Products > Test Equipment

LCR Tweezers test and analysis (HP-990, DT71, ST5S...)

<< < (11/13) > >>

Shannon:

--- Quote from: bateau020 on February 16, 2021, 03:59:58 pm ---
--- Quote from: Shannon on February 16, 2021, 03:14:02 pm ---Some high-precision Wheatstone bridges use AC excitation to avoid low-frequency noise.

But if power consumption and temperature rising of large current are acceptable, DC large current is a more easy choice.

--- End quote ---

Depends on the use case.
If you want to find a short on circuit board, you will need to do it in DC or a low frequency. Otherwise you will measure the caps, plus the board layout will add inductance, so you will be mislead. Just keep the voltage low enough to no to fry components. Well, you could go fancy and test through pulsed excitation, but then you are in the area of the higher end tools.
If you have 1 component that you want to test, then AC could be better.

By the way, for testing on boards in the milli-ohm range it is best to avoid tweezers: contact surface and pressure have too much influence on the measurement, and are relatively hard to control with tweezers. Use pointy kelvin probes, and they are hard to find (the battery test kelvin probes are easy to find, but they are way too large). For those who want to see how its done, look what Robrenz did. Deep respect for his skills.

--- End quote ---

Shocked me, Deep Respect!

Shannon:

--- Quote from: serg-el on February 16, 2021, 08:05:41 pm ---
I already wrote earlier in another topic, and attached photographs. 
Kelvin probes with a short distance are easy enough to make from felt-tip pens and sewing needles. 
Shielded wires.  Closed relay contacts and tracks between contacts are clearly distinguished on the boards.
  Relay resistance is higher;)
And my tweezers are HB-1.  The first of the HB series.  We have already written about them above in the topic.  (NV-14, NV-15).





--- End quote ---

Your design is very creative :-+

Do you use the sewing needle to make the probe?
What a smart choice!

Shannon:

--- Quote from: fabriciofx on February 16, 2021, 09:55:14 pm ---Shannon,

Please, can youy let me know when you start sell it?

Best Regards.

--- End quote ---

Hi fabriciofx,

We have conducted many experiments, but we still attempt to get more ideas and help to make it better or make it true.

We are experienced in how to design a product, but we have few ideas on how to sell :palm:

Some guys recommend Kickstarter to me, is Kickstarter convenient for you?

Regards

tautech:
Be aware you will need to compete with the Mastech MS8911 if you are to enter the low cost SMD tweezer market.

Shannon:

--- Quote from: tautech on February 17, 2021, 03:06:39 am ---Be aware you will need to compete with the Mastech MS8911 if you are to enter the low cost SMD tweezer market.

--- End quote ---

Hi tautech,

Really appreciate your reminding

If we try to make it true, our goal is that the performance is no worse than st5s, and the test results give us confidence at present  ;)

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod