USB meter: KCX-017

DSC_7472

Official specifications:
I found this unit on Ebay at a dealer called missjun2010



How does it look

DSC_7497
DSC_7495

DSC_7473

The button is used to select memory with:
One long click: Select next memory and clear it.
Double click: Enter view mode.
Click in view mode: Show next memory.

DSC_7474 DSC_7475

The device has the usual usb connector for input, but also a micro usb connector that can be used directly with any standard usb charger.

DSC_7483


DSC_7826

I could just pry it open.

DSC_7827

On the topside there is only the LCD display with a background light and a switch.

DSC_7828

On the bottom there is a PIC microcontroller, a HOLTEK LCD controller, a opamp and two 50mOhm resistors in parallel, i.e. 25mOhm resistance.
This is a very nice low resistance, but is partially spoiled by the cable.

DSC_7829
DSC_7830
DSC_7831
DSC_7832



Measurements

Test


Temp1355

M1: 32,9C, M2: 38,1C, M3: 39,7C, HS1: 49,0C

There is nothing in the device that gets hot.

Temp1356

M1: 34,4C, M2: 35,1C, HS1: 42,1C



Conclusion

I am not very impressed with the memory feature, but it can be ignored. The current display is fairly accurate and it has an acceptable resistance.
I will call it a good usb meter.



Notes

How do I make the test