ART pr8 pro User Manual

 

 
 

 

 

             

  

 
 

 
The PR8 PRO regulates incoming AC line voltages to deliver clean and stable power to your system for optimum operation and longer life. Output voltage at any 
of the 8 rear AC outlets is maintained within 5 Volts of 117 Volts even as the incoming AC line varies from 97 to 137 Volts. Extreme voltage shutdown protection, 
Advanced Power Filtering, and fast acting breaker, protect your system while the front panel LCD display gives you a constant read of the input and output line 
voltages. The PR8 PRO is designed to protect a wide range of equipment from sensitive vintage tube amplifiers to large displays or digital systems. Your 
equipment will sound and work better and live longer. 
 
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Maintains 117VAC (+/-5VAC) when AC input is between 97 and 137VAC  

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Output In Regulation LED indication 

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Extreme voltage shutdown if input >140V or <80V 

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LCD AC line input and output voltage display 

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Front panel unswitched and unregulated output 

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1800 Watt total power capacity 

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Front panel master breaker and power switch 

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EMI and RFI filtering 

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Surge and Spike Protection   

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Very low stray magnetic field leakage 

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Multitap toroidal autoformer design 

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1.75”(165mm) high x 19.0”(482mm) wide x 11.5”(292mm) deep 

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14.6 lbs. (6.6kg) 

 
 

 
POWER SWITCH 
The PR8 PRO has a master POWER switch for the rear outlets. This switch glows when the unit is on. 
 
OUTPUT IN REGULATION 
The OUTPUT IN REGULATION LED on the front panel is on whenever the output AC voltage is within the normal regulated range of 117 Volts (+/- 5 Volts). The 
PR8 PRO regulates the AC output voltage so that this light will remain lit even as input voltages vary from 97 to 137 Volts. If this LED is off it means that the 
input AC voltage is either below 97 Volts or above 137 Volts and the regulator is still increasing or reducing output voltage but cannot maintain the 117 Volt 
output.  
 
EXTREME VOLTAGE SHUTDOWN 
If input AC voltage ever drops below 80 Volts or exceeds 140 Volts this LED will come on and the rear outlets will immediately shutdown to protect any 
equipment that may be attached. Once the AC input voltage returns to normal, the LED will turn off and the rear outlets will automatically return to their regulated 
voltage. 
 
MULTITAP TOROIDAL AUTOFORMER DESIGN 
The PR8 PRO uses a design based on an eight-tap toroidal autoformer. The toroidal design assures minimal magnetic stray field leakage, and, because of its 
high efficiency, a very compact size for its rating. The PR8 PRO circuitry monitors the incoming line voltage with each cycle, comparing it to an internal voltage 
reference. If an incoming voltage fluctuation requires that a different tap be selected, the new tap is electronically switched at zero-crossing, to avoid distorting 
the AC waveform. If necessary, the PR8 PRO can switch taps as often as once each cycle. Most commercial voltage regulators using multiple-tapped 
transformers switch taps at uncontrolled times, thereby creating voltage spikes and clicks that can leak into the audio. Hysteresis in the switching circuits avoids 
“chatter” or unnecessary switching back and forth between adjacent taps. Unlike voltage regulators that employ ferro-resonant transformers, PR8 PRO is not 
sensitive to slight errors in the AC line frequency, making it ideal for use with portable generators. 
 
LCD 
The LCD display on the front panel monitors the AC line input voltage and the regulated AC output voltage that the PR8 PRO is supplying. 
 
MAXIMUM LOAD 
The eight circuit breaker protected outlets are rated at 15 amps total, which is equivalent to 1800 watts at 120 volts.  If the total current coming into the PR8 PRO 
exceeds 15 amps, the circuit breaker on the front panel will trip, cutting off power to all outlets.  If this happens, reduce the overall load by unplugging one or 
more units from the PR8, then push the circuit breaker button in to reset it.