Author Topic: Lcr Tweezers  (Read 20621 times)

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Offline Ig_sherwoodTopic starter

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Re: Lcr Tweezers
« Reply #25 on: January 04, 2017, 04:44:56 pm »
CONFIRMED !!!
LCR Pro1 is the chinese clone of the genuine st5s .
 

Offline bingo600

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Re: Lcr Tweezers
« Reply #26 on: January 08, 2017, 03:59:33 pm »
I have this low cost version.

I have this too , and it does ok for my use.
Not POS for my use.

If i need better accuracy i just turn on my 34401A , or Mastech LCR.

But mostly i use it to verify/sort smd's when mixed by accident.



/Bingo
 

Offline LCR Research

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Re: Lcr Tweezers
« Reply #27 on: March 27, 2017, 01:26:44 am »
CONFIRMED !!!
LCR Pro1 is the chinese clone of the genuine st5s .
We, LCR Research, are a Canadian company proudly based in Toronto, Ontario. All research, development and manufacturing is also done in Canada. The LCR Pro1 provides 0.1% basic accuracy, 100kHz testing frequency, 2x larger display and wider measurement range. We are not “the Chinese clone of the genuine st5s”.

This conclusion that "the 100Khz frequency is virtually useless" is based on limited information. Here are some technical details to clarify the 100kHz performance question:

For 100kHz sinusoidal signal generation, the microprocessor’s DAC generate 10 points per period. Also, the DAC has 12-bit resolution and very stable time base set by 16MHz 10ppm crystal. The resulting signal has a THD (Total harmonics distortion) value less than 11%. To further reduce THD we use the 3-rd order low pass filter (not a 2-nd order one). This filter attenuates distortion by -60dB resulting in total THD value of less than 0.02%. This is more than enough to be used as an excitation signal in accurate LCR measurement. 

For the 100kHz sinusoidal signal processing we are doing 16 (not "8") samples per period. The 16 samples are used in generic formulas to calculate voltage and current amplitude and a relative phase shift. The 8 averaging samples are used to further improve accuracy. The proprietary software algorithms are used to enhance accuracy and measurement stability across full measurement range.

Regarding the 100KHz performance, please check out the attached pictures. The LCR Pro1 can measure small inductance in 100nH range accurately with 100KHz. This is not something a 10KHz device can do.

If you have any questions about our products, please contact us directly at sales@lcrresearch.com.
 
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Offline amspire

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Re: Lcr Tweezers
« Reply #28 on: March 27, 2017, 01:51:44 am »
How can it be a clone if it has an additional 100KHz capability, an extra digit of resolution, and I assume their own custom microcontroller code? To be a clone, it has to be a copy.

It is not as if Smart Tweezers invented how to do the measurements. They didn't invent SMD tweezers. They may have been the first to implement an LCR measurement intosmd tweezers, but there has been room for improvement (my SmartTweezers ST-AD model build quality is really bad). Why shouldn't other companies make competitive products?
 

Offline apelly

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Re: Lcr Tweezers
« Reply #29 on: March 27, 2017, 02:06:28 am »
POS, gave it to a customer.
Ouch. Bad customer?  ;D
 

Online tautech

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Re: Lcr Tweezers
« Reply #30 on: March 27, 2017, 03:44:47 am »
POS, gave it to a customer.
Ouch. Bad customer?  ;D
:)
After having had some Smart Tweezers for a few years, curiosity got the better of me as the Mastech units were so cheap. So to be honest they didn't live up to expectation after using a premium product so they'd still be on the shelf if not passed on.
He was thankful for them, that's all that really matters.
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Offline tigr

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Re: Lcr Tweezers
« Reply #31 on: May 19, 2017, 09:35:06 am »
100kHz testing frequency
Hi
Show an example of measuring a LOW ESR capacitor at 100kHz.
Samxon GA 3300uF/6,3v,Super Low Impedance,ESR 0,0065Ohm
« Last Edit: May 20, 2017, 10:33:51 pm by tigr »
 
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Offline nikifena

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Re: Lcr Tweezers
« Reply #32 on: May 26, 2017, 08:47:30 am »
Guys. Check this russian smart tweezer. It's hard to find it over the net because the site is in russian.
http://www.rlc-esr.ru/index.php/pintset-nv14

Looks pretty good with great price.
 
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Offline LCR Research

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Re: Lcr Tweezers
« Reply #33 on: August 18, 2017, 06:00:15 pm »
100kHz testing frequency
Show an example of measuring a LOW ESR capacitor at 100kHz.

Hi Tigr, please see attached picture for the capacitor ESR result and the capacitor specification. It was measured by a LCR Pro1 Plus device. We couldn't find the same capacitor you tested, but the polymer capacitor we tested is with ESR 30mohm max which is pretty low as well. As you can see from the picture, at 100kHz test frequency, the LCR Pro1 Plus got reading around 17mohm.
 

Offline tigr

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Re: Lcr Tweezers
« Reply #34 on: August 18, 2017, 10:19:43 pm »
Hi LCR Research,thanks.
And why not show the result of measuring this capacitor?
http://uk.farnell.com/panasonic-electronic-components/2sepc820my/cap-alu-elec-820uf-2-5v-rad/dp/2354628
If you have the opportunity to buy this capacitor, please measure the ESR at a frequency of 100kHz.
http://www.ebay.com/itm/16-pcs-0-5uF-250V-0-5-USSR-Military-K71-7-Polystyrene-capacitors-/201321663704
 

Offline LCR Research

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Re: Lcr Tweezers
« Reply #35 on: August 19, 2017, 03:54:35 am »
Hi Tigr, ESR is the resistance part of a capacitor. Therefore I selected the R mode and 100KHz test frequency to do the measurement according to the capacitor ESR specification. In order to measure capacitance accurately, it is required to set the test frequency properly. For a 100uF capacitor, we recommend to use 100Hz (or 120Hz) test frequency.
 

Offline tigr

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Re: Lcr Tweezers
« Reply #36 on: August 19, 2017, 07:34:04 am »
Hi LCR Research.
I'm interested in how your tweezers measure esr in the range 0-0.01Ohm. So I suggested to show the measurement result of esr of a polymer capacitor of 820uF at the frequency of 100 kHz indicated in the datasheet.
ESR-0,005Ohm(max.)
F-100-300kHz.
Instead of a polystyrene capacitor, please measure the ESR of a polypropylene capacitor at a frequency of 100 kHz (according to the datasheet).
ESR-0,0085Ohm
F-100kHz
http://eu.mouser.com/ProductDetail/Vishay-Roederstein/MKP1848580454K2/?qs=i2mp%2Fn9EmlKz7nmDvW1A5A%3D%3D
« Last Edit: August 19, 2017, 08:37:48 am by tigr »
 

Offline tigr

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Re: Lcr Tweezers
« Reply #37 on: August 21, 2017, 12:07:01 am »
 

Offline andyred

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Re: Lcr Tweezers
« Reply #38 on: April 23, 2018, 07:55:44 pm »
I for one tend not to trust companies which register their domain names under proxy registrant names like lcrresearch.com does. A serious company has nothing to hide, so the registrant could be a chinese company in this case until proven otherwise.
 
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Offline xzswq21

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Re: Lcr Tweezers
« Reply #39 on: November 23, 2018, 04:37:57 pm »
I want to buy a SMD tester. which one is better?

1-LCR research Pro 1 plus
2-SMART tweezer ST5S (with Bluetooth)
3- APPA 1707
https://uk.rs-online.com/web/p/lcr-meter-accessories/1238652/
4-http://www.rlc-esr.ru/index.php/pintset-nv14

I have been working with RF inductors such as 12nH from CoilCraft and low ESR capacitors and I should measure a very small capacitors such as 0.7pF to 1.6pF ....

Thanks
« Last Edit: November 23, 2018, 04:42:17 pm by xzswq21 »
❤ ❤
 

Offline Free_WiFi

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Re: Lcr Tweezers
« Reply #40 on: January 30, 2019, 05:32:02 am »
I want to buy a SMD tester. which one is better?

1-LCR research Pro 1 plus
2-SMART tweezer ST5S (with Bluetooth)
3- APPA 1707
https://uk.rs-online.com/web/p/lcr-meter-accessories/1238652/
4-http://www.rlc-esr.ru/index.php/pintset-nv14

I have been working with RF inductors such as 12nH from CoilCraft and low ESR capacitors and I should measure a very small capacitors such as 0.7pF to 1.6pF ....

Thanks

https://www.ebay.co.uk/itm/Auto-LCR-Digital-Electric-Bridge-Resistance-Capacitance-Inductance-ESR-Meter-NEW/181367473225?hash=item2a3a580449:g:q3AAAOSwH09ZEpjZ
 

Offline Doctorandus_P

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Re: Lcr Tweezers
« Reply #41 on: January 30, 2019, 08:40:50 am »
I have a cheap Mastech MS8910 mostly for verifying the values of new SMD resistors and capacitors, and it works good enough for me. Inductor measurement would have been a nice extra though.

For my next meter I'd also much rather have the DE-5000 then a LCR tweezer.
I do not care much for it's bight yellow but it may make it easier to find it between all the clutter on my desk.
 

Offline beanflying

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Re: Lcr Tweezers
« Reply #42 on: January 30, 2019, 08:48:14 am »
You are missing one of the features of the better tweezers you can do in circuit testing. I just went through the process but I still haven't ruled out buying a DE-5000 as well.

Still coming to some conclusions on two of the Canadian offerings as I have a set of LCR Research and a set of Smart Tweezers to play with and am working out the good an bad of both.

Edit Thread here https://www.eevblog.com/forum/testgear/truth-about-canadian-lcr-tweezer-manufacturers/msg2068102/#msg2068102
« Last Edit: January 30, 2019, 08:54:25 am by beanflying »
Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 


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