Column Control DTX

DSOXT3FRA/DSOX4FRA/DSOX6FRA Frequency Response Analyzer (FRA) Option

Data Sheets

Introduction

Frequency Response Analysis (FRA) is often a critical measurement used to characterize the frequency response (gain and phase versus frequency) of a variety of today’s electronic designs, including passive filters, amplifier circuits, and negative feedback networks of switch mode power supplies (loop response).

Today, engineers typically use network analyzers or standalone low-frequency FRAs to perform these types of measurements. But for the first time in an oscilloscope, automatic frequency response analysis is available for Keysight InfiniiVision X-Series oscilloscopes. This frequency-domain measurement capability is achieved with a swept gain and phase measurement versus frequency (Bode plot).

If licensed with the FRA option, InfiniiVision oscilloscope uses the scope’s built-in waveform generator (WaveGen) to stimulate the circuit under test at various frequency settings and captures the input and output signals using two channels of the oscilloscope. At each test frequency, the scope measures, computes, plots gain (20LogVOUT/VIN) logarithmically and phase linearly. 

  • Dynamic range: > 80 dB (typical)
  • Frequency range: 20 Hz to 20 MHz
  • Sweep or single frequency test modes
  • Fixed test amplitude or custom Amplitude Profile
  • 10 to 100 points per decade
  • Two pair of tracking gain and phase markers
  • Plots gain and phase and tabular view of test results
  • Easily export and/or save measurement results in .csv format for offline analysis

Setting up a frequency response test doesn’t have to be difficult. A single easy-to-use dialog box guides you through establishing all test parameters.

Also available is test amplitude profiling. Improving dynamic range of frequency response measurements is often achieved by simply increasing a fixed test amplitude. However, this technique can sometimes induce waveform distortions and measurement errors during some frequency ranges due to overdriving sensitive electronic circuitry.

But with the Amplitude Profile feature, you can optimize test amplitudes by establishing unique test amplitudes that ramp linearly between decade settings.

One advantage of performing frequency response analysis using an InfiniiVision X-Series oscilloscope is you can monitor VIN and VOUT time-domain waveforms during the swept test to look for possible waveform distortions.

You can also “spot check” waveform quality (sinusoidal purity) at specific frequency settings using the Single Frequency test mode.

At the completion of a Single Frequency test, you can close the FRA Test Results window to view repetitive VIN and VOUT waveforms to make appropriate WaveGen amplitude adjustments for optimization.

Ordering Information

The FRA option is available on all models of the 3000T, 4000A, and 6000A InfiniiVision X-Series oscilloscopes. The WaveGen option is recommended, but it is not required. If your InfiniiVision oscilloscope is licensed with the FRA option but not licensed with the WaveGen option, the FRA option will turn on the WaveGen temporarily for each swept or single frequency response test.

For improved dynamic range, using a 1:1 passive probe, such as the N2870A is recommended.

Note that frequency response analysis measurements (PSRR and Control Loop Response) are also available as part of the suite of measurements in the Power Measurements Option (DSOXT3PWR, DSOX4PWR, and DSOX6PWR).

So if your frequency response measurement applications are primarily focused on power supply characterization, then it is recommended that you order the appropriate Power Measurement Option as opposed to ordering the FRA option.

With the Power Measurements Option, not only are frequency response measurements available, but also a full suite of power characterization measurements including Switching Loss, Power Quality, Current Harmonics, Output Ripple, etc.

×

Please have a salesperson contact me.

*Indicates required field

Preferred method of communication? *Required Field
Preferred method of communication? Change email?
Preferred method of communication?

By clicking the button, you are providing Keysight with your personal data. See the Keysight Privacy Statement for information on how we use this data.

Thank you.

A sales representative will contact you soon.

Column Control DTX