Circuit Break - A MacroFab Podcast

MEP EP#240: Disturbed Solder Accuracy

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MEP EP#240: Disturbed Solder Accuracy

Parker

  • Got a fully automatic screen printer!
    • ESE US-2000X
    • Potentially lower our minimal paste size
    • Twitch Live Stream podcasts?
    • Amazon multimeter probes

      • Stephen

      • High voltage low current measurement
        • Don't want to break the connection so a traditional ammeter isn't going to work
        • Sticking with the read both sides of a resistor method
        • Caddock 1776-C681 high voltage high resistance high tolerance divider
          • 1/100 so 0 to 500v becomes 0 to 5v
          • ADC - MCP3551-E/SN
            • 22 bit
            • SPI
            • 2.4 meg ohm input impedance
            • Ideally the voltage divider has a “gain” of 0.01 but if the ADC is directly attached to the divider the gain is around 0.0096
              • Full scale would be 4.8V instead of 5V
              • Solution: add a buffer
              • AD8244BRMZ
                • Quad buffer
                • Typical offset voltage of 100uV
                • Gain error of 0.03% max on +/-15v rails
                • 10T ohm and 4pf input resistance/capacitance - 10^12
                • Gain error is now 0.009999999901 - Close enough
                  • ...more
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                  Circuit Break - A MacroFab PodcastBy MacroFab, Inc.
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