Will it have an Auto mode ?
When measuring electrolytics ESR should be displayed.
What battery technology are you planning on using ?
Can you fit a tiny battery level bar meter on the display or will you just pop up a battery low warning ?
ESR would be implemented with Cap measuring,
When and at what price do you plan to sell?
ESR would be implemented with Cap measuring,Not in Auto mode ?
My old ST3 tweezers can do ESR in Auto mode.
How does it perform with MLCC?
Because the voltage coefficient of capacitance is quite bad with MLCC, the original Smart Tweezers did not read them correctly and needed firmware update.
Example 10uF 10V 0603 at 3V is -40% for only 6uF. If you use a single ramp (compared to AC) to measure capacitance, then the value will be incorrect.
How does it perform with MLCC?
Because the voltage coefficient of capacitance is quite bad with MLCC, the original Smart Tweezers did not read them correctly and needed firmware update.
Example 10uF 10V 0603 at 3V is -40% for only 6uF. If you use a single ramp (compared to AC) to measure capacitance, then the value will be incorrect.
Sure, it will have auto mode, which could distinguish the DUT type and recommend the appropriate frequency automatically
ESR would be implemented with Cap measuring, and Inductor measurement would have the similar Rs function.
We are trying to make it a real LCR meter, support those measurement modesReal LCR meter should be able to determine, in addition to ESR, also very important secondary parameters such as quality factor "Q" and dielectric loss tangent "D".
Without it, any tweezers turn into a regular beautiful toy like DT71.
The DUT is 5pf + 0.5pf @ 10kHz and 10nf 1% @ 1kHz MKP capacitorsCan you show a video where this capacitor is measured at least 3 times in a row?
Are you sure this tweezers needs this resolution of 0.0001pF?
When and at what price do you plan to sell?At present, we think the price will be around $100 for mass production
We will try to launch it on Kickstarter in one month. If crowdfunding is successful, the delivery time is expected to be two months
When and at what price do you plan to sell?At present, we think the price will be around $100 for mass production
We will try to launch it on Kickstarter in one month. If crowdfunding is successful, the delivery time is expected to be two months
This is too expensive to replace the wires of a stationary LCR meter.
You've seen that the pretty model DT71 is 2 times cheaper. I'm not talking about the price of simple tweezers UNI-T, Mastech and Holdpeak.
and the other way to get lower noise is by increasing the sampling time for averaging.
the basic accuracy we achieved is 0.1% now, so the last digit would be not displayed in the end.I watched the video, thanks! Once again I was convinced that the resolution of 0.01pF is quite enough for a meter with a 2-wire connection. All other extra digits are noise or random number generator.How does it perform with MLCC?
Because the voltage coefficient of capacitance is quite bad with MLCC, the original Smart Tweezers did not read them correctly and needed firmware update.
Example 10uF 10V 0603 at 3V is -40% for only 6uF. If you use a single ramp (compared to AC) to measure capacitance, then the value will be incorrect.I can't agree with you anymore, the excitation signal is a key factor for the performance
We used a pure AC signal for R/L/C components.I believe that floobydust is right in this question, so many serious tweezers allow you to select the voltage on the measurement pins from 0.1VRMS-1VRMS
How does it perform with MLCC?
Because the voltage coefficient of capacitance is quite bad with MLCC, the original Smart Tweezers did not read them correctly and needed firmware update.
Example 10uF 10V 0603 at 3V is -40% for only 6uF. If you use a single ramp (compared to AC) to measure capacitance, then the value will be incorrect.I can't agree with you anymore, the excitation signal is a key factor for the performance
We used a pure AC signal for R/L/C components.I believe that floobydust is right in this question, so many serious tweezers allow you to select the voltage on the measurement pins from 0.1VRMS-1VRMS
How does it perform with MLCC?
Because the voltage coefficient of capacitance is quite bad with MLCC, the original Smart Tweezers did not read them correctly and needed firmware update.
Example 10uF 10V 0603 at 3V is -40% for only 6uF. If you use a single ramp (compared to AC) to measure capacitance, then the value will be incorrect.I can't agree with you anymore, the excitation signal is a key factor for the performance
We used a pure AC signal for R/L/C components.I believe that floobydust is right in this question, so many serious tweezers allow you to select the voltage on the measurement pins from 0.1VRMS-1VRMS
This!
Make the excitation voltage selectable, and include also voltages low enough to not turn on pn junctions. This helps with in-circuit component measurements.
Price wise, you'll have to be clear on your value proposition.
I guess, you've seen that the pretty model ST5S/LCR Pro1 is 2 or 3 times expensive.
Well, I don't want to talk much about those product's shortcomings, they are more like DMM, here is a test and analysis post, you can get more details.
Have you ever seen an LCR Tweezers that could achieve 0.01% noise performance at that speed?
And look at the test image, we used 0.01% 2ppm precision resistors for the DUT.
We will post more details about the performance and structure design, it used as real precision tweezers, very easy to hold 0402 SMD components.
It is much more convenient to use than a stationary LCR meter, it could support SMD(independent or soldered on PCB) and through-hole components at the same time.
We have great confidence in it, you'll want to have a try
I guess, you've seen that the pretty model ST5S/LCR Pro1 is 2 or 3 times expensive.
Well, I don't want to talk much about those product's shortcomings, they are more like DMM, here is a test and analysis post, you can get more details.
Have you ever seen an LCR Tweezers that could achieve 0.01% noise performance at that speed?
And look at the test image, we used 0.01% 2ppm precision resistors for the DUT.
We will post more details about the performance and structure design, it used as real precision tweezers, very easy to hold 0402 SMD components.
It is much more convenient to use than a stationary LCR meter, it could support SMD(independent or soldered on PCB) and through-hole components at the same time.
We have great confidence in it, you'll want to have a try
The DT71 looks much more elegant and comfortable, the ST5S is unsightly. To use these tools as high-precision seems to me unwise. You can easily calibrate a demo sample and lose accuracy in mass production. If you ensure accuracy in mass production, it will be good. But we don't know that yet.
I didn't buy a DT71 for $50 and I won't buy yours for $100, it's expensive and more convenient for me to use a stationary device.
It is often very inconvenient to look at the tweezer readings when checking on the board due to the forced position of the tweezers. However, I suggest that you, as a friend function that will cure this deficiency: automatic locking readings. It works like this: if the measured value is stored for more than, for example, 2 seconds, issue a beep and record the readings so that you can turn the tweezers and look at the screen. Of course, the time and on/off of this function must be added to the settings.
Shannon
Do allow for display flipping so to cater for both right and left hand users.
Don't change the form factor as it's proven to be very functional and robust.
It would seem from the # of digits displayed great accuracy can be obtained however for a device of this type it robs valuable display real estate that might be better used to show some other user setting or measurement parameter.
Will your tweezers allow for user firmware updates ?