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DSOX3PWR/DSOX4PWR/DSOX6PWR Power Measurement Options

Data Sheets

Achieve Cost-Effective Analysis of Your Switch Mode and Linear Power Supply Characteristics

Today’s power supply designers are facing an increasing number of constraints in the development of high-efficiency, low-cost power supplies. Cost-effective solutions used to be the designer’s key target. Today, rising energy costs bring power supply efficiency to the forefront. Additionally, other constraints such as design compactness, migration to digital control, tighter voltage tolerances, and regulations for power quality and EMI force the need for quick and thorough power supply testing. Increasing design constraints translate into more time dedicated to power device measurement and analysis for today’s power supply designers.

In spite of the increasing analysis capability offered by many oscilloscopes over recent years, it is not uncommon to see designers perform measurements and analysis manually. These measurements typically take a considerable amount of time to capture, analyze and report.

The Keysight Technologies, Inc. DSOX3PWR, DSOX4PWR, and DSOX6PWR are power measurement and analysis options that are integrated into InfiniiVision 3000, 4000, and 6000 X-Series scopes. The embedded application provides a quick and easy way of analyzing the reliability, efficiency and performance of your switching and linear power supplies.

These power measurement options also come with the user license for the U1881A-003 PC-based power measurement and analysis software that provides even more powerful insight into your power supply measurements.

Power Device Analysis

The switching loss in a power supply determines its efficiency. You can easily characterize for instantaneous power loss and conduction power loss at the switching device over a designated switching cycle. 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. The di/dt and dv/dt represent the rate at which the current and voltage change at switching. This helps in analysis of reliable operation of the switching mode power supply.

Line Power Analysis

Power supply designers need to characterize the line power for power quality, harmonics and conducted emissions under different operating conditions of the power supply. Some of the implicit measurements are real power, apparent power, reactive power, power and crest factor and graphical display of harmonics with respect to standards such as IEC 61000-3-2 (Class A, B, C, D). By using a current probe and power measurement option, conducted power line harmonics can be measured. Also, line power analysis includes the inrush current measurement that shows the peak inrush current value when the power supply is first turned on.

Power Quality Analysis

The Power Quality analysis shows the quality of the AC input line. Some AC current may flow back into and back out of the load without delivering energy. This current, called reactive or harmonic current, gives rise to an “apparent” power which is larger than the actual power consumed. Power quality is gauged by these measurements: power factor, apparent power, true power, reactive power, crest factor, and phase angle of the current and voltage of the AC line.

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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