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- Roger Dewhurst
January 11, 2006, 2:13 am
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I have a Digitor 20 MHz (ex Dick Smith) oscilloscope which I bought some
years ago when money was burning a hole in my pocket. I unpacked it the
other day to familiarize myself with it. I tested various components,
resistors, capacitors, diodes etc. and found that I got two quite different
respones fro LEDs. Some generated the right angled trace supposedly typical
of diodes while some generated the 9 o'clock flat portion of the trace but
the other half angled off to about 1.30. The Zener diode that I tested
responded as though it was an ordinary diode. Informative comment would be
A zener will look like a normal diode in the forward direction. The
"component tester" on your oscilloscope may not generate a high enough
voltage to break down the zener in the reverse direction.
They don't make many scopes with component testers these days!
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