The ION 7550 and 7650 are high end power quality meters. We recommend these meters when you need access to sags, swells, transients, and the harmonic spectrum. One of the distinguishing features of this meter is disturbance direction detection, which provides an indication of whether a power quality event was initiated upstream or downstream of the meter.
With higher-end fidelity, the 7650 captures a higher waveform resolution. Its granularity within cycles is much greater than its sister meter.