Rohde & Schwarz has extended its MXO oscilloscope family with three-phase power analysis, moving a measurement workload that previously required a dedicated power analyzer onto a general-purpose instrument.

The announcement, reported by bisinfotech.com, positions the MXO series for engineers characterizing three-phase systems — motor drives, inverters, power supplies and grid-tied converters — where the measurement task centers on simultaneous voltage and current acquisition across three phases plus neutral or DC links.

What changes for MXO users?

Three-phase power analysis on an oscilloscope consolidates what has traditionally been a two-instrument workflow. Engineers probing a variable-frequency drive or a solar inverter typically measure per-phase voltage and current, then derive active power, reactive power, apparent power, power factor and phase relationships. Automating those computations on the scope's acquisition engine removes manual cursor work and reduces the arithmetic errors that accumulate when power figures are computed from separate single-channel measurements.

For the MXO platform specifically, the addition matters because the series already emphasizes deep memory and high waveform capture rates. Power analysis over long acquisition records is the use case where those specifications earn their keep: switching loss characterization, efficiency measurement over load transients, and harmonic analysis all depend on capturing many consecutive line or PWM cycles without gaps.

Which applications does this serve?

Three-phase analysis is the core measurement for a specific set of development environments:

• Industrial motor drives and servo controllers, where efficiency and switching-loss budgets determine thermal design
• Renewable-energy inverters, where grid-code compliance checking requires accurate power and harmonic figures
• On-board chargers and traction inverters in electric vehicles
• Three-phase UPS and industrial power supplies

In each of these, the engineer needs current probes or shunts on all three phases simultaneously, which pushes the channel count of the instrument. A four-channel scope can cover three phases and a DC-link measurement — the standard configuration for inverter efficiency work.

Scope versus power analyzer: where is the line?

The underlying trade-off is bandwidth and accuracy versus protocol coverage. A dedicated power analyzer delivers accuracy classes and calibration traceability suited to efficiency certification, often at bandwidths optimized for line-frequency fundamentals and low-order harmonics. An oscilloscope-based measurement trades some absolute amplitude accuracy for wide bandwidth — essential when the losses live in the switching edges at tens or hundreds of kilohertz rather than in the 50/60 Hz fundamental.

Engineers buying on this basis should ask which question the instrument must answer. If the deliverable is a certified efficiency number for a datasheet, the power analyzer retains the advantage. If the deliverable is understanding where and when losses occur — a switching event, a dead-time interval, a transient — the oscilloscope's time-domain view and now-automated power math close most of the gap.

Rohde & Schwarz has not yet published complete measured-performance figures, probe requirements or firmware version details for the new capability in the material available at press time, so buyers should verify test conditions — bandwidth limits, current probe de-rating, and vertical resolution at the chosen sample rate — against their accuracy targets before specifying an MXO for three-phase work.

What does this mean for the bench?

The development raises a practical adoption question for power-electronics labs: does a mid-range oscilloscope with integrated three-phase analysis now displace a dedicated power analyzer for development-stage measurement, leaving only certification and standards-body submissions to the dedicated instrument? Labs that answer yes consolidate capital spend, one probe set and one learning curve onto the instrument that already sits on the bench.