EXPERMENT NO. 6 Meter check of transistor

Meter Check of Transistor

In this experment i'd explain how can check the Bipolar Junction Transistor (BJT).
BJT transistor three layer semiconductor two type PNP or NPN these like two diodes connected back to back. When we testing with a multimeter with diode function. How can identify PNP or NPN? Low voltge reading meter with the negative (-) leads that is the N type transistor which is PNP transistor .
low voltagereading with positve(+) lead on base wich opposite of NPN.

The thyory of BJT
Transisor are current controled soled state divices, that cunduct current in proportin to an inpt current .
The symbol of BJT PNP & NPN transsitors are bellow;

For the NPN transistor, current flowing into into base (B) of transistor the resullt in proportionally a large current to flowing between collector (C) & emitter (E).
The curent flowing out of base PNP transistor alows propoortional current to flow between the (E) & (C).

BJT terminal identified by meter.

I have got two BjT NPN &PNP for identifing legs of transistor used my multi meter on diode function, and folow instruction my work book page 18 .
The meter reading recoord in below chart, also the pictures you can see reading.

Diode test with meter reading.

Transistor Number	V BE	V EB	V BC	VCB	V CE	V EC
NPN (C547)	0.711 v	0.716v	0.715 v	OL	OL	OL
PNP (C557)	OL	OL	0.712 v	0.718	OL	OL

                  testing NPN (BJT) (C547) V EB =0.16v forward

              Testing BJT NPN , V CB reading OL

                      testing , BJT, NPN, V CE OL

                            testing BJT, NPN, VBE 0.711

                        Testing BJT ,PNP VBC 0.712

             testing BJT (C547), NPN, VCE (OL) 

        TEsting BJT(C547) NPN, Veb 0.16

                 Testing BJT (C557) Vbe OL

                    Testing BJT (C547) NPN , Vbc 0.17

                             Testing BJT (C557) PNP Veb OL


In this i have find wich terminal of risistor are collector, base and emitter.
the first thiing i notesed meter reading only between two terminl of ristor . The reading between emitter to base in my reading 0.7V that should in forward biase, which is NPN (BJT). Also collector to base in PNP 0.71v i had recorded .These reading also idintify me wich is PNP or NPN because , current flowing from emitter to base on PNP current can not flkowing  from base or collector to emitter, and in NPN current flowing from base to emitter, also we can say in forward biase.