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USB Data Line Copper Inspection Standard
Apr 17, 2018

What is the wire of the USB data cable? Of course, it is composed of a PVC cover and an important copper wire. Therefore, when we examine the wire, we pay special attention to the inspection of the copper wire, because the quality of the copper wire often determines the quality of a USB data cable. Therefore, we strictly test its quality. The specific inspection criteria must be strictly followed the following steps:

First, the appearance of the test: the spool filled with copper wire should be placed on the packaging platform, with a hand to hold a white paper placed 1-2cm away from the copper wire, the other hand will be the spool of copper wire Scroll a week to visually determine if the appearance meets the following criteria:

1) Smooth surface, no black lines, no messy lines, no pockmarks, no oxidation, no scratches, no scratches, no tinning (tin soldering, tin leakage), no slashes, no hands, No fingerprints.

2) The cable is good, even, no hemming, undershoot (edge high or low on both sides), no stocks.

3) Moderate tension is not too loose or too tight.

4) No sticky ash on the surface of the copper wire after rolling (overfilled)

Second, wire diameter inspection: wire diameter in accordance with national standards, customers have special requirements when they strictly control their requirements. The specific inspection steps are as follows:

1) First test whether the micrometer is zeroed.

2) Put the copper wire to be tested out of the micrometer clip line, and use appropriate force (the force must not be too heavy or too light) to twist the tip of the micrometer.

3) When you hear three sounds of a micrometer you can observe its readings.

4), should be repeated so that two or three readings can be consistent (the same copper wire) can not detect the same position each time, should be tested in sections.

5) Copper wires with diameters above 0.2 cm are used to inspect different interfaces of copper wires so as to avoid flat wires.

Copper wire

Third, the elongation test: elongation in accordance with national standards, the customer has special requirements, in accordance with its strict control, the specific steps are as follows:

1) Open the switch of the elongation tester.

2) Observe whether the clamp on the left side is in the original position and whether the reading displayed by the instrument is zero. If the left side sensor clip is not in the original position, the reading displayed by the instrument is not zero, and the restore key and zero key should be immediately pressed.

3) Gently open the clamp, put one end of the copper wire to be tested into the inductive clamp, press down the inductive clamp, then gently straighten the copper wire and place the other end into another inductive clamp, and press down the inductive clamp Hold the copper wire firmly and press the test button.

 4) After the induction clamp pulls the copper wire off and stops moving, observe the displayed reading as the elongation of the copper wire tested.

Fourth, the resistivity test: resistivity requirements in accordance with national standards specific inspection steps are as follows:

1) Turn on the power switch of the resistivity tester.

2) Clip the two sides of the sensor clips to see if their reading is zero.

3) If the reading displayed by the instrument is 0, take the length of the copper wire to be inspected and take a length of 1m and clamp the two ends of the copper wire with two inductive clamps respectively. The detected copper wire must not come in contact with any metal objects. Press the test. key.

4) Observe the readings and take the readings to calculate the resistivity. The calculation method is as follows: Resistivity = Reading* 0.7854* Room Temperature Coefficient/1000 5. After the inspection is completed according to the above steps, pass the QC chapter. Round copper wire type: TR ----- soft round copper wire TY----- hard round copper wire TXR ----- tinned soft round copper wire TYT ----- special hard round copper wire TXRH- ---- Solderable tinned soft round copper wire