MINI PANEL METER Project
Are you looking for a simple mini panel meter for your next project?
A mini panel meter is a great addition to any design if instrumentation is your goal. Many panel meters are large, expensive, and overkill for most simple projects. I have found that CX??? Series meters fit well within these parameters.
In this project, I have added my take to the CX101 panel meter.
This particular panel meter is reliable and of reasonable quality. Best of all is it’s low cost. It is a 3 1/2 digit meter with decent accuracy for the price.
There are many flavors for this meter, and your choice is application dependent. The CX101A & CX101B are designed to use an independent (isolated) ground. Meaning, the signal measured does not share a common ground with the supply voltage for the panel meter. You can use this configuration if you require an ‘in circuit’ measurement not referenced to ground. For example, you may wish to measure current through a shunt resistor located between two active components. Of course one would have to design the circuit correctly.
The model CX101BG is a 5 Volt version that uses a common ground.
The CX101 series consists of three versions:
- CX101B is a 5V version
- CX101A is a 9V Version
- CX101BG is a 5 V version which can use a common ground
For my purposes, I have chosen the common ground version, the CX101BG. The biggest reason for using a common ground here is that I am using a battery as a source.
To make this little guy useful some additional circuitry is added. As The “guts” of the measurement circuit, I have added a power supply and a range selection switch.
This meter project is available in my Panel Meter – Build Log.