Hi,
My Problem:
I have a number of railway ammeters that need to be tested for correct calibration (these are non-mainline so official calibration is not required). These ammeters are used to show the driver the current amperage being produced by the Generator, via a shunt in the circuit.
For one type of ammeter we have, I know that an indicated 2000 amps is 75mv on the input.
My initial Solution:
My initial thought was to use an Arduino based solution but I don't think this is a workable solution with my limited knowledge of the code used and its make up and the need to vary the output voltage. What I was thinking was to use the Arduino control an output voltage between 0 and 95mv in steps thus giving me a "test mode" through the full range of indications. I would still like to pursue this if at all practical.
Another Idea:
Another idea would be to use a small voltage suitable stepped down to provide no more than 95mv with a suitable potentiometer in the circuit to control the actual voltage although a method of reading this voltage will need to be included for correct calibration. Unfortunately this is now outstripping my knowledge in electronic circles.
Without wanting to ask someone to do this for me, can anyone suggest a better way that the two ideas I have or even if there is a simple way of doing this? I will post photos as i move through this little project to show what it is I achieve.
Thanks
Matt
My Problem:
I have a number of railway ammeters that need to be tested for correct calibration (these are non-mainline so official calibration is not required). These ammeters are used to show the driver the current amperage being produced by the Generator, via a shunt in the circuit.
For one type of ammeter we have, I know that an indicated 2000 amps is 75mv on the input.
My initial Solution:
My initial thought was to use an Arduino based solution but I don't think this is a workable solution with my limited knowledge of the code used and its make up and the need to vary the output voltage. What I was thinking was to use the Arduino control an output voltage between 0 and 95mv in steps thus giving me a "test mode" through the full range of indications. I would still like to pursue this if at all practical.
Another Idea:
Another idea would be to use a small voltage suitable stepped down to provide no more than 95mv with a suitable potentiometer in the circuit to control the actual voltage although a method of reading this voltage will need to be included for correct calibration. Unfortunately this is now outstripping my knowledge in electronic circles.
Without wanting to ask someone to do this for me, can anyone suggest a better way that the two ideas I have or even if there is a simple way of doing this? I will post photos as i move through this little project to show what it is I achieve.
Thanks
Matt