IT-20 II - Owner’s Manual F e at u r e s • Ultra-low noise balanced isolation transformer provides over 80 dB of common noise reduction form 20Hz - 20kHz, assuring the lowest noise floor possible for today’s sensitive recording equipment • Toroidal transformer assures contained magnetic field, allowing any component to operate in close proximity without inducing noise • GFCI protected outlets with Ground Lift switch to eliminate AC hum and ground induced noise • Furman’s Linear Filtering Technology (LiFT) p
IT-20 II - Owner’s Manual Introduction Thank you for your purchase of a Furman IT20 II 20 amp Balanced Power Conditioner, and congratulations on your choice. This specially wound and shielded toroidal isolation transformer is designed specifically to reduce hum pickup by sensitive equipment when ultralow-noise is a must.
IT-20 II - Owner’s Manual O p e r at i o n Circuit Breaker/Switch The IT-20 II has a large black switch on the front panel that is both a precision circuit breaker and an on-off switch. If circuit breaker is tripped, manually reset the unit by turning it off and then back on, to restore power. Ground Fault Interrupter (GFCI): The GFCI on the IT-20 II’s front panel is a special kind of circuit breaker that detects an imbalance in the current flowing in the two hot legs.
IT-20 II - Owner’s Manual practices established over a century ago, when electric power use was limited to lighting and motors, long before any AC noise sensitive applications existed. The emphasis then was on convenience (from the power utilities’ standpoint) and safety, but not noise cancellation. The result was a three-wire distribution scheme in which 120V branch circuits have a hot wire and a neutral wire, with the neutral tied to a third wire connected for safety to an earth ground.
IT-20 II - Owner’s Manual protection is only available with Furman’s SMP+ technology. • The power supply cord or plug has been frayed or cut • Objects have fallen or liquid has spilled into the unit Extreme Votlage Shutdown (E.V.S.) When voltage rises to extreme levels because of a lost neutral line or an accidental connection to 208 or 240 VAC, Furman’s Extreme Voltage Shutdown kicks in, automatically powering down all equipment quickly and safely to prevent damage from occurring.
IT-20 II - Owner’s Manual the claimed defects. If the defects are of such type and nature as to be covered by this warranty, Manufacturer shall authorize Purchaser to return the Product to the Furman factory or to an authorized Furman repair location. Warranty claims should be accompanied by a copy of the original purchase invoice showing the purchase date; this is not necessary if the Warranty Registration was completed either via the mailed in warranty card or on-line website registration.
SPEC I F I CAT I ONS AC Current Output: 20 Amps (2400 watts at 60/120V) Shutdown Voltage: At 135-140 VAC Inlets: Heavy duty power cord with 20A three-pronged plug Outlets: 12 rear (isolated), 2 front (GFCI) each rated at 20 amps Spike Protection Modes: Line to neutral, zero ground leakage Spike Clamping Voltage: 188 Vpk @ 3,000 amps, 133 VAC RMS (Tested to UL-1449 6,000 Vpk @ 3,000 amps) Response Time: 1 nanosecond Maximum Surge Current: 6,500 amps Differential Noise Attenuation: 10dB @ 10kHz 40 dB @ 100 kH
