USB meter: QC2-3-MTK-PE Trigger J7-t

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Official specifications:
I found this unit on Aliexpress at a dealer called honestycentre.



How does it look

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The button has multiple functions:
A long press will change between QC2, QC3 and MTK-PE
In QC2: A short press will change between 5V, 9V, 12V and 20V, a double presss will cycle automatic between modes.
In QC3: A short press will decrease voltage, a double presss will increase voltage.
In MTK-PE: Same as QC3, also be aware that this requires a load on the output to work.

5 fast presses will reset the Ah, mH and time counters.
Holding the button down when connecting power will enter the configuration and calibration menu.

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The two QuickCharge screens

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And the MTK PE screen

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I could break it open without any damage.

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This design looks very simple. It has a voltage regulator, a R050 for current measurement, a processor and some transistors for turning the output on/off. The missing 6 pins chips are probably ADC's with better resolution, the missing 8 pin chip is a EEPROM.

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Measurements

Test

This device requires nearly 4 volt to work fully, this will affect the precision at low voltage including QC3 when at lowest voltage. When the voltage is 4 volt or above the precision is good.


Temp3380

M1: 43,9C, M2: 51,9C, M3: 49,2C, HS1: 57,0C


Temp3381

M1: 49,2C, M2: 46,6C, HS1: 61,1C



Conclusion

This is useful as test equipment, but do not use it between a charger and a phone or pad, it will probably burn the phone/pad.
Together with an external load it can be used to test different types of fast chargers including power banks, but it cannot be used for much else.



Notes

How do I make the test