A Diy multimeter is an easy prospect, right?
Back in the day, you could make one pretty easily with a decent panel indicator and precision set of resistors, and now a digital can be had for throwaway prices from China
The array of selection array of switches and resistors, microcontrollers, and seven-segment displays are universal for a multimeter design, which means there is nothing too special about them in a measuring instrument. high precision, except that here it uses an FPGA for timing.
DIGIT DIY MULTIMETER
Where the meat is in this project is in the ADC and its associated tension benchmark, and for that, it takes a surprising turn.
Instead of taking a standard ADC part from one of the usual manufacturers,
he created his ADC from scratch using operational amps, and to understand why this is the case, he takes us on a journey into the world.
Additionally, the integration of ADCs. These circuits are very well explained in a 1989 HP journal article and are a smart design that measures the time,
it takes to charge and discharge a capacitor from the voltage to be measured and compares it at the same time from the reference voltage.
HP Article About Diy Multimeter
The beauty of this is evident in the HP article about DIY MULTIMETER, that the math of the charge/discharge cycle negates all effects of analog component values, allowing the much higher accuracy of reference and clock timing to dictate
. We can’t wait to see more of this project.
It’s surprising how few home multimeters we have on these pages, perhaps because of the cheap ones. Of the few we’ve had, this state-based Nixie is perhaps the most unusual.
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