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Optional - Add the deskew board for Voltage and Current Probes for more precise results. P/N DF2001A
SDS2000PWR Data Sheet
Siglent’s SDS2000PWR are power measurement and analysis options. The embedded application provides a quick and easy way of analyzing the reliability and efficiency of your switching power supply
Sheet1 SDS2000PWR Character
The switching loss in a power supply determines its efficiency. You can 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.
Chart 1 By measuring the switching loss and conduction loss, you can characterize the instantaneous power dissipation in a switching power supply.
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.
Chart2 Perform the pre-compliance line harmonic testing of your power supply to the IEC 61000 3-2 standards. This analysis presents 40 harmonics.
Chart 3 The Inrush current analysis measures the peak inrush current of the power supply when the power supply is first turned on
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.
Chart4 The power measurements option provides a results table with the following power quality measurements: Power Factor ,Real Power ,Apparent Power ,Reactive Power and so on
Modulation analysis allows designers to quickly see the on-time and off-time information of the PWM signal. 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.
• Duty Cycle
• Positive pulse width
• Negative pulse width
Chart5 By Modulation analysis can reveal the control loop response of the feedback loop system
Output analysis includes characterization of ripple component in output DC voltage . Ripple is the residual AC component that is superimposed on the DC output of a power supply .Line frequency as well as switching frequency can contribute to ripple .This measurement analyzes the output voltage ripple . This measurement analyzes the output voltage ripple and presents the peak-to-peak value as well as the frequency response of the captured signal.
Chart6 Output analysis includes characterizing the ripple component in output DC voltage
This analysis measures the time taken to get to the steady output voltage of the power supply after the input voltage is applied (turn on time) and for the output voltage of the power supply to turn off after the input voltage is removed (turn off time).
Chart7 The turn-on analysis measures the time taken to get to the steady output voltage of the power supply after the input voltage is applied
Power supplies are subject to transient conditions, such as turn-on and turn-off transients, as well as sudden changes in output load and line input voltage. These conditions lead to one of the key specifications of the power supplies; load transient response. This analysis measures the load transient response of the DC output, namely the time taken for the DC output to stabilize during a load change.
Chart7 The transient analysis measures the load transient response of the DC output, namely the time taken for the DC output to stabilize during a load change
Efficiency analysis tests the overall efficiency of the power supply by measuring the output power over the input power. This analysis requires a 4- channel oscilloscope because input voltage, input current, output voltage, and output current are measured.
Chart9 Efficiency analysis tests the overall efficiency of the power supply
Timing delay errors between voltage and current probes may have a significant impact on power measurements as each specific voltage and current probes have different propagation delays. To make accurate power measurements and calculations, it is extremely important to null out the time delay between the voltage and current probes using a procedure known as“deskewing.” By performing probe deskew before making power measurements, you can ensure the most accurate measurement.
Chart8 Auto Deskew