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980 HDMI Protocol Analyzer User Guide
7 Testing HDMI Sources, Cables and Distribution Networks for Pixel
Errors
The 980 HDMI Protocol Analyzer enables you to test the video quality of an HDMI stream. There are two tests
available: 1) Pixel Error test, and 2) Pseudo-Random Noise (PRN) test. These tests are only available through the
Receiver application in the "Real Time" mode on the embedded 980 GUI Manager display. The test are not
available on the external 980 GUI Manager.
The Pixel Error test and the Pseudo-Random noise test can also be run through the command line. The
commands necessary for running these tests are included in this chapter.
The Pixel Error test (Frame Compare) checks for pixel errors in the HDMI stream from an upstream source device
through a cable or distribution network. The Pixel Error test enables you to verify either the source, the cable or
distribution network or any combination of the three. For example, if your application is to test distribution network
components such as splitters, switches and extenders, then you would use a known-good source device and
known-good HDMI cables. For testing a source, you would use the Pixel Error test with a short known-good HDMI
cable. You can also use the Pixel Error test to test an HDMI cable if the two cable ends are not, and cannot be,
collocated.
The PRN test (Cable Test) uses a specific pseudo-random noise test pattern designed to stress a cable or
distribution network. The test is run in a loop back configuration with the 980 HDMI Protocol Analyzer Tx looped to
the Rx port. The test enables you to verify a cable or distribution network. For example, if your application is to test
a distribution network components such as splitters, switches and extenders, then you would use known-good
HDMI cables and loop the near and far ends to the 980 Tx and Rx ports.
7.1
Accessing the Real Time mode
To access the Real Time mode:
1. From the embedded 980 GUI manager if you are currently in the Main capture panel you can access the Pixel
Error test through the View pull-down menu by selecting Receiver or by touch selecting Receiver activation
button as shown below.
Page 143
Rev. A1
December 19, 2012
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