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Power Software Package for InfiniiVision X-Series Oscilloscopes

Data Sheets

The Power Software Package for Keysight’s InfiniiVision oscilloscopes enables a broad range of automated power supply characterization measurements including critical frequency response measurements such as power supply rejection ratio (PSRR) and control loop response. This package also enables hardware-based pass/fail mask testing and USB PD triggering and decode.

Introduction

The Power Measurements Software Package enables a broad range of automated power supply characterization measurements on Keysight InfiniiVision X-Series oscilloscope including unique frequency response analysis for performing control loop response and power supply rejection ratio (PSRR) measurements. Also included in this package is hardware-based pass/fail mask testing and USB PD trigger and decode capabilities. Table 1 lists the specific measurement capabilities that are enabled on each series with the InfiniiVision Power Software Package.

Power Supply Characterization Measurements

Input AC Power Quality

Power supply designers need to characterize the line power for power quality. Some of the implicit measurements are real power, apparent power, reactive power, power and crest factor Also, input analysis includes the inrush current measurement (not shown) that provides the absolute peak inrush current (positive or negative) when the power supply is first turned on.

Current Harmonics Analysis

Power supply designers need to characterize the line power for harmonics related to conducted emissions under different operating conditions of the power supply. Current harmonics analysis measures the amplitude of harmonic frequency components that can be injected back into the AC grid. Products must meet specific standards of compliance based on IEC specifications. This measurement performs an FFT on the current input, compares amplitudes of odd and even harmonics against a user-selected IEC 61000-3-2 standard (Class A, B, C, or D) with color-coded pass/fail indicators for frequencies up the 40th harmonic, and also report total harmonic distortion (THD).

Switching Device Analysis

The switching loss in a power supply is a major factor in determining a power supply’s efficiency. With the switching loss measurement, you can quickly characterize the power and energy loss over an entire switching cycle, as well as determine losses during particular switching phases. To determine the efficiency of the power supply it is very important to measure the power loss during dynamic load changes. By measuring the switching loss and conduction loss, you can characterize the instantaneous power dissipation in your switching power supply. Locating peak switching loss helps you analyze the reliability of the power supply.

RDS(ON) and VCE(SAT) Analysis

RDS(ON) is the effective drain-to-source resistance of MOSFET type switching transistors when fully turned on during the conduction phase. VCE(SAT) is the saturation voltage of bipolar type transistors when fully turned on during the conduction phase. These parameters can be used by the oscilloscope to more accurately determine conduction losses based on I2RDS(ON) or I x VCE(SAT) calculations.

Modulation Analysis

Modulation analysis allows designers to quickly see the on-time and off-time information of the PWM signal, which is difficult to visualize because the information bandwidth is much lower than the pulse switching frequency. Plotting the embedded variation of on time or off time in the PWM signal over a long period of time can reveal the control loop response of the feedback loop system. This measurement performs data trending on the switching variation of the acquired waveform in the following format.

  • Frequency vs time
  • Period vs time
  • Duty cycle vs time
  • Positive pulse width vs time
  • Negative pulse width vs time 

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