Page 16 of 32
V1682OPMA.doc
17 February, 2005
For example,
If there was a left right swap on channel A, then the status for channel AL would flash up the
message ‘
AR
AL
‘, indicating that channel A right of the generator is connected to the channel A
left input of the V1682.
If, not only were the left and right channels swapped on channel A, the channel feeding the V1682
channel AR was inverted as well, then the message ‘
AL
AR
τ
’ would be displayed periodically.
The down arrow at the end indicates that the channel has been inverted.
If, for some reason, the unit is not able to make a measurement for the channel, then dashes will be
displayed instead of a delay reading, e.g. ‘
BL ----
’ , and the message ‘
??
BL
’ will be flashed
up, indicating that both the delay and source are unknown.
4.5.2
MEASUREMENT
menu
The measurement menu contains all of the information available in the quick access menu (Sec.
4.5.1) plus audio level measurements for each channel.
Audio/Video delay and source information can be found in the
MEASURE
menu under two sub-
menus, one containing information for channel A the other channel B (
MEASURE > Audio A
and
MEASURE > Audio B
).
In each of these sub-menus are to be found 4 measurements; two delays, and two providing source
information for channel (See table below).
Audio levels may be read under the
MEASURE > Aud Lev
menu. All level measurements are in
dBu (relative to 0.775mV RMS). It should be noted that the level reading is always in dBu, even if
the input is digital. The relationship between digital and analogue domains is set up with the
MAL
control (See Sec. 4.4, page 16). It is also important to note that the V1681 VALID generator always
generates a tone level of 0dBu on analogue outputs, and the equivalent digital level dependant on
the MAL setting of the V1681. It is important that the MAL of both the V1681 and V1682 are set up
correctly.
AL -1234
AR -1234
Channel A audio is 1234ms early
with respect to video.
AR
AL
Audio A
AL
AR
τ
Channel A has a left/right swap,
and the signal on AR is inverted.
BL ----
Channel BR timing unknown.
BR 0000
Channel BR is co-timed with video
??
BL
Channel BL from unknown source.
Audio B
BR
BR
Channel BR from correct source.
AL -02.0
AR +02.0
BL -99.9
MEASUREMENT
Aud Lev
BR +00.0
All level measurements are in
dBu. Make sure MAL is set
correctly for digital signals
(See Sec. 4.4, page 16)
4.6 O
N
S
CREEN
D
ISPLAY
4.6.1 Introduction
The on screen display contains the same data that is to be found in the
MEASURE
menu, but
overlaid over the input SDI signal. The display is split into two panels one on either side of the
screen. The left hand display contains source and delay information, with delay being display both
numerically and as a bar graph, and a four channel ppm display on the right.
