I have been spending a little more time on my long running project in the form of breadboarding. I have found that to get the desired scale I need to run one of the op-amps in the sensors at 7+ volts. I thought before connecting to my 20x2 I would check the output with a measure 7.3v input.
the figure of 7.3v maybe called into question though as while I was testing with my oscilloscope the output was 4.97v, my multi meter (which I measured the supply voltage with) measure at the same place read 6.1v. I will be putting a 5v1 Zener on the ADC pin to hopefully stop any harm to the picaxe in the final project.
But the question, which would you trust, a hanntek 6022BE or a £20 multimeter?
the figure of 7.3v maybe called into question though as while I was testing with my oscilloscope the output was 4.97v, my multi meter (which I measured the supply voltage with) measure at the same place read 6.1v. I will be putting a 5v1 Zener on the ADC pin to hopefully stop any harm to the picaxe in the final project.
But the question, which would you trust, a hanntek 6022BE or a £20 multimeter?