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P-1800 AR OWNER'S MANUAL
6. Clean your P-1800 AR with a damp cloth only. Do not use solvents or abrasive cleaners. Never pour liquid on or into the unit.
7. Your P-1800 AR should be serviced by qualified service personnel when:
• The power supply cord or the plug has been frayed, kinked, or cut.
• Objects have fallen or liquid has spilled into the unit.
• The unit has been exposed to rain or extreme moisture.
• The unit does not appear to operate normally.
• The "Protection OK" indicator is not lit.
• The unit has been dropped, or the enclosure has been damaged.
8. Your P-1800 AR requires that a safety ground be present for proper operation. Any attempt to operate the unit without a safety
ground is considered improper operation and could invalidate the warranty.
9. Do not attempt to service your P-1800 AR beyond what is described in this manual. All other servicing should be referred to quali-
fied service personnel.
INSTALLATION
Because of the toroidal transformer design, the Furman P-1800 AR may be positioned near most other equipment without fear that
the other equipment will be disrupted by leakage of a strong 50/60 Hz magnetic field. Nevertheless, suggested rack locations would be
either at the top or bottom.
As with any rackmount equipment, be sure to use 10-32 machine screws for mounting in the rack's tapped holes (this is not a metric
size). In particular, beware of 10-24 screws, which may fit if forced but which will strip the threads. To avoid marring the front panel
finish, use plastic washers under the screw heads.
OPERATION
Dimmable/Switchable Digital Voltage and True RMS Current Meter:
Furman's laboratory precision AC digital voltmeter continually measures incoming voltages within a typical tolerance of +/-1.5VAC. It
should be noted that the voltage reading is determined by the incoming AC source.
The Furman True RMS Current Meter constantly measures the total circuit AC load, with a typical tolerance of +/-0.5 amp. Because
the meter features True RMS technology, the current readings are accurate regardless of load conditions (capacitive, inductive, or
resistive).
To switch between voltage and current, press the button labeled "Line Voltage/Current". To change the display intensity, hold this but-
ton down for two seconds to cycle through the 3 stages of brightness.
Voltage Range Indicator:
This tri-color Voltage Range indicator is located in the lower left corner of the digital voltage meter lens assembly. When the incoming
AC voltage is within a capture range of 97-137V the tri-color indicator will be green (optimal), indicating the unit is in regulation. How-
ever, if the regulator encounters a temporary transient condition the indicator will turn amber (caution). This amber indication appears
when there are excessive changes or sudden swings at the input (+/-10 volts). If the incoming voltage is outside the capture range
(below 97V or above 137V) the indicator will turn red. Red warnings indicate the incoming voltage is far from optimal and beyond the
capture range offering a constant 120V. In this condition, the P-1800 AR will continue to regulate from the last tap of the autoformer,
providing an output voltage as close to 120V as possible (e.g. an input voltage of 92V would equate to 110V at output). When em-
ploying the P-1800 AR in mission critical applications where 120V is the primary concern, the red indication is invaluable.
Ultra-Low Resistance Magnetic Power Switch / Circuit Breaker:
Furman's Prestige Series 15 amp capacity power switch / circuit breaker is specifically designed to stand up to the enormous high in-
rush current demands of many power amplifiers. Additionally, Furman magnetic circuit breakers are not sensitive to temperature, nor
do they raise the AC impedance as do many less costly thermal breakers. If the 15 amp maximum RMS current capacity of the P-1800
AR is exceeded, the spring tensioned switch will immediately reset to the "Off" position. You will need to switch back to the "On" posi-
tion once the problem is corrected (typically by eliminating one component), or until the RMS current does not exceed 12 amps - 1440
watts.
Total Current Capacity (maximum and minimum load):
The P-1800 AR can handle loads totaling up to 15 amperes as long as the input voltage is equal to or above 124 volts. For voltages
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