YANTEK YD308, Руководство пользователя

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If the green LED went off at that instant or if the circuit breaker
tripped, the tool has been overloaded. This could happen for the
following reasons:
If the circuit breaker is tripped, reset it by waiting for it to cool
down (15 sec.)
If the circuit breaker tripped, that contact is likely a ground. Reset
the circuit breaker by letting it cool down for 15 seconds.
The contact you are probing is a direct ground or negative voltage.
The component you are testing is short-circuited.
The component is a very high current component (i.e., starter motor).
While the tool in DC Voltage mode, clip the auxiliary ground lead
to the trailer ground, probe the contacts at the jack and then apply
voltage to the probe tip. This lets you check the function and
orientation of the connector and trailer lights. (Figure 13)
3.5 Testing Trailer Lights and Connections
While the tool in DC Voltage mode, contact the probe tip to the
positive terminal of the component, the green LED should light,
indicating continuity to ground. While observing the green LED,
3.6 Activating Components in The Vehicle
Figure 13