Products > Test Equipment
LCR Tweezer Fnirsi ST1 vs. Zoyi MD1
awakephd:
The Zoyi MD1 will display the diode direction (and voltage drop? I think? I didn't pay much attention to that, as I was only interested in polarity) for an ordinary silicon diode, but it cannot test an LED. Frankly, with only .6V, I am surprised it can get over the threshold for an ordinary diode!
skander36:
The complain come from the fact that diode function is behave like is not working. The voltage is the same in both directions!
On Fw1.3 the minuscule diode icon on left is not changed at all. So with that behavior for someone used to check a diode with a DMM this function seem to not working.
I have installed 1.5 fw and indeed now the icon is rotating to show the sense of diode. But the voltage is still the same in both directions. Is the same AC signal (0.6V AC) used to check the LCR components so maybe they should apply a separate voltage for diode.
Anyway for his price this device is pretty good because they manage to read LCR values with reasonable precision in most of the cases.
LE - In this video at 6:14 the diode test realized by one youtuber. -
awakephd:
Since it gives you the polarity, it seems to make sense that it shows the same voltage either way - it is giving the voltage drop (perhaps not very accurately), and indicating the direction of that voltage drop with the icon on the left. Or at least, that is how I understood it - ?
Aldo22:
How do you interpret that?
GM328A says 705mV, AN8008 says 621mV and ZT-MD1 says 520mV.
The diode was a 1N4148. The datasheet says Vf=1V, if I read that correctly.
Are they all off, or what does that mean?
KungFuJosh:
--- Quote from: Aldo22 on September 19, 2024, 07:53:44 pm ---How do you interpret that?
GM328A says 705mV, AN8008 says 621mV and ZT-MD1 says 520mV.
The diode was a 1N4148. The datasheet says Vf=1V, if I read that correctly.
Are they all off, or what does that mean?
--- End quote ---
"Forward voltage: IF = 10 mA, VF 1V (max)"
The datasheet says to expect 1V maximum Vf with If at 10mA. You're under that, and I'm assuming it's unknown what the test current level is.
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