The PowerLogic ION7550 and ION7650 each have a different feature set:
ION7550: revenue-class power and energy metering, event and min/max logging, historical logging (up to 800 channels), expandable memory, sag/swell monitoring, harmonics measurement, waveform capture at 256 samples/cycle, setpoints, digital and analogue I/O, and Internet-enabled multi-port communications
ION7650: adds symmetrical components measurement, fast transient detection, waveform capture at 1024 samples/cycle, and power quality compliance monitoring.
Characteristics (some features are optional):
Panel-mount, large customisable LCD display, available without display
Multilingual support for English, French, Spanish and Russian. User-configurable IEC or IEEE notations. 12/24 hour clock support in multiple date/time formats.
3-phase, 4-quadrant metering, class 0.2 accuracy (IEC, ANSI)
Voltage, current, neutral and earth current, power, frequency, power factor, demand, energy, and time-of-use metering
Instrument transformer correction, transformer/line loss compensation
IEC 61000-4-30 class A ed. 2, IEEE 519/1159, EN50160, IEC 61000-4-7/4-15 power quality compliance monitoring