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Aim
To use a multimeter to see the unidirectional flow of current in case of a diode and an
LED and check whether a given electronic component (e.g. diode) is in working order.
@ scanned with OKEN Scanner Apparatus
A multimeter, a
je and an LED.
Theory
For construction, principle and use of a multimeter for idemtification o
measurements refer to activity no. B-1.
componens ng
(@ A diode or an LED conduets only when forward based; in reverse biasing thee
istg
flow of current.
(0) To ensure whether a diode is in working order, it will allow the cumen to
Fn one
ction, that too when forward biased.
Procedure
Unidirectional Flow of Current
Case of Junction diode :
L
a
Ss.
- Select the dc. current at 10 mA range by lade.”
Connect the +ve marked end of the diode
Blak
to +ve terminal of a 6 V variable dc. propery Sh
batery and ajdt minima ohags Sa |
Fig. 10.3). Reg wv
oe Zk |
Fe
using the selector switch. Insert one of the
metallic ends ofthe red probe in terminal
P (+) and the black metalic end into the 105: Zeng wnrerona caren
terminal marked common.
Connect the other malic end of red probe tothe fee end of the dode and he
metallic end of black probe into the —ve terminal of the battery eliminator and read the
value of the current by varying the output of the eliminator, Since the diode is forward
biased, i allows the current to pass.
Now reverse the terminals of the diode such tat the end marked ve is at bihe
potential and the one marked +ve i at lower pont, Again observe the cure
in multimeter on the appropriated. miliampere scale. No curent readng inte
thultimeter would indiate thatthe diode allows the Row of current in one direction
only Ley the eurrent is unidirectional in a diode.
Now replace the diode by LED and repeat the steps 1 0 4 to establish that an LED
‘also allows the flow of current only when it is forward biased as well as emits light.
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To use a multimeter to (a) identify base of a multimeter (b) distinguish between non and pop type transistors (c) see the unidirectional flow of current in case of a diode and an LED (d) check whether a given electronic component (ex- diode, transistor, or IC) is in working order
