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ESR meter with extended scale.

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It is very important to know the ESR value of capacitors in any connection without removing them from the board. Also, searching for documentation on them does not always lead to success. Therefore, we can now trust our calibrated scale, which naturally speeds up the work.
We must ensure that the capacitor is suitable for further use in our projects without removing it from the board.

In my work, sometimes it is necessary to make measurements with high accuracy, and to do it quickly and as efficiently as possible. Some things have to be done directly on the boards, without desoldering the components.
Therefore, we studied the issue of purchasing a second tweezers with higher characteristics. In the end, I chose the LCR Pro1 Plus.
In addition, I naturally wanted to check the measurement results with my 100 kHz tweezers. The results delighted me, which means my time was not wasted.

I used digital tweezers to measure the resistance of the smd fuse and the esr of two 220 uF SP-CAP capacitors connected in parallel. Naturally, good contact is needed and this is provided by high-quality tips. I would even make the tips even more rigid, because sometimes sufficient effort is needed to obtain a reliable result.
I also measured a capacitor from Panasonic SP-Cap GY 820 uF.

Made a slight upgrade to my tweezers.
With the same dimensions, the new board added a connector for external power. The microswitch is half the size and is used when powered by batteries.
All resistors, except the power bus, have a 1% tolerance. The 1nF capacitor was selected for the lowest losses.
Resistors R5, R6 0.1 Ohms were replaced with smd ones. The freed up space can be used for ferite rings of larger diameter.

The second tweezers are made a little differently. Of course, you can buy ready-made gold-plated tips, but this greatly increases the cost of the design. In the process of working with two tweezers, I decided to try to make my own tips from available materials. I experimented with different materials, but in the end I chose copper plates.
The tips must be thin enough, while maintaining good rigidity and stability and have low resistance. Copper plates are perfect for these requirements. The only possible inconvenience is sometimes rubbing the surfaces with fine emery cloth. As you know, copper also comes in different qualities, so it is necessary to use plates well-known manufacturers, such as flexible multi-plate electrical busbars.
Another significant difference from the first tweezers is the distance between the tips. 2 cm and 4.5 cm, respectively. This allows you to measure capacitors of different types with radial leads.
In addition, having a low-impedance range, it is more convenient to look for short circuits on boards at more distant points.


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