These 0.36" voltmeters can measure up to 50VDC as they have a separate power supply wire and a common ground. You can use them in two ways:
If you connect the positive supply terminal and the voltage sense terminal together, you have a meter that will measure up to 30 volts DC and which is powered from the voltage to be measured, so needs no extra power supply.
If you want to measure the full voltage range of 0-50V, then you power the meter via the supply terminals (the supply can be from 4 to 30V) and feed the voltage to be measured into the sense terminal.
But, unlike my other panel meters, these have under voltage and over voltage LEDs and control outputs, so you can use these for tasks such as battery protection or charging, or anywhere you need to control something based on voltage.
To set the setpoints of these units, do the following (thanks, John H!)
Lower Set Point
Press and hold the right button until P1 appears on the display.
Press the left button to show the current set point.
Press the right or left button to increase or decrease the set point voltage.
Press and hold the right button again to go back to P1.
Continue pressing the right button to cycle through P2 - P# to return to the normal voltage read-out. The lower set point is fixed and will display the yellow LED when the input is below the set voltage.
Upper Set Point
Press and hold the left button until P1 appears on the display.
Press the right button to show the current set point.
Press the right or left button to increase or decrease the set point voltage.
Press and hold the left button again to go back to P1.
Continue pressing the left button to cycle through P2 - P# to return to the normal voltage read-out. The upper set point is fixed and will display the red LED when input is above the set voltage.
The red LED indicates overvoltage and the yellow one undervoltage. Under and over voltage outputs appear on the row of 5 solder pads at the bottom, along with a ground terminal and the two switch terminals, so external switches can be used. The power and sense terminals are the 4 solder pads on the right hand end of the display.
These are ideal as battery monitors or anywhere you need a small panel meter.
Specifications:
Dimensions: approx 29mm x 23mm x 10mm high
Measuring range: 0-50V DC
Display: 0.36 inch (9mm) three digit with auto-shifting decimal
Resolution: 0.05V
Refresh rate: 300ms
Minimum input: 0V DC
Maximum input: 50V DC
Power supply: 4-30V DC
Working temperature: -40 to 85°C
Polarity protection: On power supply inputs, not on sense input.
This product was added to our catalog on Friday 14 March, 2014.
