Hello electronics experts,
On a few occasions I notice experienced technicians inspect for short circuit in diode mode on multimeter. This is OK and in some way equivalent to resistance mode, but more specifically I noticed that they put red probe on ground and black probe (connected to COM input on multimeter) is placed on the rail or pin.
I wonder why is that. Why not place black probe of multimeter on the ground and red probe on the rail which is tested for short?
Can you clarify this? When I test if something is short I use diode mode First and then double check by measuring actual resistance against the ground.
One more thing, if multimeter shows me on one place (in diode mode) 380 and on some other place 680 to the ground, what I should conclude from this reading?
I know that in both cases there is no short to ground, but what this 2x number in second case should tell me?
Thank you!
On a few occasions I notice experienced technicians inspect for short circuit in diode mode on multimeter. This is OK and in some way equivalent to resistance mode, but more specifically I noticed that they put red probe on ground and black probe (connected to COM input on multimeter) is placed on the rail or pin.
I wonder why is that. Why not place black probe of multimeter on the ground and red probe on the rail which is tested for short?
Can you clarify this? When I test if something is short I use diode mode First and then double check by measuring actual resistance against the ground.
One more thing, if multimeter shows me on one place (in diode mode) 380 and on some other place 680 to the ground, what I should conclude from this reading?
I know that in both cases there is no short to ground, but what this 2x number in second case should tell me?
Thank you!
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