Quantum Data 881 User Manual page 459

882 Video Test Instrument User Guide (Rev A.35)
ISUB 1 // Enables sub images
IVER 1 // Specifies the first image version
IMGU // Activates the image version
5. When you are finished, disable image versions by pressing the Options key and
choosing More until a - appears next to it.
Alternatively, to disable image versions using the command line interface, enter the
following command:
ISUB 0 // Disables sub images
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