Hi everyone !
I'm currently using a Raspberry Pi 3 with two ADS1115 ADCs to take readings from a magnetic fluxgate sensor (FLC-100 from Stefan Mayer Instruments). Each sensor does have a typical consumption of 2 ~ 5 mA. I do use three sensors. I'm using two channels of each ADS1115 to measure it in single-ended mode (that's why i'm using two ADC chips).
My problem is that yet with the best Raspberry 3 switched power suply available (model T5875DV, from Stontronics) i'm getting some variations on the 5V supply for the three sensors (the decimal separator here in Brazil is the Comma):
The specs for the power source that i'm using, are:
Output Regulation: +/-5%
Line Regulation: +/-2%
Ripple & Noise: 120mVp-p Maximum
As i've measured by looking at the chart, seems the Power Source is doing very well for it's specs...but unfortunately I do need more precision in my academic project because the output of the sensor is in voltage too, so a little noise on it's supply can mess up the magnetic readings .
I do need a maximum of 0.0001 Volts of variaton on the power source, so anyone knows of way to regulate this 5Volts output from my power source to a maximum of 0.001% accuracy / precision or better ? It does need to have at least 35 mA of current output available to keep the current consumption from the three sensors with safety, being possible to power the two ADS1115 too.
