0.0 Versions and Updates  
As instrument products have many functions and frequent software and  
hardware updates, the manual may be updated at any time, please be aware.  
Please get the latest update information on the official website.  
1.0 Overview  
The FNB48USB tester is a high-reliability, high-safety USB voltage and  
current detection meter and a mobile communication terminal fast charging  
trigger. It has a 1.77-inch TFTLCD display and integrated USB-A, Micro-USB,  
Type-C interfaces. Use external 16-bit ADC, PD protocol physical chip. It  
can be used to measure the power supply or power consumption of products  
such as USB interfaces, mobile phone chargers, U disks, etc.; it can be used  
to measure mobile phone charging power and mobile power input and output  
conditions; it can be used for charger fast charging protocol testing.  
This instruction manual includes relevant safety information, warning  
tips and solutions to common abnormal situations. Please read the relevant  
content carefully and strictly abide by all warnings and precautions.  
2.0 Safety Precautions  
1 Do not connect the monitoring interface to a power supply exceeding 24V;  
2 Do not connect the PC connection port to a power source exceeding 16V;  
3 Only one pair of monitoring interfaces (one input port, one output  
port) can work at the same time. When there is a pair of monitoring  
interfaces working, it is forbidden to connect to the equipment on  
other monitoring interfaces. (Except the PC connection port, the PC  
port can be connected to an external power supply)  
4 When using the fast charge trigger module, please do not connect  
equipment that cannot withstand high voltage to any monitoring interface;  
5 After using the PD trigger/monitor/conversion/read E-Marker cable  
function, please turn the PD communication switch in the lower right  
corner back to the OFF position;  
6 When working at high power,The temperature of the instrument rises,Please  
be careful,Prevent burns  
7 Do not charge the phone after the fast charge is triggered,Therefore,  
the phone is damaged, The manufacturer is not responsible.  
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