Such as: enameled wire pinhole detector JJ-520A, the instrument detection range (nominal diameter
d): 0.018 ≤ d ≤ 5mm, test voltage: DC12/24V ± 0.1V. according to the company's needs to purchase the instrument.
Two, saline pinhole test method:
Methods: Prepare the following raw materials, a large beaker with a scale (transparent long body container can also be), water, salt (a small amount), alcohol (a small amount), phenolphthalein, DC power supply (including power cord and wire clips).
Steps: 1, take 6m long copper wire to be tested, coiled into a ring or rectangular shape can be, each of the two ends of the reserve each about 0.5m, and will be dipped in tin about 20mm.
2, the proportion of the solution: 0.2% brine plus 3% phenolphthalein solution;
Methods: A: 0.2% brine, such as: 99.8g of water plus 2g salt;
B: 3% phenolphthalein solution, e.g., 20g of pure alcohol with 6g of phenolphthalein.
3, about 5 meters of copper wire into the test solution, add 12V
DC voltage on both ends of the line header, observe the copper wire in the solution, the pinhole due to leakage of copper wire will be electrolyzed to make the solution red (phenolphthalein's role).
4, carefully count the number of places, that is, a few pinhole, pinhole how many can check the relevant data table control.
Note: 1, nominal 0.063mm above the enameled wire, take 6m samples; nominal 0.063 mm below the enameled wire, take 1.5m samples can be.
2, the general number of pinholes in the 7PCS, according to the national standard and enterprise standard combination of inspection.
Principle: Due to the ionization of water, there is a chemical reaction in the vicinity of the metal, producing alkaline substances.
Disadvantage: The negative electrode will rust quickly due to strong oxidation. It is recommended not to throw the power negative electrode directly into the test solution, it is better to connect a conductive metal object.