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Vector The Black And White Monitor Faq And Guide

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    							Black & White Vector Monitor Guide  
    Page 51 of 51  
    TESTING TRANSISTORS WITH A DIGITAL MULTI-METER 
     
    Set your meter to the diode test. Connect the red meter lead to the base of the transistor. Connect 
    the black meter lead to the emitter. A good NPN transistor will read a JUNCTION DROP voltage 
    of between 0.45v and 0.9v. A good PNP transistor will read OPEN. Leave the red meter lead on the 
    base and move the black lead to the collector. The reading should be the same as the previous test. 
    Reverse the meter leads in your hands and repeat the test. This time, connect the black meter lead 
    to the base of the transistor. Connect the red meter lead to the emitter. A good PNP transistor will 
    read a JUNCTION DROP voltage of between 0.45v and 0.9v. A good NPN transistor will read 
    OPEN. Leave the black meter lead on the base and move the red lead to the collector. The reading 
    should be the same as the previous test. Place one meter lead on the collector, the other on the 
    emitter. The meter should read OPEN. Reverse your meter leads. The meter should read OPEN. 
    This is the same for both NPN and PNP transistors. Thanks to Randy Fromm 
     for this excellent summary of the diode test method. 
     
    END  
    						
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