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JochiSt / OpenFlowMeter

Measuring Flow
GNU General Public License v3.0
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Calibration using 100Ohm #7

Open JochiSt opened 2 years ago

JochiSt commented 2 years ago

I tested the OFM using two 100 Ohm resistors and a DAC sweep. (From the calibration, it is known, that 32 LSB DAC are about 1mA measurement current)

Channel 0

measurement_20220309_065823_CH0_1023

Channel 1

measurement_20220309_065823_CH1_1023

Overall it seems, that there is a bit to much noise for the low voltages (and currents). This needs further investigations, whether there is some room for improvements.

JochiSt commented 2 years ago

Added 100nF at the position of D5 and D6.

JochiSt commented 2 years ago

Since this effects only channel 0, the results DAC sweep looks more smooth.

measurement_20220311_081058_CH0_1023

And the precision has also increased. Maybe further capacitors are needed to stabilise the measurement circuit.