HangZhou RuiDeng Technologies Co., Ltd
order to quickly discharge the power of the power bank. Test with a constant current load. Take
xiaomi power bankII as an example, it can support 5V/2A output, 38.5Wh/(5V*2A)=3.85. It can
discharge the power of power bank in about 4 hours. If you use HD35 electronic load, it can be
triggered 9V. Thus 18W quick discharge, 38.5Wh / (9V * 2A) = 2.13h, so that it takes only two
hours to complete the power bank capacity test, quickly identify whether the capacity of power
bank is false (high power discharge, inversion rate will decrease and the actual measured
capacity will be smaller).
II. Measuring the quality of data cable
The quality of the data cable directly affects the speed of charging, even worse the inferior
data cable has the risk of burning the phone, so measuring the quality of the data cable is also
a necessary function. We have two ways to measure the quality of the data cables, each with
its own advantages and disadvantages, you can choose the better way which suits you .
The common data cable length has a great influence on the actual test results. Generally
speaking, the shorter cable ‘s performance should be better.
1. Current measurement method:
Test materials: mobile phone, original charger, original data cable, USB tester, data cable to
be tested.
Test procedure: Discharge the phone to between 50% and 60% power. Use the original
charger, USB tester and original data cable to measure the charging current and record this
current. Then replace the original data cable with the data cable to be tested, and record the
charging current again. The time between the two measurements should not be too long. The
higher the charging current, the better the quality of the line. If the charging current values
differ a lot, it may indicate that the quality of the cable is very bad or the mobile phone is not
supported to the cable(Note: you must use UM25 to test Huawei Super Quick Charge).
2.Cable resistance measurement method:
Test materials: charger, UM series tester, constant current load (such as HD35), data cable
to be tested.
Test procedure: Insert the tester into the charger,switch to the line resistance measurement
interface, plug in the load, adjust the current to about 1A, hold the button and wait for the tester
to flash, then remove the tester.
Connect the data cable. Plug it into the charger, plug the other end of the data cable into the
tester input, turn on the load, and hold the button. The resistance of this cable will be displayed
on the tester.
Advantages of current measurement method: It can intuitively judge whether the data cable
supports the fast charge and fast charge current value, and you only need to buy a USB tester.
Disadvantages of current measurement method: relying on mobile phones and original
accessories of the phone as a comparison.
Advantages of line resistance measurement: It is possible to measure the actual parameters
for comparison between different wires. Generally, the micro data line resistance will be above
400mΩ, and the Type-C data line can be made smaller. No need to use a mobile phone for
measurements
Disadvantages of line resistance measurement: the tester and load are required to measure,
and the price is higher.
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