Studio Technologies 82 - Manual (Page 10)

Issue 1, January 2000 Model 82 User Guide
Page 10 Studio Technologies, Inc.
50/60Hz. In most cases, units shipped to
North America are factory selected for
120V operation. Units bound for Japan are
selected for 100V, while our friends “down
under” and in Europe receive units set for
220/240V. Before connecting the Model 82
to AC mains power, check that it is config-
ured to match the local mains voltage.
Look on the back panel, adjacent to the
power entry connector, for the configured
voltage(s). Note that an incorrect configu-
ration could seriously damage the unit.
Should it be necessary to change the
unit’s operating voltage it must be
performed only at the factory or by an
authorized service technician.
The Model 82 uses an IEC standard con-
nector to mate with the AC mains cord.
The wire colors in the AC mains cord
should conform to the internationally
recognized CEE color code and must
be wired accordingly:
Connection
Wire Color
Neutral (N) Light Blue
Line (L) Brown
Protective Earth (E) Green/Yellow
Safety Warning: The Model 82 does
not contain an AC mains disconnect
switch. As such the mains cord plug
serves as the disconnection device.
Safety consideration requires that
the plug and associated outlet be
easily accessible to allow rapid discon-
nection of mains power should it prove
necessary.
As soon as mains power is connected, the
Model 82’s power present LED will light.
The unit is now ready for years of trusty
service!
Configuration
Input Level Calibration
With the ExactCal calibration section it’s
simple to match the nominal level of the
input signal with the Model 82’s internal
circuitry. Two 15-turn trim potentiometers,
along with four LEDs, form the ExactCal
section. One trim pot is associated with
the left input, the other with the right. Two
LEDs, labeled Lo and Hi, are associated
with each input. They are provided as an
aid to calibration, as well as serving as
“signal present” indicators.
The following is a step-by-step procedure
for using the ExactCal section to match an
input signal to the Model 82's circuitry:
• Set the trim pots to their fully counter-
clockwise position. Remember, the
trim pots are 15-turn type, so you may
have to rotate them up to 15 times
before reaching their fully counter-
clockwise position.
• Supply a 1kHz sine wave to both the
left and right inputs. Set the level of the
source to be precisely the nominal
operating level. If, for example, the
output of a console is connected to
the input of the Model 82, the console
output should be adjusted so that the
meters read 0dB or 100%. If the output
of the console is a “+4-type,” then
setting the console’s left and right
output levels to nominal should find
the console output levels to be exactly
+4dBu.
• Slowly turn the trim pot associated with
the left input in the clockwise direction.
As you increase the level, watch the
LEDs associated with the left channel.