Fortunately, I got a chance to test again, but this time it is a smart fast-filled Rubik's cube. Since it is a smart socket with USB, it must be able to perfect the test can not ignore the USB output current, using ammeters and the like too much trouble, So think of a simple tool, USB voltage and current detector. Then there is this sun bill!
Taobao searched for a bit, similar gadgets really a lot, concentrated in the white tail and this gray shell, there are several specifications, and finally chose the KWS-V21 USB voltage and current detector.
Shun also bought a load test resistor for 1A2A manual switching, very cheap, 25.8 get!
Plastic packaging, only support USB2.0 this is enough, on the packaging support QC2.0 fast charge, but the seller description should be able to support QC3.0
Behind are detailed parameters and simple instructions
Workmanship is OK, mold opening is relatively fine, there are no uneven seams and plastic glitches
The whole is the upper and lower halves of the plastic shell, there are four buckles in the left and right corners, there is no screw
Insert the nails from the seams, it is easy to open the shell
To a collection of upper and lower shells, plus the middle of the body, there is a recovery button.
The front of the main body is a LCD panel
The back is also very simple. All are original patches. There is a chip, but the surface seems to be polished. There is no logo. There is a large amount of vinyl in the middle.
From another point of view, we can see the surface of the chip to see if someone is tempted to polish the chip. It is estimated that it is still out of technical protection.
Then take a look at the USB charging current detection switch with switch, this simple, two discharge resistors, plus a switch, a light-emitting diode and a small resistance, complete the entire collocation
A large piece of heat is used on the back side, solder joints are relatively fine.
The USB port of the laptop is conveniently inserted, and the end mouse is an ordinary mouse. Haha, the accuracy should be good, the output voltage is 5.08V, the current is between 0.000A and 0.002A, and the total power consumption is 2mah in 12 minutes.
Test charging head, QC2.0 comes with Xiaomi 4 support 5v/9v/12v automatic switching
Output voltage is 5.09V under no-load condition
Test the resistance first, switch to 1A load state, output voltage 5.15V current 1.01A
Then 2A current test, switch, the voltage slightly increased the point, the current rose from 1.01A to 2.02A, it seems millet's charging head is a sufficient amount of 2A output, or good. Did not dare to measure too long, because the resistance will heat.
Plug in the millet phone 4, the voltage jumps to 8.95v current is 0.45A, no further, ready to handle the mechanical and electrical exhausted once again, so you can calculate the battery capacity.
First come SONY's NWZ-WS615/W to see how much battery capacity. This Bluetooth headset is mainly used to buy swimming time. Now it has been used for 1 year. After the daily use of the Bluetooth, the continuous playing time of the connected mobile phone is only about 4 hours. The specific data can take a look at the previous drying order: a tool to kill dry sports. :SONY Sony wearable sports waterproof headphones mp3 player NWZ-WS615/W
Just plugged in without charging current
Less than 1 second, the current has, 0.39A
1 minute charge 6mAh, this and the headset 3 minutes fast charge feels a certain gap, do 18mAh power can support for a long time? Or need a dedicated charger?
After 22 minutes, the charge current dropped to 0.17 A, at which time the charge reached 121 mAh.
Regardless of it, after 3 hours and 13 minutes, it has stopped charging, and at this time, it shows that the power consumption is 200mAh. It is estimated that this is the capacity of the headset battery. Actually it should be even smaller! At this time, the power consumption of the mobile phone was almost the same, and it finally shut down automatically.
Press Clear Data to clear the last recorded data and restart
Just inserted, voltage display 8.96v, charge current 0.43A
After 1 minute, the current reaches 1.12A. At this time, the battery shows 1% of the power, and the actual power consumption is 11mAh.
After 54 minutes, the charge current dropped to 0.71A, the battery power of the mobile phone showed 55%, and the actual consumption was 930mAh.
In the middle of the night, the mobile phone has shown 100%, the charging voltage has dropped to 5.12V, and the current has 0.57A, indicating that the overall power consumption is 1708mAh. It is estimated that this is the actual capacity of the Xiaomi 4 battery that is used for almost two years. And millet 4 nominal 3080mAh almost dropped by half, it seems that is almost the change.
Tester comes with the skills, data is saved after power off
Powering on again will continue with the previous record, which is very good. However, when you need to test a new USB device or charging head, you need to press the Clear key manually to reset it.
There is also a practical function, this is a Bluetooth alarm clock speaker that was previously bought for my father, because it can't be completely charged for a long time, and it is said that charging doesn't work, so I used it to test it. There was really no charging current. It was only about 0.01, but it was plugged in and it was not charged. In about 10 minutes, the charging current finally appeared. About 0.42A, with this one can intuitively see if the device can be powered on, it is still quite good. Of course, he can also test the capacity of the charging treasure by inserting it on the charging treasure and inserting a load to discharge or charge the other equipment. The actual capacity of the battery can be known based on the final calculation of the amount of electricity consumed. This small and easy to use is still quite good!
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