Products > Test Equipment
FNIRSI LCR-ST1 (Inexpensive LCR Tweezers)
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csuhi17:

--- Quote from: Rooster Cogburn on August 10, 2024, 08:37:15 am ---I know, hence me asking if anybody has tried these. Never know with FNIRSI if the firmware actually works. The Miniware tweezers seemed interested but they also seem to have software problems.


--- End quote ---

Not just the software.
it didn't want to calibrate itself properly for me after the update, it succeeded 1 out of 5.
After 3-4 months it started to have a contact fault.
first at the jack connector and then also at the tip.
Random off during use.
Its measurement accuracy depended on how I held it, how tight it was on the two legs, how much I pressed it together...
approx. I sorted 800-1000 SMDs just with it, and it was destroyed.

I hope for those who buy Fnirsi that they get a better quality one, unlike me.
4 out of 7 is garbage...
indman:

--- Quote from: csuhi17 on August 10, 2024, 06:16:54 pm ---I hope for those who buy Fnirsi that they get a better quality one, unlike me.
4 out of 7 is garbage...

--- End quote ---
I don't know how to write a proverb in English, which is in Russian.
"Ежики плакали,кололись,но продолжали жрать кактус..."
That's about right, I think you'll get the point:
"The hedgehogs cried,they're in pain from needles, but kept eating cactus..."  :D
indman:

--- Quote from: indman on August 10, 2024, 07:40:47 am ---Yeah, could be a re-brand. Can't find the ZOYI ZT-MD1 for sale on AE, no reviews anywhere either.

--- End quote ---
I found some short videos here, maybe it will be useful
https://www.bilibili.com/video/BV1EW421R74X/?spm_id_from=333.788.recommend_more_video.0
https://www.bilibili.com/video/BV1DT421k7Xr/?spm_id_from=333.788.recommend_more_video.5
Kosmic:

--- Quote from: Kosmic on August 10, 2024, 02:23:40 pm ---I was curious and ordered one on ebay. Found a seller listing at 26$US with free shipping  :o  can't really beat that price.

--- End quote ---

I received the package today.

Come in a nice storage case with extra tips, manual and usb cable.



Side by side with the MS8911



The output at 0.6v 1kHz



Some measurements (all done at 1kHz):

  SR720MS8911LCR-ST12nF 0.1%C: 2.0004 D: 0.00025C: 1.99 D: 0.000C 2.012nF / D 0.00401uF 0.5%C: 1.0001 D: 0.00031C: 1.000 D: 0.001C: 1.002 D: 0.0002500nF 0.5%C: 500.87 D: 0.00023C: 501.0 D: 0.000C: 503.4 D: 0.0040125nF 0.5%C: 125.31 D: 0.00018C: 125.0 D: 0.000C: 126.1 D: 0.00325nF 0.5 %C: 5.0054 D: 0.00024C: 5.00 D: 0.000C: 5.022 D: 0.0027160 pFC: 160.07 D: 0.00140C: 1.6 D: 0.001C: 164.0 D: 0.000210mHL: 9.4265 Q: 59.970L: 9.38 Q: 78.60L: 9.474 D: 0.014450mHL: 48.070 Q: 83.446L: 48.04 Q: 85.60L: 48.23 D: 0.0160100mHL: 95.425 Q: 82.799L: 95.3 Q: 83.33L: 95.77 D: 0.0160100Ohm 0.1%R: 100.32R: 100.3R: 100.41kOhm 0.1%R: 1.0002R: 1.001R: 1.00110kOhm 0.1%R: 9.995R: 10.00R: 9.934100kOhm 0.1%R: 99.925R: 100.0R: 99.931MOhm 0.1%R: 0.9983R: 1.001R: 1.00

So overall I'm pretty satisfied. Measurement is fast, accuracy seem to be in specs, form factor is small and light and the screen is bright and easy to read.

On the other hand, the secondary parameters are always the same. Rs and D. There is no way to get, for example, Q when measuring inductors. Build quality seem to be low but has to be expected from a 30$ device. Ex, there is only 1 screw holding each the tips. Not sure if they are going to last.
Kosmic:
Ok so, to get more secondary parameters, you need to store the values on the device (using hold) and then connect via USB to retreive the .csv file

Ex of .cvs file you will find on the device:

No.TypeLevel(Vrms)Frequency(Hz)Value(R nF uH V)Rs(R)QDZ(R)X(R)1C0.61000100.64684.0688388.64190.00261574.11631581.3212C0.6100010.083535.4682445.00960.002215713.259815783.69433C0.610001.028465.6831332.46640.003154824.6875154823.98444C0.610000.09713353.3528355.16820.00281180783.51191004.125
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