Digital fluorescence oscilloscope power loss of switching power supply
Correction of conduction delay errors
It is important to synchronize voltage and current signals to eliminate transmission delays before making power loss measurements in a switching power supply, a process known as offset correction. The traditional method is to calculate the time delay between voltage and current signal, and then manually adjust the time delay through the offset correction range of oscilloscope.But it's a very tedious process.
A simpler approach is to use an offset calibration fixture and select the appropriate oscilloscope, such as the TDS5000 series oscilloscope.During the offset calibration, connect the differential voltage probe and current probe to the test point of the offset calibration fixture. The offset calibration fixture is stimulated by the Auxiliary output or cal-out signal of the oscilloscope, and external signal source can be used to stimulate the offset calibration fixture if necessary.
In addition, the corresponding measuring software can be used on the oscilloscope to automatically set up the oscilloscope and calculate the conduction delay caused by probe connection.The offset correction function can then use the oscilloscope offset correction range to automatically compensate the delay, and the accurate measurement can be started after the test Settings are ready.