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278 Chapter 9 Analyzing Digital Sources and Cables
ALLU // Applies the format to the generator
Any built-in formats may be used for this test. However, we recommend using several
formats spread over a wide range of frequencies. For example, the Test150 format is
commonly used to test at the maximum pixel frequency for HDMI. The DMT0660 format
can be used to test at a very low frequency (25.175 MHz).
Use the following formats to test HDMI over a range of frequencies:
7. Enter the following commands to run the pseudo-random noise test.
PNSP 100 // sets pseudo-random noise for 100 sequencs
PNAU // runs the pseudo-random noise test for the specified
number of frames
Note: The test will stop automatically if configured to run in the single or multi-shot
mode. If you initiate the test in the continuous mode, you will have to enter a carriage
return to halt the test after PNAU is invoked.
8. Enter the following commands to view the results of the test.
GPER? // returns the pixel error rate in errors per billion
GNPT? // returns the number of pixels measured in billions
GCET? // returns the number of bad pixels for R, G, B components
GFED? // returns information about the first error encountered
Analyzing pixel data (pixel error test)
The following is an example of using commands to test an HDMI/DVI transmit device’s
pixel data using pixel error test.
To view specific timing information of an external HDMI/DVI source signal:
1. Connect the HDMI/DVI transmit device to an HDMI IN connector on the generator.
2. Using a terminal emulator, establish a terminal connection with the generator. Refer
to “Establishing a terminal session with the generator” on page 31.
3. Choose the connector to which the transmit device is connected by entering the
following commands:
XVSI:IN 1 // Selects the HDMI-1 input connector
ALLU // Applies the interface setting to the generator
4. Choose the HDMI-H (or HDMI-D) item by entering the following commands:
Format Pixel rate (MHz)
TEST150 150.000
1080p60 148.500
720p60 74.250
DMT0660 25.200