Billy Mayo
Member
At work , I ran into a guy that said how he test FET's in circuit
You said that he uses a ohm meter ,
he puts it across the Source and drain and it should be 200ohms to 700ohms if its GOOD,
If the FET is open from Source to drain , the ohm meter will measure in the MEGohms
To test if the GATE is working, you can use an external DC power supply and look up the FETS datasheets on how many DC voltage the GATE to be turned ON or OFF
I'm guessing you do this when the circuit is OFF
The FETS are in circuit well testing them
I Tried using the Diode checker mode on my DVM meter to check the FETS , but the voltage will intergrate up or down depending on the polarity of the red/black meter wire you have on the FET's pins
In Diode check mode on my DVM meter, when the FET is shorted , it will make a BEEP sound
You said that he uses a ohm meter ,
he puts it across the Source and drain and it should be 200ohms to 700ohms if its GOOD,
If the FET is open from Source to drain , the ohm meter will measure in the MEGohms
To test if the GATE is working, you can use an external DC power supply and look up the FETS datasheets on how many DC voltage the GATE to be turned ON or OFF
I'm guessing you do this when the circuit is OFF
The FETS are in circuit well testing them
I Tried using the Diode checker mode on my DVM meter to check the FETS , but the voltage will intergrate up or down depending on the polarity of the red/black meter wire you have on the FET's pins
In Diode check mode on my DVM meter, when the FET is shorted , it will make a BEEP sound