Quantum Data 881 - Manual (Page 415)

881/882 Video Test Generator User Guide (Rev A.22) 397
To obtain a scope trace of your CEC message:
1. Connect the device under test and the 882CA to the oscilloscope.
a. Connect the HDMI output of the device under test to the first HDMI connector on
the TPA-CEC-RR test fixture.
b. Connect the HDMI cable from an HDMI Tx port on the 882CA.
c. Connect a 75 ohm coaxial cable from the 882CA’s special sync BNC connector to
one of the oscilloscope’s input channels.
d. Connect the appropriate probe from the Scope output of the TPA to another input
channel on the oscilloscope.
e. Set the oscilloscope to trigger on the channel that the special sync output is
connected to.
The connections are summerized in the figure below.
The
2. Enter a CEC message from the command line in accordance with the procedures in
“ Sending CEC messages from an emulated HDMI CEC device ” on page 366 such as
the following.
CEC1:MSGX 3 0 83 //request physical addr of device at addr 0 from a
device at address 3 for example
You will then see a series of bit timings from the CEC devices on the oscilloscope.