton sells a DC Shunt that converts
amperage into a reading on the millivolt scale of a DMM.
Briggs and Stratton part # 19359 covers low amperage
systems, while part # 19468 tests higher amperage sys-
tems. The operating principle is based on Ohm's Law, as
described earlier in this section. See Figure 7.35.
• Usage of the DC Shunt tool is detailed in the 1995
and 1999 editions of their Update Seminar materi-
als.
Electrical System
87