E255-5D-W15L L1 Activity 2 by Teo Chee Seng (RP) https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc Q1. In the testing of a diode using an analogue multimeter, can you describe a simple way to check if the diode is faulty? Q2. What are the differences if you were to use a digital multimeter (DMM)? en-us 2023-10-19 07:47:16 UTC 2023-10-20 04:00:58 UTC hello@padlet.com Team 1 https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755643932 Q1) 
Method 1:  Faulty in the open circuit condition then the reading will be high resistance (or open circuit) in both directions. Failed in the short circuit condition it will show low resistance in both directions. 
 Method 2: Diode test position (internal 2.5 – 3.5 V). Serviceable diode will show around 0.7 volts when tested in the forward bias direction and will show the internal voltage of the meter when tested in reverse bias. For failed open circuit, it will show the internal voltage of the meter in both forward and reverse bias. Failed in the short circuit condition it will show zero (or nearly zero) in both direction. 
 
Q2) 
An analogue multimeter may not automatically detect diode polarity and has to be adjusted by user and in the case of a digital multi-meter, it has to be equipped with a special "diode check" function, where it uses forward bias position and read that the voltage drops across the diode in volts instead of a resistance. (typically from 0.5V to 0.7V)
]]> 2023-10-20 03:57:39 UTC https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755643932 Team 3 https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755644397 1. Faulty or Shorted Diode: If the needle deflects to the left (towards zero or close to zero), it means the diode is shorted and faulty. In this case, current flows in both directions.

 

2. An analogue multimeter uses a needle that moves along a scale to indicate the value of the measurement. A digital multimeter uses a numeric display to show the exact value of the measurement.

]]> 2023-10-20 03:58:06 UTC https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755644397 team 5 https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755644520 ·       To check if its faulty or shorted diode, the needle will deflect to the left (towards zero or close to zero), it means the diode is shorted and faulty or both. In this case, current flows in both directions.
 

·       2. digital multimeter uses a numeric display to show the exact value of the measurement whereas an analogue multimeter uses a needle that moves along a scale to indicate the value of the measurement.
]]> 2023-10-20 03:58:14 UTC https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755644520 Team 4 https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755644798 Question 1

1. Set your multimeter to diode test mode. This is usually a symbol of a diode with a positive and negative lead.
2. Identify the anode and cathode of the diode. The anode is usually marked with a stripe or band, while the cathode is not.
3. Connect the red lead of your multimeter to the anode of the diode and the black lead to the cathode.
4. The multimeter should display a forward voltage drop of around 0.7 volts. If it does not, or if it displays a much higher voltage drop, the diode is faulty.
5. Reverse the leads of the multimeter and connect the red lead to the cathode and the black lead to the anode.
6. The multimeter should display an infinite resistance. If it does not, or if it displays a very low resistance, the diode is faulty.

Question 2

Advantages of using a Digital Multimeter to test diodes is that it has a dedicated diode test mode. This mode applies a small voltage to the diode and measures the voltage drop across the diode. This gives a very accurate indication of whether the diode is good or bad.

]]> 2023-10-20 03:58:31 UTC https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755644798 team 2 22041473_2 https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755644802 Q1) Select the resistance (Ω) range on the multimeter. 
  
Attach the black lead to the diode's cathode and the red lead to its anode.In one direction (forward bias), the needle should exhibit low resistance, and in the other (reverse bias), high resistance.The diode may be defective if the needle does not move as it should. 

Q2) Precise resistance readings are provided using a DMM. 
  
It frequently features a specific diode test function.Diode polarity can be automatically detected by DMMs.They are precise and convenient, particularly for fast diode tests. 
]]> 2023-10-20 03:58:31 UTC https://padlet.com/teo_chee_seng1/oxhyemkzqu429bkc/wish/2755644802