It measures 3/4-phase current and voltage in 4-quadrant operation in class 0.2, and thus operates in class 0.5s as well as all common network parameters, e.g., harmonics up to the 50th harmonic. The device is connected via current transformers with N/5 A and N/1 A. It represents power quality according to EN 50160, EN 61000-2-2, EN 61000-2-4, and EN 61000-2-12. It features a brilliant large color graphic display. The UMD 98 is comfortably operated via 5 function keys. It has two analog inputs for RCM measurement. It can be used in 230/400 V TN-S networks. It has a large 512 MB memory and an integrated web server. Access to the device is possible via the Ethernet interface (with 5 ports) and the front mini-USB port. This allows for the reading of Internet protocols and easy integration with PLC and building management systems. Digital I/O and a serial RS485 interface are also integrated. For power analysis, the measuring device can be expanded with the firmware modules PQ S and GO. The software ENVIS is used for parameterization and visualization of the device. The CPU operates at 25.6 kHz.