Products > Test Equipment
LCR Tweezer Fnirsi ST1 vs. Zoyi MD1
DaneLaw:
Fnirsi's ST1 LCR tweezer and how it stacks up to Zoyi MD1 - pro & cons between them.
They do differ more than I expected, even though the test fundamentals are the same. (AC 0.3v 0.6v & 100, 1k, 10k Hz)
Will try to highlight some of the differences.
Values on these two units.
ZOYI MD1 =
0.6v AC (597.6mV)
0.3v AC (298.9mV)
100Hz = 100.4Hz
1K = 1004Hz
10k = 10.040Hz
[FW1.7]
Fnirsi ST1 =
0.6v AC = 604.9mV
0.3v AC = 302.7mV
100Hz = 100.8Hz
1K = 1008Hz
10k = 10.080Hz
[FW1.5]
* On the Fnirsi ST-1 you can toggle secondary parameters. [D, Q, Z or X] by pushing the jog-wheel, Im not familiar with that you can do that on the Zoyi MD1?..
* ST-1 datalog your values by hitting HOLD-button to an excel sheet on its internal memory.
* MD-1 does the same logging with HOLD (from fw1.7) but uses a txt-sheet.
* ST-1 indicates in the manual that you (at least to an extent) can zero/relative your value with a short push on the turn-on button.
* ST-1 has a significantly more pointy gold-plated tweezer tip than MD-1, same goes for the angled tips that come incl. with the bag-bundle, MD1 also comes with extra
gold plated tips, but looks like the same variant as the fitted ones.
* The thicker tips on the MD1 are more firm, than the longer & sharp ones on ST-1.
* ST-1 is fitted with 1 metal finger-screw at each side, and one secondary guide hole/connection point.
* MD1 tweezer tip is fitted with two inserted screws at each side, and the resistance reading on Zoyi MD1 do seem more stable than my ST1-unit that tends to bounce,
depending on pressure, & the connection points from tweezer tips to handle.
* ST-1 has a magnetic back, so you can attach things to it or hang it away on a metal surface.. it comes with an included metal disk with adhesive.
* ST-1 weighs 44g and MD-1 37g and a tad shorter-.
* MD-1 is significantly more stable in its reading than Fnirsi ST1.
* Would have preferred a 2-screw tipblade-fitting on Fnirsi ST1, as we see on MD1 and ST42 and most other LCR tweezers
* You can adjust the screen brightness, buzzer volume, screen orientation, time-delay for auto-off, and both units rely on the common TypeC charging interface for their
internal LIPO cell, while FW-update, is the same run-of-the-mill .bin file to root-folder.
* Zoyi MD1 Modes: Auto, Res, Capacitor, Inductor, Diode, Continuity buzzer with a given Ω value.
* Fnirsi ST1 Modes: Auto Res, Capacitor, Inductor, Diode/Continuity buzzer.
Overall I like them, though also worth having in mind, I dont have any other LCR tweezers, so some of the fondness could be down to a honeymoon LCR tweezer phase.
The MSRP on the Chinese market seems to be 138CNY (19.5$) and doesn't look to be any significant price difference between them in China, while on the western optimized reseller sites. the Fnirsi ST1 seems to be a tad more expensive, both use a 4wire kelvin measurement AC approach.
DaneLaw:
You can adjust the screens update rate on the Fnirsi ST1, as the update-rate seems to be sensitive to the selected frequency, so way faster update-rate at fx 10.000Hz (3 to 5 times per second) than fx 100Hz selected (around 1 time per second) while 1K/1000Hz is around 2 to 3 times per second.
This behavior ain't the case on Zoyi MD1, which stays around 1 update per second on all selected frequencies..
Video example with 100Hz, 1k, and 10K Hz and screen update rate that changes with frequency..+ toggling through secondary parameters. https://i.imgur.com/mXXOhh0.mp4
--- End quote ---
Zoyi MD1 [Atm latest firmware 1.7]
FW = https://zotektools.com/firmware-update-md1/
Manual = https://drive.google.com/file/d/1uJsOOQG1xBg4W1QcAgkmIN8IeYh9oZYz/view
Fnirsi ST1 [Atm latest firmware 1.5]
FW = https://www.fnirsi.com/cdn/shop/files/LCR-ST1-V1.5.zip
Manual English: https://static.eleshop.nl/mage/media/downloads/LCR-ST1-Manual.pdf
Manual CN/Eng. = https://www.fnirsi.com/cdn/shop/files/LCR-ST1-Manual.pdf
skander36:
ST1 fw. is 1.5 and still can't test diodes. It show 0.65V in both both directions.
DaneLaw:
I don't think I have tested either of them on diodes yet, It's kind of an uphill battle with 0.3v and 0.6v.
tautech:
--- Quote from: DaneLaw on September 18, 2024, 10:55:42 pm ---I don't think I have tested either of them on diodes yet, It's kind of an uphill battle with 0.3v and 0.6v.
--- End quote ---
Just how ?
Any half decent diode test will display Vf regardless of value.
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