![]() It’s a poorly documented system, but was able to find some documentation for this meter. With normal logic levels, the only thing left to do was to figure out how to read the data the meter was sending. ![]() Converting the bipolar logic to TTL logic was as easy as desoldering the photodiode from the circuit and tapping the serial data out from that. The meter in question is a Tenma 72-7735, a lower end model that still somehow has an opto-isolated serial output. Some modifications to the meter were required to get it working with a microcontroller, and a few bits of Python needed to be written, but is getting useful data out of his meter. Bought a multimeter with the idea of using its serial output as a source for data logging. A multimeter with a serial port is a blessing, but it’s still RS-232 with bipolar voltage levels.
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