Teledyne LeCroy Conquest User Manual - Users Manual - Manual (Page 173)

Current Measurement (Optional)
163
VBus Droop Measurement
The VBus droop measurement determines the VBus voltage drop when a new
device (load) is attached to the USB bus. The VBus droop measurement is
performed with the analyzer and a USB host connected as shown in Figure
124.
Figure 124 VBus Droop Test Setup
Performing the Measurement
Click the VBus droop button in the
Current & Voltage Measurements project selector to start the VBus Droop
measurement.
Each time this measurement is performed, the result is written to the default
Out.vsb file, overwriting the previously saved test. To retain the current result,
click the ellipses next to the output file name and enter a new file name.
USB Host
Parallel Port or USB Cable
Windows Based System
With Analyzer Software
STANDARD
LOAD 2
USB Port 1
USB Port 2
STANDARD
LOAD 1
Attached during test