Description

LD25/LD35 USB Interface Electronic Load Resistor Discharge Battery Test LED Display Fan Adjustable Current Voltage 25W

Product Model	LD25	LD35
Rated operational voltage	DC4-25.0V
Max discharging power	25W	35W
Rated operational current	0.25-4.00A (when fan don’t work, the minimum constant current is 0.05A )	0.25-5.00A (when fan don’t work, the minimum constant current is 0.05A )
Fan Speed	Oil bearing intelligent temperature control fan，speed 5800±10%RPM	Hydraulic bearing intelligent temperature control fan，speed 8000±10%RPM
Application	Application suggestions: Charger, power supply and other device manufacturers want long-term discharge or batch aging test of products, please choose LD35 (LD25 is not applicable)
Constant current accuracy	±（2％+3 digits）
Constant voltage accuracy	±（2％+3 digits）
Heat dispatch method	Intelligent temperature control fan + All aluminum fan
Working temperature	-10℃-40℃
Adjustable potentiometer	Precision multiloop adjustable potentiometer
Display mode	4 bit LED tube
Expansion port	Micro USB port、Type-C port
Product weight	About 57g
Product size	84x41x28mm

1  *  LD25/LD35 USB Interface Electronic Load Resistor Discharge Battery Test LED Display Fan Adjustable Current Voltage 25W/35W

Product Structure:

A. Micro USB port：MAX current 2A

B.USB male port (widened power wire，MAX current 4A）

C. Type-C port：MAX current 4A

D. All aluminum fan

E. Intelligent temperature control fan

F. 4 Bit LED tube

G. Precision multiloop adjustable potentiometer

H. “SET” button：press “SET” to switch display status, Press and hold the button to set the load output recovery mode after protection removed. 

I. “ON/OFF” button: press the button to open or close output. Press and hold the button to set the boot default status of open or close

Function Introduction:

a. Protection function:

OVP (over-voltage protection): there is OVP at 25-30V; it will be damaged permanently over 30V.at OVP, LED show OVP, as picture 1 show)

OTP(over-temperature protection): load temperature is over  80℃, the LED show OTP, as picture 2 show.

OPP(over-power protection): the power is over  80℃, the LED show OPP, as picture 3 show.

b. Set output recovery mode after load entering protection status, manual or automatic

c. View the voltage value, current value and power value of the load. 

d. Intelligent temperature control fan. When the current is over 2A or the temperature is over 40℃, the fan will start.

e. Precision multiloop adjustable potentiometer: you can adjust the current precisely, upto 0.01A. so you don’t need to adjust a big current mistakenly to damage the power supply. So the power supply will not be damaged due to mistakenly adjustment

f. you can set default boot status freely, open or close.

Operation Instruction:

The load is powered at the range of 4-25.0V (the input polarity cannot be reversed, otherwise the product is permanently damaged and cannot be repaired), the LED will be flashing to remind current setting value, waiting for output. Press ON/OFF button, open output to start work.

1. Adjust output current value.

  Turning the rotary control clockwise increases the value and anticlockwise decreases the value. According to the needs of the situation, the potentiometer can realize coarse adjustment or fine adjustment. The fine adjustment can be accurate to 0.01A.

2, Adjust LED display status

Press “SET” to adjust the LED display status, default display output current value. Press “SET” button to display *.**A、**.*P、**.*V followed by recycling.

3. Open or close load output

  Press “ON/OFF” button, you can open or close load output

4, Set load default boot status (open or close status, Factory default close status)

  

Press and hold “ON/OFF” button to set load default boot status freely. Press and hold “ON/OFF” button, if the LED will display “--ON”, as picture 4, the load will open output when power on next time; If the LED display”-OFF”, as picture 5 show, the LED will display current value flashing at last shutdown when power on next time, then press “ON/OFF” button to open output.

5, Set the load output recovery mode after protection removed.

Press and hold “SET” button, to set output recovery mode after protection removed. Press and hold “SET” button, if the LED will display “--ON”, as picture 4, and the protection was removed, the load will recover to work; If the LED display”-OFF”, as picture 5 show, and the protection was removed, the LED still show protection status, then press “ON/OFF ‘button, the display will display present setting current flashing, then press “ON/OFF‘ button again, the load recover to work. 

NOTE:  Please check the output current of power bank carefully. The current of the general power bank is generally small, so adjust smaller current when the load was used.

Application:

Assist to measure Micro USB cable good or not

Assist to measure Type-C cable good or not

Assist to measure output current capacity of charger good or not

The usage of large batch ageing test at the charger factory