YANTEK YD308, Руководство пользователя

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While the tool in DC Voltage mode, contact the probe tip to the
negative terminal of the component, the red LED should light. While
observing the red LED, quickly depress and release the power switch
rearward. If the red LED went out and the green LED came on, you
may proceed with further activation. (Figure 15) 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:
WARNING
:
With this function, if you are contacting a protected circuit,
a vehicle’s fuse can be blown or tripped if you apply ground to it.
3.7 Activating Components w/Ground
If the circuit breaker is tripped, reset it by waiting for it to cool
down (15 sec.).
The contact you are probing is a direct positive voltage.
The component you are testing is short-circuited.
The component is a very high current component(i.e., starter motor).
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Figure 15