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
view more