Balanced AC Power Isolation Transformer, 30A
Owner’s Manual
1-9843
960129-2332
Furman Sound, Inc.
1997 South McDowell Blvd.
Petaluma, California 94954-6919 USA
Phone: 707-763-1010
Fax: 707-763-1310
Web: http://www.furmansound.com
E-mail: [email protected]
Introduction
Thank you for your purchase of a Furman IT-1230 30 Amp
Balanced AC Power Isolation Transformer, and congratulations
on your choice. This specially wound and shielded toroidal
isolation transformer is designed specifically to reduce hum pickup
by sensitive equipment when ultra-low-noise is a must.
F e a t u r e s
●
Provides precisely balanced AC power for ultra-low-noise
installations
●
Typically gives a 16 dB improvement in background noise floor
in systemwide installations
●
Toroidal transformer with center-tapped secondary is the most
efficient, compact design, with least magnetic field leakage
●
Soft Start circuit prevents turn-on transients and high inrush
currents
●
Faraday shield reduces electrostatic coupling between primary
and secondary
●
Extreme Voltage Shutdown circuit protects against dangerously
high or low input voltages
●
Microprocessor-controlled “smart” AC voltmeter monitors line
voltage, flashes alerts for marginal and extreme conditions
●
Provides basic power conditioning functions (spike
suppression, RFI filtering)
●
Ground fault interrupter (GFCI) protection
Description
Designed for the most critical, ultra-low-noise installations,
the IT-1230 can supply 30 amps of balanced AC power
to a recording studio, video or film production facility, broadcast
station, etc. Its purpose is to drastically reduce hum and buzz
caused both by ground currents from power supply filtering and
by radiation from supply cables into sensitive signal sources like
guitar pickups, tape heads and microphones. Its effect is
startling! It not only dramatically reduces the noise floor but also
noticeably improves dynamic range and sonic clarity.
The IT-1230's heart is a specially wound and shielded
toroidal isolation transformer with a center-tapped secondary. It
is housed in a 3-unit (5.25" high) rack mount chassis. The back
panel provides a 30-amp twistlock inlet and outlet, plus ten 20A
balanced Edison outlets, widely spaced with plenty of clearance
for “wall warts”; the front panel provides two more outlets. An
IT-1230 can be installed in minutes, though you may require some
help in choosing and wiring an appropriate supply cable. The
IT-1230 provides clean and completely safe power—there is no
need to “lift grounds” or compromise the integrity of safety ground
wires to achieve hum reduction.
Special features include an accurate, self-checking AC
voltmeter that not only measures normal voltages, but also flashes
eye-catching special pattern alerts for off-scale but not extreme
conditions (80-90 or 130-140 volts); an Extreme Voltage
Shutdown circuit to cause a protective shutdown if the unit is
exposed to dangerous voltages (like accidental connection to
220V); and a special “Soft Start” circuit to prevent the large in-
rush surge currents and spikes that would otherwise occur at turn-
on and turn-off with such a large transformer.
MODEL IT-1230
