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Shannon ST42 LCR Tweezer Test and Comparison Thread

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Martin72:
Hi,

LCR measuring tweezers, to which the greatest things are attributed, as the sole miracle tool that makes other LCR superfluous, where some people never tire of bringing them into play in every purchase advice....something like that makes me curious in principle. ;)
So I bought one from Aliexpress and it should arrive next week.
In addition to an incoming inspection in terms of appearance and manufacturing quality, the main component will of course be measurements.
I have thought of the following steps:
- Measurements on the DMM Plus Check reference, more precisely on its LCR option.
- Comparative measurements with the following devices:
Mastech LCR tweezers
ET4410 Benchtop LCR Meter
ET4510 Benchtop LCR Meter
Sourcetronic ST2830 Benchtop LCR Meter, calibrated
Agilent U1733C Handheld LCR Meter, calibrated.
GWInstek Milli-Ohm Meter, calibrated.
- Comparison measurements on components that are already integrated in a circuit.
- Comparison measurements cold start/ after a warm-up time.
The latter because it was said that with other devices you have to wait until they meet the tolerance.
I maintain that it doesn't matter. ;)
We'll see.
Furthermore, an attempt to see what maximum component size can still be measured mechanically without using aids such as wire extensions, which of course distort the result.
And one more thing, measurements on coils with a core, if their size allows it.
This could be interesting insofar as the measuring voltage of the ST42 is rather low.
I'm curious to see how it performs.
Why am I opening this thread now?
To collect further ideas, if you think of anything else, post it here.
Next post will follow when the ST42 has arrived.

Martin

tautech:

--- Quote ---I have thought of the following steps:
--- End quote ---
You missed speed of measurement and speed of use = convenience at the bench for the majority of tasks.

KungFuJosh:

--- Quote from: Martin72 on June 16, 2024, 09:46:19 pm ---- Comparison measurements cold start/ after a warm-up time.
The latter because it was said that with other devices you have to wait until they meet the tolerance.
I maintain that it doesn't matter. ;)

--- End quote ---
I agree, I don't actually usually wait the 30 minutes for the bench meter either, unless it's for something that really matters. Which is rare. 😉

However, you can often finish measuring with the ST42 by the time the bench meter goes from power on to ready even without warmup.


--- Quote ---Furthermore, an attempt to see what maximum component size can still be measured mechanically without using aids such as wire extensions, which of course distort the result.

--- End quote ---
If you leave the wire aids on, you can run calibration with the wires as part of the device to compensate for them...but you already know this. 😉

Hydron:

--- Quote from: tautech on June 16, 2024, 10:07:15 pm ---
--- Quote ---I have thought of the following steps:
--- End quote ---
You missed speed of measurement and speed of use = convenience at the bench for the majority of tasks.

--- End quote ---
+1 to this - the reason I never pick up my Mastech tweezers isn't due to any inaccuracy etc, it's that they are just so much worse ergonomically and speed wise compared to the ST42. You're not buying standalone SMD tweezers for top end specs, you're getting them for convenience (though obviously the more accuracy the better, and I look forward to seeing the numbers).

KungFuJosh:
I'll run some new comparison tests soon too. Here's the old result when I still had buggy firmware on my bench meter. The ST42 was very helpful with sanity checks.

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