Product Introduction:
1. Power Supply Voltage: 7-36V
2. After power on, D2 lamp should be on; if not, please check the connection. The board has reverse connection
  protection function.
3. When the input current is the minimum (0mA or 4mA), please adjust the ZERO potentiometer to let VOUT
  output be the minimum (0.0V or other voltage)
4. When the input current is the maximum (20mA), please adjust the SPAN potentiometer to let VOUT be
  the maximum (3.3V or 5V, 10V; when the input is 4-20mA, output minimum is 2.5V)

Adjustment Range:
4-20mA:
1.0-2.5V: J1 1,2 pin are short circuit connected; 3, 4 pin are short circuit connected
2.0-3.3V: J1 1,2 pin are disconnected; 3, 4 pin are disconnected
3.0-5V: J1 1,2 pin are short circuit connected; 3, 4 pin are short circuit connected
4.0-10V: J1 1,2 pin are short circuit connected; 3, 4 pin are disconnected

0-20mA:
1.0-3.3V: J1 1,2 pin are short circuit connected; 3, 4 pin are short circuit connected
2.0-5V: J1 1,2 pin are short circuit connected; 3, 4 pin are short circuit connected
3.0-10V: J1 1,2 pin are short circuit connected; 3, 4 pin are disconnected