PAGE2
The Voltage Regulator is intended to protect sensitive electronic equipment from problems caused by AC line voltage
irregularities-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 (see table on page 2) and convert them to a steady, stable output at the desired standard voltage, plus or minus five
volts. Voltages approximately ±10% beyond that range may be converted to usable levels, depending on the requirements of
the equipment.
The PR-1V has eight convenience outlets on the rear panel, and one on the front panel. All are functionally interchangeable.
The outlets are regulated, spike suppressed, making the unit a full-function power conditioner. The PR-1V has no controls
except an on-off switch.
Note: The PR-1V is for use with AC voltage only. DC voltage should never be applied to it. Also, it does not change or regulate
line frequency. The output frequency will always be the same as the incoming frequency.
MAXIMUM AND MINIMUM LOAD
The PR-1V can handle load totally up to 15 amperes as long as the input voltage is equal to or above 110 volts. For voltage
below that level, its capacity must be derated at approximately 113 milliamperes per volt. As a practical matter, therefore, to
cope successfully with worst-case brownout conditions, you should plan your total load so that it does not exceed 15 amps, or
1800 watts. Please note that this refers to the aggregate power requirement of all equipment plugged into the voltage regulator,
not to each individual item.
NOTE: While there is no minimum load requirement for the PR-1V, you may experience an audible mechanical hum coming
directly from the unit when the power switch is on with nothing plugged in. This effect will disappear as soon as you plug in an
equipment drawing 40 to 50 watts total.
DEFINITIONS
VOLTAGE REGULATION: The AC line voltage is a number indicating the nominal electrical potential that has been adopted in
a region for powering electrical equipment of all kinds. In the countries of 110 volts AC, the actual voltage can fall below or rise
above this nominal level due to brownouts, power cutbacks, use of substandard wiring, and other causes. These deviations can
cause poor performance or a malfunction. A regulator is a device which, through use of a transformer, corrects the voltage
deviation by stepping it up or down so that it is as close as possible to the nominal level.
SPIKE: A pulse of energy on the power line. Spikes can have voltages as high as 6000 volts. Though they are usually of very
short duration, the energy they contain can be considerable, enough to damage sensitive solid-state components in audio and
computer equipment. Spikes can also foul switch contacts and degrade wiring insulation. They are an unavoidable component
of electric power. They are used unpredictably by electric motors switching on or off (on the premises or outside), utility
company maintenance operations, nearby lightning strikes, and other factors. Spikes (also called surges or transients) are
absorbed by special components called MOV’s in the PR-1V to provide safe voltage levels to protect your equipment..
ADVANCED POWER FILTERING: Noise from Electro Magnetic Interference involves lower voltages and less energy than is
found in spikes, but it is continuous rather than transient in nature. It is not likely to cause physical damage, but it can certainly
be annoying, producing static in audio circuits, “snow” on video screen, or garbled data in computers. Noise can be introduced
into AC lines by certain kinds of lighting, electric motors and others. Because noise occurs at higher frequencies than the 50 or
60 Hz AC line, it can be effectively reduced through use of low-pass filtering.
P R O F E S S I O N A L A U D I O
PR-1V
NOMINAL OUTPUT VOLTAGE VS. INPUT “IN-REGULATION” RANGE:
