Products > Test Equipment
LCR Tweezers test and analysis (HP-990, DT71, ST5S...)
2N3055:
--- Quote from: indman on February 15, 2021, 10:20:45 am ---bateau020,there is no noise on your video, but a random number generator in the last 2 bits. ;)
Can you measure the resistance with 10-20 milliohms with your tweezers?
--- End quote ---
Noise IS the random number generator, the original one... ^-^
You can measure miliohms, but it won't be as stable as dedicated miliohm meter and kelvin clips.
You will never have stable milliohms on a tweezer with contact surface of fraction of millimetre square, and hand regulated pressure.
You need clips with bigger contact surface area and spring to achieve semi stable and repeatable pressure.
indman:
--- Quote from: 2N3055 on February 15, 2021, 11:46:51 am ---You can measure miliohms, but it won't be as stable as dedicated miliohm meter and kelvin clips.
You will never have stable milliohms on a tweezer with contact surface of fraction of millimetre square, and hand regulated pressure.
You need clips with bigger contact surface area and spring to achieve semi stable and repeatable pressure.
--- End quote ---
Do you have such devices that you listed? Did the manufacturer of this tweezers put these extra contacts in the kit with the device? Otherwise, what are these 2 additional unstable digits? Indicator? Marketing? ;)
2N3055:
--- Quote from: indman on February 15, 2021, 12:05:51 pm ---
--- Quote from: 2N3055 on February 15, 2021, 11:46:51 am ---You can measure miliohms, but it won't be as stable as dedicated miliohm meter and kelvin clips.
You will never have stable milliohms on a tweezer with contact surface of fraction of millimetre square, and hand regulated pressure.
You need clips with bigger contact surface area and spring to achieve semi stable and repeatable pressure.
--- End quote ---
Do you have such devices that you listed? Did the manufacturer of this tweezers put these extra contacts in the kit with the device? Otherwise, what are these 2 additional unstable digits? Indicator? Marketing? ;)
--- End quote ---
I will try to explain this gently, because I know sometimes it is hard to express yourself in foreign language.
Your tone fells sarcastic and not very nice and I am not certain what do you want with all these questions.
I don't know if that is intentional or you just struggle to find proper words in foreign language.
I didn't make those tweezers and have no idea why manufacturers implemented so many decimals when they are not even necessary.
In datasheet they specify all technical specifications, and device certainly perform better than specified..
I personally would like if they would have less digits because it is not useful or accurate to displayed number..
But I got used to it, know how to read what I want and I don't care. It doesn't make it less good or useful, although I agree with you that it is silly.
As I said I didn't make those tweezers and have no connection to manufacturer whatsoever. I speak from my own experience and I paid for it with my own money.
If I had a chance to buy better tweezers for half the money, I would buy it gladly....
If you know the better, cheaper, ones, please share with us... I'm interested.
Regards,
bateau020:
In theory it is possible to equip these tweezers (and the LCR Reader, the ST5S, and probably others) with 4W kelvin probes. See the attached image.
But you cannot simply buy them. The makers of the "LCR-Reader" have an extension cable that extends one end of the tweezers, via a kelvin cable (LCR-PC). But it ends in a simple probe again. Therefore: same problem.
There is a big reason you will not see milliohm measurements for this type of instrument: it requires larger currents if you want more precision. So even if possible, you would eat batteries like crazy.
Just use a dedicated instrument. Even my DE-5000 clone with 4W kelvin clips is not what I use for milliohm measurements. I just pump large currents through it and measure it the hard way, with 2 multimeters. But you could also get a good bench MM.
indman:
--- Quote from: 2N3055 on February 15, 2021, 12:59:26 pm ---I personally would like if they would have less digits because it is not useful or accurate to displayed number..
But I got used to it, know how to read what I want and I don't care. It doesn't make it less good or useful, although I agree with you that it is silly.
--- End quote ---
I also agree with you and did not want to offend you as the owner of this device. But I am critical of when a manufacturer (seller) for marketing purposes
does stupid things that customers don't need.
I know of a few really serious tweezers that are worth the cost, like the HB-14 or the newer HB-15.
But I don't know if these tweezers are sold in your countries, since the author and manufacturer of these devices is from Russia.
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