LXI Class-C-Compliant Power Meter A P-Series power meter is a LXI Class-C-compliant instrument, developed using LXI Technology. LXI, an acronym for LAN eXtension for Instrumentation, is an instrument standard for devices that use the Ethernet (LAN) as their primary communication interface. Hence, it is an easy- to- use instrument especially with the usage of an integrated Web browser that provides a convenient way to configure the instrument’s functionality.