Frequency Response Analysis using Cleverscope

Frequency Response Analysis (FRA) is a powerful diagnostic and characterization technique used to evaluate the behavior of electrical and mechanical systems across a range of frequencies. By applying a known input signal—typically a sinusoidal waveform—over a spectrum of frequencies and measuring the corresponding output, FRA provides insight into how a system responds dynamically under different operating conditions.

The method is widely used in engineering fields such as power systems, control engineering, and electronics. In particular, FRA plays a crucial role in the assessment of components like transformers, filters, and control loops, where frequency-dependent behavior can reveal important information about system integrity and performance. Deviations in the frequency response can indicate issues such as mechanical deformation, insulation degradation, or component aging.

One of the key advantages of Frequency Response Analysis is its non-destructive nature. Measurements can often be performed without dismantling equipment, making FRA an efficient and cost-effective tool for condition monitoring and preventive maintenance. Furthermore, the results are typically represented using Bode plots or Nyquist diagrams, which allow engineers to interpret gain and phase relationships in a clear and systematic way.

Overall, Frequency Response Analysis provides a comprehensive framework for understanding system dynamics, identifying faults, and ensuring reliable operation in complex technical systems.

Gain Phase Measurement with CS548

Gain and phase measurements are fundamental aspects of Frequency Response Analysis (FRA), used to describe how a system modifies an input signal at different frequencies. The gain represents the ratio of output amplitude to input amplitude, indicating whether the signal is amplified or attenuated. The phase describes the shift in time between the input and output signals, typically expressed in degrees.

By sweeping through a range of frequencies and recording both gain and phase, engineers can characterize the dynamic behavior of a system. These measurements are commonly visualized using Bode plots, where gain and phase are plotted separately against frequency. Together, they provide essential insight into system stability, resonance behavior, and overall performance.

Power Supply Rejection Ratio - PSRR

Use the Cleverscope Frequency Response Analyser to measure the Power Supply Rejection Ratio (PSRR) of a power supply with the CS1070 Power Amplifier.

It can manage up to 1A output current over a voltage range of -18V to +30V over a frequency range of DC - 52 MHz. This is sufficient to directly measure many power supplies. If this is not enough, you can inject across a low value series resistor (eg 0.1 ohm). This video shows you how to connect up a CS328A-FRA and CS1070 to measure the PSRR of an LTC3589 over the frequency range 200 Hz - 10 MHz.

Add Reference Curves to Compare Test Data

How to add light shaded curves als reference waveforms to compare test data from several measruements.