At the transient state (On to Off / Off to On) of a power device the current draw becomes large due to the high voltage level. As the voltage and current levels increase so does the device's internal temperature which can result in the device malfunctioning or failing altogether. Every power device has its own area of safe operation (ASO) specification.
Engineers must measure the ASO of inverters and/or switching power supplies to ensure proper operation. To measure the ASO you must capture the transient state of the power device. To observe the ASO, engineers usually apply a load to the output of the inverter or switching power supply while varying the load. Due to the time required to vary the load, the ASO measurement device must have a long record length. For this reason long memory Digital Oscilloscopes are used.
The Yokogawa Model DL7440/DL7480 2GSPS/500MHz/16MW Digital Oscilloscope provides the following solutions for this application :
Improve switching-loss measurements by eliminating skew. The 701936 Deskew Correction Signal Source accommodates both clamp-on current probes and through-type ‘CT' Current Transformers.
8-channel 500 MHz oscilloscope with 16 logic inputs, for applications where four channels aren't enough. Support for eight analog channels, 16 bits with 250MHz logic bandwidth, 16MP of recording memory, power analysis, serial bus analysis, and a broad selection of voltage and current probes.