Products > Test Equipment
LCR Tweezer Fnirsi ST1 vs. Zoyi MD1
Paul T:
Hi Scott, Did you try calibration? I assume the FNIRSI has a similar menu item to the ZOYI where you can go in to zero out any offset by doing the 0 ohm cal.
Frex:
--- Quote from: TheDefpom on September 25, 2024, 08:17:12 am ---I just recorded a review for the FNIRSI and found that I could not zero them, the manual states it can be done, but in my case is doesn't actually zero, but goes down to NEGATIVE mOhm's, from power up it does -38mOhm when shorted, if I put a 100mOhm resistor on it I get about 67mOhm... trying to zero gets WORSE, down to negative 66 or so, and then negative 102mOhm or so ! if I then put the 100mOhm on it, I get about 2mOhm !
Tried all different things, no good.
It's on V1.3, tried to install V1.5... firmware doesn't take, I get the disk on the computer, and have boot loader 0% on screen, but copying the firmware .bin over results in no change at all, nothing happens, again tried doing it different ways, no good, probably because I am on a Mac rather than a PC.
UPDATE tried on a PC and got firmware updated, didn't fix the zeroing issue though, that is no different.
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Hello,
I have experienced same issue.
To solve this, I had need to calibrate it (I had seen the procedure on a linked video in another FNIRSI ST-1 thread)
When it is in off state, you need to push the toggle knob at left and push power button at same time to go in such mode.
Then you see the calibrate screen and you can select calibrate value between short, 1, 10, 100, 1k, 10k, 100k, 1M,10M and open.
Of course you need precise resistor value of each.
I hope that help.
Regards.
Frex
Paul T:
And if it’s out of cal because of experimenting with that part of the menu, you are supposed to be able to restore the factory setting using the reset feature in the menu.
DaneLaw:
--- Quote from: Frex on September 25, 2024, 11:13:45 am ---..
When it is in off state, you need to push the toggle knob at left and push power button at same time to go in such mode.
Then you see the calibrate screen and you can select calibrate value between short, 1, 10, 100, 1k, 10k, 100k, 1M,10M and open.
..
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Thx for the info, about the hidden cal-menu that pops out with toggle-to-left (while a push-in activates the bootloader)
Do you know if such a manual user-calibration takes precedence, or will its "menu/restore" flip ST1 back to scratch and remove a given user cal.?.
Over the top. packaging Fnirsi are using when shipping these ST1, if such packaging are the norm.
The product is already safely inside its own form-fitted hardcasing and with a promo-cardboard outside, - seems quite excessive to also put it inside a massive flamingo-temperature resistant box that elevates the footprint numerous times, but then again, better safe than sorry, as parcel across the globe can be harsh affaire..
Looks like the battery is quite a bit bigger on Zoyi MD1 (400mAh) than ST1 (250mAh)
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DCFluX:
I was looking to replace my original Smart Tweezers with something a bit newer so I figured I'd give the Fnirsi LCR-ST1 a try.
So far a big draw back that I just discovered is the inductance scale. Lowest display reading is 0.0uH, and it does not have enough display resolution to be useful for parts in the nanohenry range which is really what I need it to do for RF work.
I am impressed with the full color display but my second gripe is there is no way to flip the display, which I also need because I am left handed.
I have to do some more testing but I just clipped on to two capacitors that were 39pF and one measured 51 and the other 59.
I just tried some more capacitors and whoa, weird results for sure. So on my bin of 1, 2.2 and 4.7uF the readings on the different caps all look about in spec for the tolerance but on the 10uF parts they are reading anywhere between 6.8 and 7.5uF and I can take those same parts to another component tester and have them read around 9.85 to 10.2uF
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