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Introduction
Thank you for your purchase of a Furman IT-1 220 20 Amp Balanced 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.
Features
• Provides precisely balanced AC power for ultra-low-noise installations
• Typically gives a 16 dB improvement in background noise floor in system wide
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-1220 can
supply 20 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 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-1220'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 12 balanced outlets, widely spaced 'with plenty of
clearance for "wall warts"; the front panel provides two more. An IT-1220 can be
installed in minutes without need for an electrician. It 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 inrush surge currents and spikes that would otherwise occur at
turn-on and turn-off with such a large transformer.
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Summary of Contents for Furman IT1220
- Page 1 Introduction Thank you for your purchase of a Furman IT-1 220 20 Amp Balanced 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.
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Page 2: Installation
Background In much the same way that balanced audio lines can reduce the pickup of hum and other types of electromagnetic interference (EIVII), the use of balanced AC power lines in sensitive audio, video, or computer installations can make an enormous difference in system noise. -
Page 3: Operation
If you are installing the IT-1220 in a rack that has rear as well as front mounting rails, you may wish to order adjustable rear rack ears from Furman. They allow the IT-1220 to be securely attached both in front and in back. Order model RRM-... - Page 4 If you frequently move your rack to different locations, derive power from generators, use long extension cords, travel internationally, or are in an area prone to brownouts, you may benefit from the use of one of Furman's AC Line Voltage Regulators.
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Page 5: Limited Warranty
This warranty applies only to the original owner and is not transferable. Also, it does not apply to repairs done other than by the Furman factory or Authorized Repair Stations. This warranty may be cancelled by Furman at its sole discretion if the IT-1220 unit has been subjected to physical abuse or has been modified in any way without written authorization from Furman. - Page 6 Balanced AC Power Isolation Transformer, 30A 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.
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Page 7: Line Voltage
If you are installing the IT-1230 in a rack that has rear as well as front mounting rails, you may wish to order adjustable rear rack ears from Furman. They allow the IT-1230 to be securely attached both in front and in back. Order model RRM-2. - Page 8 Furman’s AC Line Voltage Regulators. NOTE: Because the voltmeter reads the input voltage BEFORE the circuit breaker/on-off switch, its LEDs stay on when- ever the IT-1230 is plugged in, even when the power switch is off.
- Page 9 Also, it does not apply to repairs done other than by the Furman factory or Authorized Repair Stations. This warranty may be cancelled by Furman at its sole discre- tion if the IT-1230 unit has been subjected to physical abuse or has been modified in any way without written authorization from Furman.