Macrofab Engineering Podcast

MEP EP#240: Disturbed Solder AccuracyParker 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