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README.md
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An internal extension board for the HP3478A Multimeter. USB-CDC-GPIB bridge (Prologix-style) and an internal feature controller.
Uses WCH CH32V203 (RISC-V) MCU.
It enumerates as a standard serial device (e.g., /dev/ttyACM0 or COMx).
PCB [here](https://git.ayau.me/mira/mhardware/src/branch/master/hp3478a-ch32-ext)
![PCB](./img/IMG_20251130_023748.jpg)
## Menu System
Extended features (Continuity, Temp, etc.) can be accessed using the SRQ button of HP3478A without a PC

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