Vibration levels and frequency components can provide clues to imbalance, misalignment, mechanical loosening, bearing problems, or gear abnormalities. The conclusion depends on the measurement point, rotational speed, load condition, and machine design. Therefore, we compare several measurement directions and, where available, previous measurements. A reliable diagnosis can only be derived from the spectrum, trend, and technical context.

Partial discharge measurements can reveal local electrical activity in or on the insulation. The loss factor helps assess the overall insulation condition and its changes. Both methods address different questions and are used depending on the voltage level, design, measurement options, and reason for the measurement. We evaluate the results together with other electrical tests and the operating history.

Many fault patterns produce similar individual symptoms. An elevated temperature, for example, can have electrical, mechanical, or process-related causes. By combining vibration, temperature, electrical measurements, and visual inspection, hypotheses can be tested against each other. This increases the reliability of the findings and helps to prioritize measures according to urgency and actual risk.

Thermography visualizes temperature distributions under suitable operating conditions and can provide clues about electrical contacts, cooling problems, bearing issues, or uneven loads. However, the results depend on the load, surface area, visibility, and environmental conditions. An unusual temperature reading does not automatically indicate the cause. Therefore, we interpret the thermal image in conjunction with operating data and supplementary measurements.

A single diagnosis may suffice if a clearly defined problem is investigated under reproducible conditions. However, in cases of sporadic anomalies, progressive damage, or critical machinery, a series of measurements is often more informative. Trends should be evaluated under comparable load and speed conditions. This reveals whether a value is merely fluctuating or is actually developing towards damage.

Indications can include characteristic frequency components, envelope signals, increasing vibrations, temperature changes, or unusual noises. Speed, load, lubrication, and measurement point influence the assessment. Therefore, we combine spectrum, trend, and operating conditions before recommending any action.

An efficiency analysis reveals where losses occur between electrical input and usable process output. The motor, inverter, coupling, gearbox, and driven machine can be significant individually or in combination. The results help prioritize technical measures based on their potential for savings and their operational relevance.

Measuring points, sensors, speed, load, and process state must be sufficiently comparable. Changes to the machine or system must be documented along with the date and operating conditions. This is the only way to distinguish whether a measured value was altered by the machine's condition or by other operating conditions.