Analyzing pixel data (pixel error test) – Quantum Data 881 User Manual

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Chapter 9 Analyzing Digital Sources and Cables

// 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: