aR-20 II Voltage RegulatoR / poweR condItIoneR
5. Clean the AR-20 II with a damp cloth only. Do
not use solvents or abrasive cleaners. never
pour any liquid on or into the unit.
6. When left unused for a long period of time,
the power cord of the AR-20 II should be
unplugged from the outlet.
7. The AR-20 II should be serviced by qualified
service personnel when:
a. The power supply cord or the plug has
been frayed, kinked, or cut.
b. Objects have fallen or liquid has spilled
into the unit.
c. the AR-20 ii has been exposed to rain or
other moisture.
d. the AR-20 ii does not appear to operate
normally or exhibits a marked change in
performance.
e. The AR-20 II has been dropped, or the
enclosure damaged.
8. The AR-20 II requires that a safety ground be
present for proper operation. Any attempt to
operate the AR-20 II without a safety ground
is considered improper operation and could
invalidate the warranty.
9. there are no user serviceable parts in the
AR-20 II. Refer servicing to qualified service
personnel only.
Voltage Regulation
Furman Voltage Regulators are intended to
protect sensitive electronic equipment from
problems caused by AC line voltage irregu-
larities—brownouts or overvoltages that can
cause audio tonal changes, digital equipment
malfunction (such as loss of Midi programs or
other data), or, in extreme cases, permanent
damage. they accept input voltages over a
wide AC voltage range and convert them to a
steady, stable output at the desired standard
voltage, plus or minus five volts. Voltages ap
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proximately ±10% beyond that range may be
converted to usable levels, depending on the
requirements of the equipment. This stable
voltage protects equipment and allows optimal
performance. see graphs on the back page.
The AR-20 II has twelve outlets on the rear
panel, and two convenience outlets on the front
panel. All are functionally interchangeable. the
outlets are regulated, surge-suppressed, and
linearly filtered, making the unit a full-function
power conditioner. The AR-20 II has no con
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trols except an on-off switch / breaker and the
button to switch the meter between voltage and
current readings.
Note: The AR-20 II is for use with AC voltage
only. DC voltages should never be applied to
them. Also, it does not change or regulate line
frequency. The output frequency will always be
the same as the incoming frequency.
smp+
(series multi-stage protection plus)
traditional surge suppression rely on circuits
that “sacrifice” themselves when exposed to
multiple transient voltage spikes, requiring the
dismantling of your system, and repair of your
surge suppressor. Not so with SMP+. With
Furman’s SMP+, damaging transient voltages
are safely absorbed, clamped, and dissipated.
No sacrificed parts, no service calls, no down
time.
Unique to Furman’s SMP+ is its unparalleled
clamping voltage. while other designs offer
clamping voltages that are well above 330 Vpk,
Furman’s SMP+ clamps at 188 Vpk, (133 VAC
RMs). this unprecedented level of protection
is only available with Furman’s SMP+ technol
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