PeakTech 4390A support

Submitted by Uwe Hermann on Fri, 09/15/2017 - 22:35

It's been a while since support for a new DMM was added in libsigrok. As of yesterday we now also support the PeakTech 4390A multimeter.

This is a rebranded Metex M-3860M (even says so on the device itself, in addition to the PeakTech 4390A rebrand).

It uses the "usual" Metex 14-byte ASCII-based protocol, so adding support for it was simply a matter of adding the respective metadata entries for it in the existing serial-dmm driver.

The initial patch was contributed by Frank Stettner, thanks a lot!