Power supply noise

Can someone tell me what regulators we have on the APM1 and how good they should be ?

looking at the 5V rail either off the telemetry port or the SPI port i have a variance of -+ 50mV
so it varies between 4.61 to 4.69 Volts

Testing with a Agilent U1232A  so it's not some cheap $10 DMM.

anyone else able to test to tell me if I have a fault.

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Replies

  • Hi Gabriel,

    Not so easy to answer your question without having the wirings you've made. The first two things you have to check are:

    1. Drawing excessive currents from points which can't deliver such;

    2. Overlapping current contours. This is the most common mistake in wiring.

    Best regards

    Nick

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