Studio Technologies 41 2013 - Manual (Page 12)

Issue 3, November 2013 Model 41 User Guide
Page 12 Studio Technologies, Inc.
AC Mains Power
The Model 41 operates directly from AC
mains power over the range of 100 to
240 V, 50/60 Hz. Being a “universal input”
device, there are no switches to set or
jumpers to install to match a location’s
nominal AC mains voltage. The Model 41
uses a 3-pin IEC 320 C14 inlet connector
to mate with a detachable AC mains cord.
All units are supplied with an AC mains
cord that has a North-American (NEMA
5-15P) standard plug on one end and
an IEC 320 C13 connector on the other
end. Units bound for other destinations
require that the appropriate cord set be
obtained. The wire colors in the AC mains
cord should conform to the internationally
recognized color code and be terminated
accordingly:
Connection
Wire Color
Neutral (N) Light Blue
Line (L) Brown
Earth/Ground (E) Green/Yellow
Safety Warning: The Model 41 does
not contain an AC mains disconnect
switch. As such, the AC mains cord
plug serves as the disconnection
device. Safety considerations require
that the plug and associated inlet be
easily accessible to allow rapid dis-
connection of AC mains power should
it prove necessary.
As soon as AC mains power is applied
the Model 41 will begin its power-up
sequence. As a “boot-up” indication
each of the front-panel LEDs will light in a
processor-controlled sequence. After that
has completed one of the status LEDs will
remain lit. The unit is now fully operational.
Post-Installation
Audio Input Source Level
Adjustment
It’s important to confirm and, if required,
adjust the level of the audio sources that
are connected to the Model 41’s audio
inputs. The monitor section’s dual 5-seg-
ment LED level meters will help make this
task simple. Begin by using the pushbutton
switch, located on the front panel, to select
the IFB output that is going to be calibrated.
Adjust the source levels so that the four
green LEDs light when typical audio signals
are present. The desired nominal output
level of the IFB outputs is –10 dBu. This is
reflected in the top green LED being cali-
brated to, and labeled, –10. The meters’
yellow LEDs, labeled –4, should light infre-
quently, generally only when signal peaks
are present. Achieving a precise level cali-
bration is not critical. But getting the levels
within the optimum range is very important!
It’s likely that the initial levels provided by
analog ports on a digital matrix intercom
system won’t be an exact match with the
Model 41’s audio inputs. This shouldn’t
pose a problem as the computer control
available on contemporary intercom sys-
tems should make level adjustment very
simple. From our research we found that
the Clear-Com Eclipse™ system speci-
fies a nominal level of 0 dBu. Since their
headroom is listed as greater than 18 dB,
increasing the nominal level of their analog
output ports by 4 dB (to achieve the desired
+4 dBu) should be acceptable. RTS in
their ADAM™ and ZEUS™ systems specify
nominal output levels of +8 dBu. With these
systems correct Model 41 performance
would be provided by reducing the ports’
output levels by 4 dB. With the Artist™