Using The 780/780Ah Test Instrument To Test Hdmi Cable Or Repeaters; Hdmi Cable Or Repeater Test; Configurations For Running An Hdmi Cable Or Repeater Test - Teledyne Lecroy 780 User Manual

780/780AH Handheld Test Instrument – User Guide
9 Using the 780/780AH Test Instrument to Test HDMI Cable or
Repeaters
This section provides procedures for testing HDMI cables, cable extenders, splitters, repeaters, etc. The
HDMI/DVI Cable Test runs a pixel error test on the TMDS leads and a continuity check on the 5V & hot plug
leads and the DDC leads. The Repeater test runs a pixel error test on the TMDS leads and a continuity check
on the 5V & hot plug leads and the DDC leads but additionally tests the hot plug delay and the hot plug width.
The cable test and repeater test can be used when the source and sink ends are collocated, in other words can
be connected to the 780/780AH Tx and Rx ports. For a cable or distribution system that is installed and where
the source and sink ends cannot be connected to the 780/780AH, you can use the Frame Compare feature.
The Frame Compare feature captures a reference frame and then compares a series of captured frames pixel
by pixel to the reference frame.
The features and functions described in this section are included only if you have purchased the HDMI
Cable and Link Test option.
9.1

HDMI Cable or Repeater Test

The HDMI/DVI Cable Test runs a test on all the leads in the HDMI cable and HDMI links (when extenders,
splitters, switchers and repeaters are used) except the power bus as follows:
Pixel error test using a pseudo-noise pattern on the TMDS lines using three separate timings:

480p60 using 8 bit/component color
o
720p60 using 8 bit/component color
o
1080p60 using 8 bit/component color
o
1080p60 using 12 bit/component (deep color)
o
Read/write test on the DDC leads and the CEC bus. It reads an EDID at the output from the input.

Continuity test on the 5V/Hot plug leads.

Hot plug delay and hot plug pulse width. The hot plug delay is the time that elapses between the falling

edge of the hot plug line on the on the sink side of a repeater and the falling edge of the hot plug line on the
source side. The hot plug pulse width is the time that the hot plug pulse goes low as detected on the HDMI
Tx side.
9.1.1

Configurations for Running an HDMI Cable or Repeater Test

This subsection provides configurations supported when performing an HDMI cable test or a test of an HDMI
network comprised of repeaters, splitters, extenders, switches, etc.
November 17, 2016
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