Testing Hdmi Audio Return Channel (Arc) 780Ah Only - Teledyne Lecroy 780 User Manual

780/780AH Handheld Test Instrument – User Guide
5. Touch select the values for the Bits per Sample using the three buttons provided. (24 bits is selected in
the example above.)
6. Touch select the Sampling Rate by incrementing the associated arrows adjacent to the current value.
(Refer to the screen shot above which shows 96 kHz selected.)
7. Touch select the Channels by incrementing the associated arrows adjacent to the current value. (Refer to
the screen shot above which shows 7.1 selected.)
8. Specify the Level by touch selecting the associated increment or decrement buttons showing +1dB and -
1dB. (Refer to the screen shot above which shows the level at 0dB.) Repeat for each channel. You can
specify the level for each channel individually.
9. Specify the Frequency of the sine wave by touch selecting the associated increment or decrement buttons.
There are four buttons on the left of the current value. (1.00 kHz is shown selected in the screen shot
above) The four buttons provide a variety of increment and decrement values for convenience. Repeat for
each channel. You can specify the frequency for each channel individually in 1 Hz increments.
Note: Always touch select the Align button to ensure that the sine waves for all channels are aligned.
10. Specify which channels you want to mute by touch selecting a channel and then touch selecting the Mute
activation button. You can only select one channel at a time. Note that only the active channels (the ones
specified in Channels will be selectable. (Refer to the screen shot above.)
4.8.5

Testing HDMI Audio Return Channel (ARC) 780AH only

You can test the HDMI 1.4 Audio Return Channel using the 780AH. The selected audio is output from the
780AH's HDMI IN connector in this case. The HDMI IN connector emulates an ARC Tx device to test the ARC
Rx function on an A/V Receiver that supports the Audio Return Channel.
Note: The 780AH does not support the CEC commands necessary to activate the ARC Rx function in the
connected A/V receiver. Therefore you will have to have some other method of activating this ARC function in
the A/V receiver under test.
1. Make the cable connection between the 780AH HDMI IN connector and the A/V receiver's HDMI 1.4
capable output connector.
The following illustration depicts the test setups for the HDMI audio return channel.
November 17, 2016
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