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25 Power Analysis
25.1 Overview
The T3DSO2000A supports a power analysis function as standard. Power analysis can
help users quickly and easily analyze and debug switching power supply designs. It
automatically calculates Power Quality, Current Harmonics, Inrush Current, Switching
Loss, Slew Rate, Modulation, Turn On/Turn Off, Transient Response, PSRR, Power
Efficiency, Output Ripple, etc. Full use of the Power analysis requires a T3DSO2000A
oscilloscope, a differential voltage probe, a current probe, and a deskew fixture.
Touch Analysis>Power Analysis to recall power analysis dialog
box:
A. Enable/Disable the test
B. Select the analysis item (Power Quality, Current Harmonics,
Inrush Current, Switching Loss, Slew Rate, Modulation, Turn
On/Turn Off, Transient Response, PSRR, Power Efficiency,
Output Ripple, etc.)
C. Turn on/off the state of the analysis item
25.2 Power Quality
The specific measurement parameters of power quality analysis include active power,
apparent power, reactive power, power factor, power phase angle, voltage effective
value, current effective value, voltage crest factor and current crest factor of power input
of a switching power supply.
Type
Power—includes all the items to describe energy flow in a system: Active power,
reactive power, apparent power, power factor and power phase angle.
P: Active Power =
S: Apparent Power = Vrms * Irms
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T3DSO2000A Manual. Page 149
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