Studio Technologies 742 2005 - Manual (Page 10)

Issue 2, May 2005 Model 742 User Guide
Page 10 Studio Technologies, Inc.
Model 742
Reference Tone Frequency
From the factory the frequency of the
reference tone is configured to be 400 Hz.
This is a nice alternative to the more typi-
cal 1 kHz, a frequency which can soon
become very annoying to a listener’s ears.
In most cases 400 Hz will be perfectly
acceptable, and actually preferred. But in
those situations where 1 kHz is necessary,
two configuration jumpers are provided to
shift the frequency range so that the oscil-
lator circuitry can be calibrated for 1 kHz.
Configuration Wrap-Up
If it is determined that any configuration
changes are required, they should now be
performed. For specific details on how to
make configuration changes, refer to the
Technical Notes section of this guide. The
details provided should make the process
simple and relatively painless.
It’s highly recommended that a Model
742’s actual configuration be confirmed
prior to installation. Even factory-fresh
units can “mysteriously” end up having
their default configurations changed prior
to actual installation. The same “gremlin”
that borrows (and doesn’t return) tools,
drinks your favorite soda that you left in
the tech-shop refrigerator, and pulls impor-
tant patch cords has been known to sneak
inside equipment and revise settings!
Installation
In this section, the Model 742 will be
installed in an equipment rack. Audio
input and output connections will be
made using the Model 742’s XLR-type
connectors and ¼-inch 3-conductor jacks.
As a final step AC mains power will be
connected.
System Components
The shipping carton contains a Model 742
Audio Mixer and user guide. Units destined
for North America and Japan also include
an AC mains cord. Your dealer or distribu-
tor will provide an AC mains cord for non-
North American destinations.
Locating the Unit
Now that the Model 742’s configuration has
been reviewed and, if required, revised,
the unit can be mounted in an equipment
rack. Physical access and viewing angles
are the primary issues to be considered
when choosing a mounting location. By its
very nature as an audio mixer, an operator
will need easy access to all the controls.
A good sight line to the LED level meters,
located on the right side of the front panel,
is also important.
As a device that contains high-gain audio
stages, hum, and noise pickup is possible
by way of the chassis and associated ca-
bling. Locating the unit away from devices
that radiate strong AC fields is an excellent
idea. While not likely, it is also possible that
the Model 742’s toroidal power transformer
could radiate energy into adjacent equip-
ment. Located on the far right side of the
unit it may need to be physically isolated
from sensitive equipment such as video-
tape recorders.
During normal operation, access to the
Model 742’s back panel is not required.
However, there is one trim potentiometer
that may need to be adjusted prior to the
Model 742 going into service. This trim pot
sets the level of the reference tone direct
output. Please refer to the Post-Installation
Calibration section of this guide for details.