Mini Panel Meter, 3 Wire, 100VDC
|Item Number: 32321 ME|
|Requires a separate Power Supply|
3 digit LED panel Voltmeter
For + Voltage only;
Note: Power & Input Share the Common Black lead
Black Wire: Power Supply - & Input -
Red Wire: Power Supply + 3 to 30VDC
White Wire: + Input
Supply Voltage: 2.5-30VDC
Metering Input Range: 0-100VDC (99.9V)
Character Height: .28"
2 screw mounting.
Cutout: 22.5 X 10.5mm
W: 33mm O/A H: 11mm D: 9mm WT: .012
||Display Voltage Change
|I changed the 100v input. In one corner there is a chip resistor marked 334. I placed a 220K resistor across it and changed the display so that 5V input = 10.0V readout. Other values = other display readouts. Initially used potentiometer to find desired readout vs input. No attempt was made to change the decimal but it could be blocked with a dab of black paint. Solder carefully!!!|
|- Woody, VA|
|Use of a red filter red gel filter in front of the display will suppress unlit segments. Greatly enhanced contrast! Google red gel filter.|
|- Woody, VA|
||Which resistor to short out?
|I see a 330k, a 2.2k, and a 12k. Which one should be shorted to change the range to 0.00 - 9.99v?|
||Versatile, easy to use
|I bought a bunch of these because of the three-wire configuration; I wanted to measure voltages other than the supply, which shared a common ground.
Theyre very compact; only the mounting tabs stick out beyond the area of the display itself.
Theyre very easy to use, of course, and also easy to mount. I wanted a somewhat dressier look, so I 3D-printed bezels to allow them to mount neatly through a rectangular hole in the sheet metal panel with no exposed hardware. Unlike other units of this type, the LED segments in these are surrounded by a black background, so no extra smoked lens in necessary for good contrast in bright lighting.
I also modified some of the units to display 0 to .999 volts, rather than the 0 to 99.9 volts theyre designed for. This was very easy, requiring only that a single surface-mount resistor be replaced with a wire jumper, and also had the side effect of increasing the range on the on-board calibration trimmer.
These are great little units, especially at the price. I have taken to scattering them throughout projects Im working on, so I can monitor voltages at various points in real time during development.|
|- Mark Moulding, CA|