Specifications:

• Power supply voltage: 4-30V
  
• Measurement range: 0-100V
  
• Upper/lower limit setting range: 0.1-99.9V
  
• Upper/lower limit output mode: Turning on the setting range will output a high level,
• otherwise it will output a low level.
  
• Minimum resolution: 0.1V
  
• Refresh rate: 300mS / time
  
• Working temperature: -40~+ 85°C
  
• Enter reverse polarity protection: YES
  
• Size: length 29mm width 23mm height 10mm

Wiring instructions:

1. As a two-wire meter application, please send the short circuit board R1 and connect the input terminal of the input voltage to display. (When using a two-wire measurement range does not exceed 30V)
   
2. As the three-wire head, use the R1 board to leave the table, and connect the ground and power supply voltage to the 4-30V power supply for the socket. Indirect ground voltage and test voltage input to be measured. (The second to the board pad is the same, can be done according to the actual wiring one or two)
   
3. Adjust the panel potentiometer to display the value of the desired effect.
   
4. The 5PIN pin is used to expand the output, K1 and K2 are used for the onboard external button switch lead, the keypad, and the two PINs are via the external button. The button function is the same as the same function button panel. The LV is used as the lower limit alarm output. When the value is lower than the set value, the output is low. HV high limit alarm output, the output is set to a lower value than the upper limit. LV, HV output is used to drive the control signal of the drive circuit, please add lights or other loads of the relay.
5. Upper and lower limit setting method: Press two keys, the red light (HV) lights up, press + or - key to set the desired alarm limit voltage value. Then press both buttons simultaneously, yellow (LV) lights up, press + or - to set the desired lower alarm voltage. Then press both buttons simultaneously to exit the setup.

Note:
When using two wires, the measurement range and power supply range are the same, so do not exceed 30V measurement. When the measured voltage exceeds 30V, use three wires!