Grass Valley AMX-3981 2014 - Manual (Page 61)

GUIDE TO INSTALLATION AND OPERATION
AMX-3981 | 55
The Phasemeter (located at the bottom of the RALM meter display) is a
small meter that represents the phase correlation factor between the two
channels of a pair.
Note – The level and phase meters are disabled for channels carrying
non-PCM audio (Dolby E, Dolby Digital, Dolby Digital Plus or other non-
PCM types).
180° 90° 0
5.14 Test panel
This panel contains a pulldown that allows the user to select
an internally-generated test signal to replace the program
signal at the AMX-3981 output.
OFF: the program signal appears at the output, and test
signals are OFF
Color Bars and Tone: sends a 75% color bar test pattern
(100% white), along with audio test tones (a continuous tone
on right channel with pulsed tone on left channel in every
pair) to the AMX-3981 output.
Lip Sync: sends a special test signal comprising color bars
and tone plus a detectable element that is used to align
audio-video delays in a processing path. This AMX-3981
becomes the transmitter in the alignment path. A second
device (e.g. FRS-1801) will perform the measurement at the
other end of the path.
• The special test signal consists of 75% color bars
within which a white square is inserted every 4
seconds for a duration of 10 frames. Simultaneously
with the beginning of the first field of video containing
the white square, the 16 embedded audio channels
and the 8 AES outputs are pulsed with a tone lasting
Figure 5.50 Test panel
Figure 5.49 RALM meter display