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Shannon ST42 LCR Tweezer Test and Comparison Thread

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KungFuJosh:
That makes perfect sense. I'm still curious about whether there's any perceivable effect changing the modes while testing in circuit.

Most things like that in circuit usually need to have one side lifted to be tested. It's cute when these type of devices think they can magically isolate the DUTs. Maybe someday the science will pass the magic thinking. 😉

thm_w:

--- Quote from: Martin72 on August 06, 2024, 07:20:36 pm ---This is rather sobering when you consider that the measurement in circuits was emphasized as a point.
--- End quote ---

Usually when we talk about in circuit measurement for capacitors, its RC filters, series DC block caps, caps in opamp filter circuits, etc.
Or for repair, decoupling caps, often we can still measure the bulk value and its overall ESR. Reading the 100nF's value alone is generally not important.

Of course domain dependent as well, if its all ultra low <10pF values, then more likelyhood of the reading being wrong.

Martin72:
After testing it for a while, here is my preliminary conclusion on the ST42.
+ Very narrow construction factor
+ Very fast measuring speed, the fastest I have experienced to date.
+ Still accurate, within its own tolerance
+Outstanding display, nothing can beat OLED
+L measurements included, many measuring tweezers only offer R and C.
+Additional parameter displays
+Dedicated ESR mode
+DC resistance mode
+open/short calibration option as with the "large" lcr meters
+Excellent operation with a single element, the multi-way joystick.
Virtually blind operation after a short familiarization period.
+Display: right/left-handed mode
+Overall a well thought-out concept
+Excellent: 4-wire design up to the measuring tips
+Firmware update option
+Very good support, continuous updates
+Excellent price/performance ratio

O Design-related mechanical restriction with regard to the components to be measured
O Battery operation: Unclear situation regarding the battery used, is it replaceable, is it a regular type available everywhere?
O Measuring frequency maximum 10kHz, no disadvantage, because it shows that the developer is aware that higher frequencies entail other circuit requirements that could not be met due to the design, other suppliers could take an example from this.

- Housing processing in the display area
- No local distributors, only available via Aliexpress

I was attracted to these measuring tweezers because so many people were so enthusiastic about them.
I tend to be skeptical about such praise, but I was pleasantly surprised.
The measuring speed is breathtakingly fast, the accuracy is good considering the design, although not outstanding, and the OLED display does an excellent job.
For the money an excellent device which has now rendered my Mastech LCR measuring tweezers out of work, the ST42 is simply outstanding in comparison.
For me, however, the ST42 is not a complete replacement for all LCR measurement tasks, as the measurement voltages/frequencies/currents are too low and the tolerances in terms of accuracy are too high.
But I think it would be perfectly adequate for 80...85% of all users and makes a further investment superfluous.
Especially if Shannon would take up my idea regarding adapters for larger measuring objects and offer a purchasable alternative. ;)
Anyone who has been considering a DER DE-5000 should take a closer look at the ST42.
My personal LCR Meter ranking:
-ET35
-ST2830
-ET45
-ST42
-ET44
-DE5000

Summary: Good !  :-+

Martin




KungFuJosh:
I agree with almost all of that, but there's no way I would believe the ET35 is superior to the ST2830. The nightmares you discussed alone are too much. Also, I had no trouble connecting to my ST2832 via Serial to USB adapter for SCPI and remote control.

The ET35 having an ethernet port doesn't make it better, especially since it barely works. 😉

ET definitely tries to be better at support than TongHui though, I'll give them that. ET tries, but fails while TH refuses to even pretend to care. That's where ST is superior, since they eventually force TH to provide updates and such.

...and that's ignoring that ET put the BNCs on backwards. 😉😉😉

Sparrow:
Thank you Martin72 for your evaluation and comparison of these tweezers.

For my very occasional hobbyist needs, I still think the MS8911 is adequate for ME.
I do like the idea of them though.
I nearly bought the Shannon but Aliexpress kept cancelling my order and I didn't have the luck the other person had of it ever going through.

There appears to be a new LCR Tweezers on Aliexpress now.
I'm sure that they are not in the same league but are much cheaper if that's a concern for people.
It would be interesting to hear your thoughts on these:
"FNIRSI LCR-ST1 Mini Smart Tweezer LCR SMD ESR Tester Resistance Capacitance Inductance Continuity Diode Test Measurement Tools"
https://www.aliexpress.com/item/1005007481162384.html

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