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LCR Tweezer Fnirsi ST1 vs. Zoyi MD1

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indman:

--- Quote from: u37 on September 29, 2024, 09:40:31 am ---
--- Quote from: indman on September 29, 2024, 09:25:08 am ---The Z:50.9mОhm reading on the right side of the display is probably the impedance of this battery at 1kHz?  :)
--- End quote ---
Note that the value is approximately correct. ))

--- End quote ---
Yes, that value does look real.

Here is another interesting novelty from Chinese friends, which can operate at a frequency of 100kHz, and which can be used as a smart tweezers.
https://www.banggood.com/LCR-P1-Pro-Smart-LCR-SMD-ESR-Tester-Precise-Measurements-Capacitance-Inductance-Resistance-1200mAh-Battery-1_54-inch-Color-Screen-Portable-Testing-Tool-for-Continuity-p-2021059.html?rmmds=detail-left-hotproducts&cur_warehouse=CN&ID=49510&trace_id=845b1727546126217
But I don't think such a shaped instrument would be as convenient to work with as tweezers. :)

DCFluX:
These are 10uF ceramic capacitors that I sourced from Mouser.

Paul T:
@DCFluX 100 Hz would be best when above 1uF, looks like yours is set to 1kHz.  Please recheck at 100 and see if you get the same improvement.  :popcorn:

Here's some easy-to-remember rules of thumb.  Once you get the general measurement at 1kHz, switch to the best frequency for better accuracy if needed.

For capacitors
10kHz for pF
1kHz for nF
100Hz for μF

For inductors
10kHz for μH
1kHz for mH
100 Hz for H

I don't know of any meters that adjust the frequency for you automatically.  Most good meters work the same as these tweezers.  If you get a full-sized LCR bridge, you'll also need to learn whether series or parallel method should be used for your device or circuit.

Meters with 100kHz can be more accurate at low pF or nH measurements.

Paul T:
In my experience, high-value dipped MLCC tend to produce the greatest capacitance value variation from device to device.  Not sure why.  Unless I need low leakage around 10uF, I usually choose a polarized cap.   Ceramic caps tend to be negatively impacted by DC bias, polarized caps require DC bias.

Here's my comparative measurements with a LCR meter, changing only frequency.  Transistor testers tend to be off by about 20% in my experience.

mawyatt:
The basic issue with Tweezers, Handhelds and Component Testers is the limited amount of DUT test voltage and current available. This is where the more expensive Bench Lab Grade LCR Meters come in, they have the ability to support higher DUT test voltage and currents, as well as higher frequencies to evaluate the DUT.

If one considers a low Z component with 10 milli-Ω impedance @ frequency, a handheld or tweezer that can deliver say 10mA RMS (14mA peak) produces only 100uV RMS across the DUT. This is a small and difficult voltage level to measure accurately. Whereas a bench LCR Meter can deliver over 100mA RMS to the DUT and thus produce a higher measurement voltage which yields a better result, and can do so at higher frequencies well beyond what handhelds and tweezers can support.

Similar situation for high Z components, a handheld or tweezer can only deliver a small DUT excitation voltage and thus the measured DUT current is very low and difficult to measure accurately. If DUT is a small capacitance (high Z) then increasing the frequency can help however most handhelds and tweezers have a limited frequency range. Again a Lab Grade Bench LCR Meter can supply a higher DUT excitation voltage at a higher frequency for better characterization of high Z components.

If one wishes to study the effects of various signal levels and/or bias levels on the DUT, then Bench LCR meters are the likely choice as handheld and tweezers have limited, or no abilities within these areas.

These are a few reasons the Lab Grade Bench LCR Meters cost more :-+

If one is considering acquiring high fidelity DUT component measurements, it's a good idea to understand the limitations of various potential use instruments, which is a valid concept for any measurements in general :-+

Best   

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