802BT/802R Video Test Generator User Guide 5
Image knob
The Image knob is used to select a test image from a list of stored images. The exact
behavior of the knob depends upon the status of the Image key. Turning the knob when
the light on the Image key is extinguished scrolls through the main list of test images.
Not all images are supported by all signal formats. Some images in the main image list
may be skipped while certain formats are selected. For example, the ColorBar image will
be skipped whenever a monochrome format is selected.If the currently selected image
cannot be drawn given a newly selected format, the Outline image is automatically drawn
after the new format has finished loading.
Some of the image names in the main list may refer to a sub-set of two or more different
images. The images in the sub-sets are selected by first selecting the name of the desired
sub-set from the main image list. If the sub-set consists of just two images, pressing the
Image key will toggle between the two images. The key is illuminated when the second
image is showing.
Image Step key
The Image Step key determines the behavior of the Image knob in normal operating mode
where it is used to select alternate versions of a given test image. The Step key will
illuminate only when you have selected an image with multiple versions. The following
procedure describes how to select image versions.
To select image versions:
1. Using the Image knob, select an image that has multiple versions.
2. Press the Step key. The key illuminates.
3. Turn the Image knob to step through the image versions. As you turn the knob, the
image name on the LCD will not change.
4. Press the Step key again. The light on the key extinguishes, and the Image knob
returns to normal operation.