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LCR Tweezer Fnirsi ST1 vs. Zoyi MD1

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Aldo22:

--- Quote from: KungFuJosh on September 19, 2024, 08:23:05 pm ---"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.

--- End quote ---

That's right, thank you. I had forgotten about that.
So:
An8008: 1.4mA -> 620mV
GM328A: 4.2mA -> 714mV
ZT-MD1: 0.058mA -> 520mV

This is somewhat consistent with the data sheet.

KungFuJosh:

--- Quote from: Aldo22 on September 19, 2024, 09:41:15 pm ---That's right, thank you. I had forgotten about that.
So:
An8008: 1.4mA -> 620mV
GM328A: 4.2mA -> 714mV
ZT-MD1: 0.058mA -> 520mV

This is somewhat consistent with the data sheet.

--- End quote ---

The first two look okay based on Figure 4, but the MD1 looks high looking at Figure 3. 60µA looks like it should be 475mV...but whether that's off because the MD1 isn't great, or because of ambient temperature is another question. Was it -25C while testing? 😉

Aldo22:

--- Quote from: KungFuJosh on September 19, 2024, 10:03:55 pm ---The first two look okay based on Figure 4, but the MD1 looks high looking at Figure 3. 60µA looks like it should be 475mV...but whether that's off because the MD1 isn't great, or because of ambient temperature is another question. Was it -25C while testing? 😉

--- End quote ---
I don't know that. It could be that the hand warms it up.
But maybe I measured it wrong.
The MD1 uses sine waves to measure diodes.
I'll have another look tomorrow.

EDIT: If I measure the AC current (TRMS), I get 0.14mA. That looks better

Paul T:
I described the diode function (and other things) in my blog here:

ZOYI ZT-MD1 Bonus Review

Aldo22:

--- Quote from: Paul T on September 20, 2024, 02:00:53 am ---I described the diode function (and other things) in my blog here:

--- End quote ---

Yes, I had already read it.
Very nice review!
And yes, I also didn't understand why Rs and Q are not logged.

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