question please , can these be resistance tested in situ i.e still installed onto pcb with other pcb components still present but removed from the pcb power supply ? obviously not powering them with external rated power 12v in this case while still connected is probably a bad idea but will the circuit affect the readings.
I got this from chatgpt Yes, you can test a relay while it is on the board, but it requires careful handling to ensure the circuit is not damaged and accurate results are obtained. Here's how you can do it: 1. Visual Inspection Look for any visible damage, corrosion, or burnt marks on the relay or the surrounding circuit. --- 2. Continuity Test (Multimeter) Power off the circuit. Use a multimeter in continuity mode to test the relay's contacts: Check the normally open (NO) contact-it should have no continuity. Check the normally closed (NC) contact-it should have continuity. This test checks the default state of the relay
@@ashrafkarjiker6888 If you never found out. (I checked with chat gpt.) Yes, it is possible to test a relay in-circuit on a PCB, but the process can be more complex than testing it off the board. It requires caution to avoid misinterpreting results due to the influence of other circuit components or causing damage to the PCB. Here's how you can approach it: --- Steps to Test a Relay In-Circuit 1. Identify the Relay Terminals Locate the coil terminals and contact terminals on the PCB using the schematic or by tracing the circuit. --- 2. Power Off the Circuit Turn off and disconnect any power supply to the board to avoid electric shock or damaging the components during testing. --- 3. Check Coil Resistance Use a multimeter in resistance mode to measure the relay coil resistance directly on the PCB: Place the probes on the coil terminals. Compare the measured resistance with the relay's datasheet value to verify the coil is intact. --- 4. Test Contact States (Without Power) With the multimeter in continuity mode: Check the Normally Open (NO) contact-it should not have continuity. Check the Normally Closed (NC) contact-it should have continuity. --- 5. Power On and Activate the Relay Power the PCB and apply the appropriate control signal to activate the relay coil: Listen for the click sound, indicating the relay is switching. While the relay is activated, check the NO and NC contacts again: NO Contact: Should now have continuity. NC Contact: Should now be open. --- 6. Voltage Check Use a multimeter to measure the voltage across the relay coil when activated: Ensure the coil is receiving the specified voltage. Measure the voltage at the contacts to verify they are switching correctly and delivering the expected output. --- Challenges and Considerations Influence of Other Components: Other components on the PCB can affect the measurements. For example, resistors, capacitors, or diodes connected to the relay may alter the multimeter readings. False Readings: Ensure you're isolating the relay's behaviour as much as possible by interpreting results carefully. Circuit Damage: Be cautious when powering the PCB or probing the relay to avoid short circuits. --- When to Remove the Relay If the in-circuit testing results are inconclusive due to interference from other components, desoldering the relay and testing it out of the circuit is often the most reliable method.
Thank you. This was a good easy to understand explanation.
Understandable,thank you Sir
So nice of you
Great demonstration. Thanks!
Glad it was helpful!
Really appreciate you sir ❤️❤️❤️
👍👍👍👌
question please , can these be resistance tested in situ i.e still installed onto pcb with other pcb components still present but removed from the pcb power supply ? obviously not powering them with external rated power 12v in this case while still connected is probably a bad idea but will the circuit affect the readings.
When DC voltage passes through inductor it doesn't create magnetic filed???
Wow excellent
You are very welcome, everyday new amazing videos like that one.
Are you happynow
I gave like tothe video too
@@electronicsrepairbasics_erb diode protect the circuit from reverse coil relay voltage. Why is diode not present? Please explain.
thanks alot sir for nice lesson, I would like to ask if you test without removing it Frome the board does it gives correct value?
I got this from chatgpt
Yes, you can test a relay while it is on the board, but it requires careful handling to ensure the circuit is not damaged and accurate results are obtained. Here's how you can do it:
1. Visual Inspection
Look for any visible damage, corrosion, or burnt marks on the relay or the surrounding circuit.
---
2. Continuity Test (Multimeter)
Power off the circuit.
Use a multimeter in continuity mode to test the relay's contacts:
Check the normally open (NO) contact-it should have no continuity.
Check the normally closed (NC) contact-it should have continuity.
This test checks the default state of the relay
Thank you very much Sir.
If possible please make a video on Optocupler testing. 4 pin and 6 pin.
You are very welcome.
Ok I will make it today for you.
@@electronicsrepairbasics_erb sir, why dont you used DIODE in the car relay? Where is the diode? Please explain why diode is not present in the relay?
Can you apply voltage to the relay and measure continuity and resistance? Will not damage the multimeter?
thank you sir
All the best
Can you use a bench power supply to apply voltage to the relay and is it always 12 volts
The relays have usually the working voltage of 12VDC and 24VDC.
Is it possible to test the relay in circuit on PCB board
@@ashrafkarjiker6888
If you never found out. (I checked with chat gpt.)
Yes, it is possible to test a relay in-circuit on a PCB, but the process can be more complex than testing it off the board. It requires caution to avoid misinterpreting results due to the influence of other circuit components or causing damage to the PCB. Here's how you can approach it:
---
Steps to Test a Relay In-Circuit
1. Identify the Relay Terminals
Locate the coil terminals and contact terminals on the PCB using the schematic or by tracing the circuit.
---
2. Power Off the Circuit
Turn off and disconnect any power supply to the board to avoid electric shock or damaging the components during testing.
---
3. Check Coil Resistance
Use a multimeter in resistance mode to measure the relay coil resistance directly on the PCB:
Place the probes on the coil terminals.
Compare the measured resistance with the relay's datasheet value to verify the coil is intact.
---
4. Test Contact States (Without Power)
With the multimeter in continuity mode:
Check the Normally Open (NO) contact-it should not have continuity.
Check the Normally Closed (NC) contact-it should have continuity.
---
5. Power On and Activate the Relay
Power the PCB and apply the appropriate control signal to activate the relay coil:
Listen for the click sound, indicating the relay is switching.
While the relay is activated, check the NO and NC contacts again:
NO Contact: Should now have continuity.
NC Contact: Should now be open.
---
6. Voltage Check
Use a multimeter to measure the voltage across the relay coil when activated:
Ensure the coil is receiving the specified voltage.
Measure the voltage at the contacts to verify they are switching correctly and delivering the expected output.
---
Challenges and Considerations
Influence of Other Components: Other components on the PCB can affect the measurements. For example, resistors, capacitors, or diodes connected to the relay may alter the multimeter readings.
False Readings: Ensure you're isolating the relay's behaviour as much as possible by interpreting results carefully.
Circuit Damage: Be cautious when powering the PCB or probing the relay to avoid short circuits.
---
When to Remove the Relay
If the in-circuit testing results are inconclusive due to interference from other components, desoldering the relay and testing it out of the circuit is often the most reliable method.
great
please explain why diode is not used?
Simply the diode is not used in relays because it is not necessary
@@electronicsrepairbasics_erb then how does the circuit protect itself from the huge reverse spike voltage produced by the relay??
Thaks
Can. You. Talk. Planet
sir, why dont you used DIODE in the car relay? Where is the diode? Please explain why diode is not present in the relay?
Diode is not necessary in the relay
@@electronicsrepairbasics_erb but what is preventing the reverse voltage spike generated from the relay coil if no diode were used?????
Hot. On. 30. Black. On. 87
Your videos have poor sound quality
Sorry about that
Be kind 🙏