Briggs & Stratton 252700 Especificaciones descargar pdf (Pagina 7)

CONNECTS TO

NEGATIVE BATTERY

CABLE

FOR BLACK LEAD

FROM METER

RESISTANCE

SECTION

FOR RED LEAD

FROM METER

CONNECTS TO

NEGATIVE BATTERY

POST

Previous Style

Current Style

Note: Meter and battery connections to shunt are the same as the previous DC shunt as shown above.

OHM'S LAW FORMULA

Some background information may help to make this clearer. Ohm’s Law states that 1 volt of electrical pressure

is required to move 1 amp of current (electron ow) through 1 ohm of resistance. Expressed mathematically,

E=IxR or volts equals amps multiplied by resistance.

1 volt = 1 amp x 1 ohm

The DC shunt is designed to have a predetermined resistance of 0.001 ohm between the meter connection

posts. When we use the shunt to check the alternator charge rate, amps is the unknown. Changing Ohm’s

Law around to determine the current gives us:

1 volt

1 amp = ---------

1 ohm

Let’s take a look at units of measure. The prex “milli” is Latin for 1/1000 of a unit. For example, 0.001 inch

could be called a milliinch. Therefore, 1/1000 of an amp equals 0.001 amp or one milliamp. Also, one millivolt

is 1/1000th of a volt or 0.001 volt. Applying these units of measurement for Briggs & Stratton shunt into Ohm’s

Law gives us:

1 millivolt 0.001 volt

1 amp = ----------------- = -----------------

1 milliohm 0.001 ohm

The above equation shows that across the posts on the Briggs & Stratton shunt, 1 milliohm equals 1 amp of

current owing in the circuit. This is why the test meter is set to the millivolt range.

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Briggs & Stratton 252700 Especificaciones Pagina 7