Wednesday, January 18, 2023

Example test of Multifunction tester and How to use M tester TC1

How  to  use  M  tester    TC1    Multifunction   tester  

The   short  necessary  information  before  using   the Multifunction tester  TC1 or  the other multifunction test ( M tester) has the same  function as model TC1.  According to its  specification  the multifunction tester  can test  basic electronic  components  such as resistor  capacitor  inductor and semiconductor device  such as   diode   zener  diode   LED   transistor  mosfet  IGBT   triac  SCR  ect.  It  almost cover the component  on  PCB repairing.  The key feature that it can automatically identify  pin  of  component  and  super  easy  to   use.

Multifunction   tester     đồng hồ vạn năng
                                Multifunction   tester  , rechargeable   version 

Multifunction   tester  đồng hồ vạn năng
                       Multifunction   tester   ,  non-rechargeable   version and   lower  cost

The  first   necessary  information before using , it  need  to  know  that  socket  arrangement  and it name. Put the right terminal  to the right socket function.  Don't put too big  terminal to socket ,in this case please use additional test leads.  Additional test leads its purpose for  testing  big components  and not easy to bend  terminals.   For capacitor testing always   discharge capacitor before testing 

                         Socket arrangement and  terminal  function   for   the  right   terminal  insertion

                       Additional   test   leads    for  testing  big components  and   big   terminals 

Example  testing   of   Multifunction   tester

1.  Zener  Diode test.   Insert a  zener diode to KAA socket  , Kathode terminal  to K socket and Anode terminal to A socket.  If  is  is  a good Zener , display will show component name and the  specification of zener diode  as it   should be.

万用表  Multifunction   tester   TC1  use   đồng hồ vạn năng
                                Zener Diode test  and  insert  area  at  KAA

2.   Two  terminal components   testing.   Such  as  resistor , capacitor  , inductor ,  diode  ect. Insert component   to  any  123 socket.   In case   of   big terminals component  use  addition test leads. The display will show component detail what  it  should be.   The bad component  the display will show in different way.

Multifunction   tester   TC1  use  đồng hồ vạn năng
                                 2    terminal components insert to  1233 socket

万用表  Multifunction   tester   TC1  use

                                  2    terminal components insert to  1233 socket

Multifunction   tester   TC1  use  đồng hồ vạn năng
        Always discharge capacitor before testing , non-discharge capacitor may damage the tester.

Multifunction   tester   TC1   đồng hồ vạn năng
                                  Big  terminal component  use  an   additional  test  leads

3.   Three  terminal  components   testing   such as   transistor  SCR   mosfet  IGBT etc.   Insert the component terminal  to  1233  socket and   press the button.  The tester will show the right component name and its specification as it should be  , including , automatically identify terminal function of  components.

                                3  terminal  components   testing , insert to 1233 socket

Multifunction   tester   TC1  đồng hồ vạn năng
                                3  terminal  components   testing , insert   to 1233 socket

đồng hồ vạn năng

đồng hồ vạn năng
  In case of  damage part display , try new socket area and  also try a  new component and compare testing   result.

Tuesday, November 30, 2021

Test integrated circuit HOW TO TEST ICs CHIPS by Multimeter

HOW   TO  TEST   ICs    CHIPS     by     Multimeter  

BASIC    ICs    TESTING  ,  test integrated circuit

electronic  components  testing
How  to   test  integrated   circuit    by  Multimeter

ICs   is  a    circuit and  there are  many small  electronic components  inside it.   ICs has many type , style ,  including its complexity.    On   this article  I will refer to standard  ICs   that  we always find it   at common circuit and I will use standard ICs  for example testing.    For special purpose ICs you can check  with  ICs  maker  how to check and test  it  ,  test guide and specification data can  get these from datasheet ;   type ICs part number on google  search  by   this  you will find datasheet as PDF file.  On datasheet  will  present electrical characteristic  , test graph for designer  and  checking , pin  arrangement  function , sizing  for installation   and   safety  advice.

They    are   2  basic method  to check   ICs.
1)  On circuit  testing .    If  you have oscilloscope  and know  how  circuit is working   such as input , output ,condition  to  on  and off , type of  signal  ; then you can consider it  as block diagram  and section to test.
At the ICs you will check  input  voltage  is present  or  not , output occur  after the input switch on/off or not.     Including   Vcc  of  ICs  should be value  as   its rated voltage.

2.    VCC   and   ground   terminal   resistance   checking.    As    inside  the  ICs  there is  some circuit  , it need voltage to supply and the circuit inside must not  " short circuit "  and  " open circuit"  these is the basic condition for good ICs , we will apply this to check ICs   and   describe below.

Take  ICs part number  that   marked on its body to find  pinning function  on datasheet ,  find  where  is VCC and ground pin  locate. Some ICs has many VCC and ground pin ,   you  to check  all  VCC  pinning  and  it  must be good condition for all VCC.     I will use ICs part number HD74LS00P  for example testing.   Set  multimeter  to resistor  test function then   connect   as  shown  on   photo , measure ,   and  read  resistance value.

HD74LS00P  pining arrangement   ( different  ICs  part number  has different VCC pin  allocation )
The notch  and circle on ICs   mean  pin no.  1  start  from that point.

Pin no.  1  start   at  the dot and notch.

VCC and GND testing , The  first  measurement   and   test   leads    connection.

electronic  components  testing
The    first   measured  resistance value is  high ( for good ICs)

VCC and GND testing , the  second  measurement  and  test leads   connection.

