solution : how to judge the micro and type-c cable quality

solution : how to judge the micro and type-c cable quality
Posted by RD Tech on 19 Jun, 2018 09:30
UM25(C) Measure Type-C and Micro cable resistance same with UM24(C) and UM34(C))

Use our tester to measure the cable resistance to judge the cable resistance good or not , it is very useful
Measurement procedure:
First, connect the USB Tester directly to the power supply and adjust the appropriate load current (recommended value 1A). Press and hold the "Next" button to begin recording data. The indicator prompt will stop flashing.
Second, unplug the USB Tester and then reconnect it to the power supply via the data connection cable and adjust the load current to the same value as in the first step. Press and hold the "Next" button to begin recording data. The indicator prompt stops flashing and the Data Connection Cable resistance measurement test is completed and the value displayed.
Note: If during the second step the screen turns black, this indicates that the voltage difference is too high and the tester will enter the 4.5V power-down state. The load current needs to be reduced. Then re-start the measurement from the first step. After the Data Connection Cable resistance test is completed, the Tester needs to be powered off and then on again to resume measurement.
UM24(C):https://www.aliexpress.com/store/product/RD-UM24-UM24C-for-APP-USB-2-0-LCD-Display-Voltmeter-ammeter-battery-charge-voltage-current/923042_32845522857.html
UM34(C): https://www.aliexpress.com/store/product/RD-UM34-UM34C-for-APP-USB-3-0-Type-C-DC-Voltmeter-ammeter-voltage-current-meter/923042_32880908871.html
UM25(C): https://www.aliexpress.com/store/product/RD-UM25-UM25C-for-APP-USB-2-0-Type-C-LCD-Voltmeter-ammeter-voltage-current-meter/923042_32855845265.html
LD25: https://www.aliexpress.com/store/product/RD-LD25-Electronic-Load-resistor-USB-Interface-Discharge-battery-test-LED-display-fan-adjustable-current-voltage/923042_32882318330.html

#1 Reply
Posted by anishkgt on 19 Jun, 2018 09:34
Sad these don't have an app for the IOS.

#2 Reply
Posted by Ian.M on 19 Jun, 2018 10:11
Personally, I'd rather use a bench multimeter + a set of breakout boards for all the sizes of USB A and B socket. That also lets you check the shield resistance is under 0.6 ohms, and the data pair resistance to confirm they are at least 28 AWG. If its got good low L and C ranges, you can also check if the data pair impedance is close to the 90 ohm spec.

High shield resistance or out of spec data pairs are key signs of a crappy cable that wont be picked up by testing the power pair resistance or voltage drop in circuit.