DCS 900E User Manual page 14

dCS 900E / 902E User Manual
dCS Ltd
Overload Indicator
This overload LED lights for a few seconds when the set overload level is
exceeded by a signal peak. The detection circuitry monitors both input and
digital filtering circuitry for overload conditions. The analogue input sensitivity
trims mounted on the rear panel should be set so that the overload indicator
does not light on signal peaks.
The overload indication given by the dCS 900 / 902 is comprehensive. The
detection circuitry monitoring the digital filter does not simply check the final
output word but all the data from which the output word is formed. If any of these
overload (this may not be apparent from the output data), an overload is flagged.
The filter itself has sufficient numerical accuracy that if the input data is not
overloaded, the filter computations cannot generate an overload - only a raw
data overload can cause an error. The overload indication is thus much more
accurate than any external meter based indication - for this reason it is stored in
the AES/EBU validity bit for later reference.
Menu Set
The
panel). See the section
Master/Slave
The
panel) it sets the clocking mode (master or slave). With the other menu buttons
(white
In Master mode, the calibrated voltage controlled crystal oscillators (VCXOs)
inside the unit generate an accurate sample rate. The LED labelled Master will
be lit to indicate this. If a Master Clock is available, this may be connected to the
Reference In
SDIF-2 Word Clock). To slave the unit to the Master Clock, press the
Master/Slave
take a few seconds. If lock is achieved, the Slave LED will light up brightly and
the Master LED will turn off. To return to Master mode, press the
button again.
If both AES Reference and Word Clock are connected, pressing the
Master/Slave
If the active reference source is lost, the unit will select the next option in the
sequence.
If the
slave when a suitable reference is connected. If both AES Reference and Word
Clock are connected, AES Reference takes priority. Word Clock may be
selected by pressing the
Manual part no: DOC0029021E1
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dCS
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(Overload LED)
-
Set button is used with the other menu buttons
"The Software – The Menu"
Menu Down
Master/Slave button is dual function – on its own
type on the front panel) it is the menu
connector (for AES/EBU reference) or the
button. The unit will attempt to lock to the Reference - this will
button cycles through the sequence:
Master AES Reference
...
Auto-Slave
option (see page 21) is turned
Master/Slave
Page 14
Manual for Software Versions 1.3x to 1.5x
(white
on page 18.
(blue
Down button.
Clk In
Word Clock Master
... ... ... etc.
On
the unit will automatically
button – it moves down the priority list.
Document No: OS-MA-D0002-902.1E1
email to: more@dcsltd.co.uk
web site: www.dcsltd.co.uk
th
12 June 2000
type on the front
type on the front
connector (for
Master/Slave