On Thursday, 5 March 2020 09:34:30 UTC, RobH  wrote:   
   > On 05/03/2020 05:21, Jasen Betts wrote:   
   > > On 2020-03-04, RobH  wrote:   
   > >> I have some BC547 transistors which I want to use in a circuit, but   
   > >> according to this:   
   > >>   
   > >> Hook the positive lead from the multimeter to the to the EMITTER (E) of   
   > >> the transistor. Hook the negative meter lead to the BASE (B) of the   
   > >> transistor. For an good NPN transistor, you should see “OL” (Over   
   > >> Limit). If you are testing PNP transistor, the meter should show a   
   > >> voltage drop between 0.45V and 0.9V. 4 May 2017   
   > >    
   > >> None of the BC547's give the those readings, as I get 0.02V on a few of   
   > >> what I have, and not 0.45V.   
   > >    
   > > You must put your meter in diode-test mode, (on the fluke 77 it looks   
   > > like that's also continuity beeper mode) it should say OL with the leads   
   > > unconnected and 0.00V with them toucheing eaco other. then do the above   
   > > measurements.   
   > >    
   > >> Are mine no good and should I bin them. I have had them for a couple of   
   > >> years or so now, and only used 1 of them.   
   > >    
   > > I'm guessing operator error, they should still be good after only a few   
   > > years.   
   > >    
   >    
   >    
   > Putting the meter in diode-test mode,it reads OL when leads are    
   > unconnected and 0.00v when touching each other.   
   > Then connecting the positive to the Emitter and negative lead to the    
   > Base the meter beeps, then reads 0.666, the same reading when the    
   > positive is connected to the collector.   
      
   that means the tr is dropping 0.666v as each junction conducts. Black lead is   
   +ve on diode test so you have an npn tr behaving normally.   
      
      
   NT   
      
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