RhapsodyOfFire
New Member
Hello to all!
I have a 1N4007 diode which I measure has 5.2 megaohms resistance positive to negative. The opposite resistance is so high I cannot measure it.
But in one article here https://www.ehow.com/how_7556262_test-1n4007-diode.html it says there must be short between anode and cathode from + to - and big resistance - to +.
Only the second part of this is true. Is the diode damaged? Also is it rectifying DC to aroud 1000 volts and why does it say "Reverse voltage" in this article https://www.futurlec.com/Diodes/1N4007.shtml or is it the voltage the diode can sustain while working in reverse and not allowing it to pass in reverse direction?
This diode is on a scheme for power inverter on an LCD display .
Something is causing a short circuit between + and - right after the bridge rectifier but the bridge rectifier is okay testing each of it's four diodes.
While the diode is soldered on the board I measure 159 ohms only and the voltage measuring diodes it 0.074 in both directions. So there must be a parallel resistance near it connected but why when measured as external I get 5.2 mega ohms... I am sure I don't mistaken Mega with milli because it doesn't measure short circuit between positive and negative lead on the diode.
I have a 1N4007 diode which I measure has 5.2 megaohms resistance positive to negative. The opposite resistance is so high I cannot measure it.
But in one article here https://www.ehow.com/how_7556262_test-1n4007-diode.html it says there must be short between anode and cathode from + to - and big resistance - to +.
Only the second part of this is true. Is the diode damaged? Also is it rectifying DC to aroud 1000 volts and why does it say "Reverse voltage" in this article https://www.futurlec.com/Diodes/1N4007.shtml or is it the voltage the diode can sustain while working in reverse and not allowing it to pass in reverse direction?
This diode is on a scheme for power inverter on an LCD display .
Something is causing a short circuit between + and - right after the bridge rectifier but the bridge rectifier is okay testing each of it's four diodes.
While the diode is soldered on the board I measure 159 ohms only and the voltage measuring diodes it 0.074 in both directions. So there must be a parallel resistance near it connected but why when measured as external I get 5.2 mega ohms... I am sure I don't mistaken Mega with milli because it doesn't measure short circuit between positive and negative lead on the diode.
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