The  second  measured resistance value  is  lower  compare to  the first. ( for good ICs)

Good  ICs .... measured  resistance value of  VCC and ground  testing ,  the first measurement  and  second measurement  , the first testing resistance value  is high and the second is low ( compare to the first ).  See  above  photo for   example.

Bad  ICs (leak)........both measured resistance  value   tend to the same value and very  high  resistance.

Bad  ICs (Short circuit) ....both  measured resistance value tend  to  very low resistance ( almost be  0  ohm )

Bad  ICs ( open  circuit) ... the display show  " OL"   for both    measurement.

How to check electronic device

Choose   topics   to   read.

HOW TO TEST ICs Chips VOLTAGE REGULATOR 78XX 79XX series 7805 7815 7815 test integrated circuit


IC   VOLTAGE    REGULATOR    TESTING   /   test  integrated   circuit  

test  integrated   circuit    TEST   VOLTAGE  REGULATOR

IC  Voltage  Regulator  part number  78XX  79XX series  are  popular ICs that  use  on  many power supply circuit.   Regulate voltage function  is  necessary  for every  electronic circuits so we always find these ICs   on  many circuits  ,  The  ICs  is  small and has  many package to choose.    The basic  package is  TO-220 and  TO-3  as  shown on   photo below.   78XX series is  for positive output   for part number  example   7805 =  5VDC    ,  7812 = 12VDC  ,  7815 =  15VDC etc.   79XX series is  for  negative  output  for  part number  example 7 905 = - 5VDC    ,  7912 =  -12VDC  ,  7915 =  -15VDC etc.   The part number has  L  at  the middle like 78L05  , 78L12 , 78L15 means  it  has  output  current    around 100mA   and  part number  has T at end  like  7805T , 7812T , 7815T

HOW TO TEST OPTOCOUPLER ICs CHIPS test integrated circuit


Optocoupler  is one   type of  ICs , It   isolates input  and output section  by using  optical technology  this  feature  increase safety of  circuit.  Optocoupler  has many   part number , different  part number has different output type so before checking it   has to  use part number to  research with datasheet and find input type and output type.   How to check  Optocoupler it depends  on  device type inside the ICs.   There   are  many package of  Optocoupler , briefly ,  through hole and  SMD.  For  through hole type such as  DIP-6  which  has 6 pin   DIP-4  which   has  4   pin  etc.

test  integrated   circuit    OPTOCOUPLER    ICs
Optocoupler   MCT2E  DIP-6   Package

I   will    use MCT2E   for example testing.  After researching with datasheet we know input is LED
terminal   number .  1   is  Anode and  terminal  number 2  is  cathode , this case ,  we  will check it by using  the same method  as   LED checking.   The dot on ICs body mean that the first pin start from that.   The   output  is  a   transistor pin number  6 is  Base terminal ,  pin number  5 is  Collector terminal and  pin number   4   is Emitter terminal , so  checking method  it  has the  same method  as  transistor  checking.

Step  to  test   Optocoupler.
1.  Input   Checking.

HOW TO TEST LED by digital and Analog multimeter test led with multimeter

  Test   LED   with   Digital  and  analog  multimeter 

Test LED
test  led  with  multimeter

LED  is   a    kind  of  diode  and  it is a  basic electronic device on circuit so  it's good to know  how to check LED  good or bad.  The common size available on  the market is  3mm  5mm and  10mm Dia which is popular type  and other size and style  are  produced  too but it  use with some equipment.  . Before checking  LED , it  need  to know the most important information
1). Specification of  LED    2) Test  Function of multimeter    to check  LED.
After learning  these 2  points   then  we  can  move to  step  to LED checking.

Light emitting  Diode  LED
LED  size  and  color

1). Specification of  LED.
Led   is  a  low current consumption  device.  Don't let too much current  flow through it when using  at circuit  it always  need  limiting current resistor to decrease the current.   Limiting resistor calculation will  be discussed  when make a circuit design.   Generally small led need current  around  10-25mA and  big led  around 20-50mA  so  when  check it  by analog multimeter  use the proper current range  to check it and don't hold the test  lead  for a long  minute   , we  will describe on the  next section.

Multimeter use how to test DIODE by multimeter

HOW TO  TEST   DIODE   by digital multimeter  and  Analog multimeter

Test  Diode

Diode   is  a  basic electronic device and it  has wide application  on   many  circuit such as  rectifying , switching ,  protection circuit  , polarity protection  etc. Before checking   it  need to know  a necessary information about diode.   Diode has many package below is some example. On its body  has  shown  diode symbol so that you  can  know its   terminal function   anode or cathode.

This   is  a   symbol  of  diode ,  Anode for  positive voltage ( + ) and  Cathode for negative voltage.   If   supplying  the right polarity voltage  to  the   diode  terminal  ... V+   to  anode and V-  to cathode   this  called  " Forward  Bias "    this case diode will let current flow.  If   supplying  reverse polarity to the  diode ..... V-  to  Anode terminal  and  +  to  Cathode terminal ,  this case diode will block current and  no current flow   this called reverse bias.   In case of  reverse bias there is only  leakage current  flow and  amount  as uA or  mA  for  Germanium Diode and  there is   not  any leakage current  for  Silicon Diode.

Test  Diode
Example  of   Diode  Package 

Diode symbol

DO package  (  DO = Diode outline )

Stud  package  it   has screw and nut to tighten the wiring  connection.