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802BT/802R Video Test Generator User Guide 123
Measuring pixel errors
In cases where the external HDMI/DVI device cannot generate pseudo-random noise, a
“delta error” testing capability is provided that allows analysis for flickering pixels in a
still-frame test image. With the video signal connected to the analyzer input, signal quality
can be measured blindly and test results delivered in simple numeric terms.
The procedures below provide instructions through the front panel. Note that you can also
configure the analyzer to measure pixel errors through the command line. For procedures
using the command line refer to “Pseudo-random noise generation commands” on page
132.
Setting delta error patch parameters
To enable and configure delta error patch testing by the analyzer, you must set certain
analyzer parameters properly. Use the procedure to configure the analyzer to test for delta
error patch testing.
To set delta error patch testing parameters:
1. Start the Analyzer Setup Utility (see page 112).
2. If necessary, see “Setting up analyzer to measure timing” on page 114 for steps to
configure the appropriate HDMI/DVI signal source and timing parameters.
3. Press and release the Step key.
The Step key illuminates and the Analyzer Images field is highlighted.
4. Using the Format knob, select the Delta Error Patch Setup field.
5. Using the Image knob, specify whether to enable (ON) or disable (OFF) delta error
patch.
If set to OFF, delta error patch is disabled and all associated fields are disabled.
6. Using the Format knob, select the Travel field.
7. Using the Image knob, specify how you want the patch to move across the display as
follows:
• Select Zig Zag to move over the active video in a zig zag fashion.
• Select FIXED to move over the active video in a fixed position.
8. Using the Format knob, select the Parameters field.
9. Using the Image knob, specify how you want the delta error patch implemented as
follows:
• Select AUTO to allow the generator to automatically set the patch settings. The
patch width and height are calculated based on size of the active video area.