Buck LM2596 Step-down Power Convert Module DC 4.0~40 to 1.3-37V Voltmeter
Input voltage range:4-40VDC
Output voltage range:1.25-37DC adjustable
Output current:2A Voltmeter range:0 to 40V,error +-0.1V
Input reverse polarity protection
Short protection function
Thermal shut down function
L x W x H=6.1 x 3.4 x12cm(approx.)
LED digital voltmeter tube,the accuracy is adjustable function,can be aimed at your multimeter adjustable accurate
Press the right key to let the dispaly show the input or output voltage.when the right "OUT" led is light, it shows output, the left "in" led show input
Output voltage calibration steps:
Step 1, adjust the right button so that "OUT" LED lighted, the voltmeter shows the
value of output voltage; Press the right button for more than 2 seconds, release,
voltmeter and "OUT" LED flashes in synchronization so that you enter the output
voltage calibration mode.
Step 2, press the right button (normal speed), the voltage value is adding up a unit;
Press the left button, minus a unit; Due to a unit is less than 0.1V, the minimum
voltage display to 0.1V, so you need to continuously press 1-5 times to see the
voltmeter change 0.1V, how many times voltmeter change 0.1V by pressing the key,
depending on the current display voltage, the higher the voltage, the fewer the
number of press.
Step 3, press the right button for more than 2 seconds, release, to exit the output
voltage calibration mode. All parameters set to automatically power down to save.
Input voltage calibration steps
Step 1, adjust the right button so that "IN" LED lighted, the voltmeter shows
the value of input voltage; press the right button for more than 2 seconds,
release, voltmeter and "IN" LED flashes in synchronization so that you enter
the input voltage calibration mode.
Steps 2 and 3, consistent with the output voltage calibration method.
If the module can not be adjusted, that is, the output voltage is always equal to the
input voltage rotate counterclockwise the potentiometer 10 turns or more, then try to
adjust the output voltage. The factory default output voltage is 20V.