m AC voltage stabilizer based on waveform shaping technology m Superior
waveform compensating power m Excellent current capability m Highly
effective interference rejection m Built-in meter allows monitoring of output
power, input/output voltage, and input/output distortion m Elaborate
protection features m Large "Super Ring" toroidal transformer

Tap into a totally clean source of AC energy, free from distortion andhigh-frequency noise. Revolutionary waveform shaping technology
enables highly precise compensation, providing a pure energy sourcewith 230 V AC ±2% (or 120 V AC ±2%). Connect audio or video
equipment for a drastic improvement in sound and picture quality.
Monitor output power, input/output voltage, and input/output distortion
on the built-in meter.
The Clean Power Supply components fromAccuphase are revolutionary products that remove
noise and impurities from the AC power line andimprove signal quality by continually monitoringand shaping the power supply waveform. They
have been widely acclaimed for drastically
improving the sound and picture quality of audio
and video equipment. The PS-1200V is a further
upgraded version of the predecessor model PS1200. The circuitry has been optimized to fulfill

even higher performance demands, and the powertransformer that forms the heart of the system is
now a high-performance type with even moremuscle. Because the PS-1200V is a high-power
version of the PS-500V, a single unit can deliver
enough power to cover the requirements of almost
any high-quality system.
The PS-1200V uses waveform shaping technology
to turn the power from a regular AC outlet into ahighly pure sine waveform for use as a stable andPower supply waveform and PS-1200V output waveform
Almost every electrical device used in an household converts the AC
supplied by the outlet into a DC current for powering its internal circuits.
This task is performed by a rectifier. As shown in photograph , therectifier load current has a pulse waveform with a large current flowing
momentarily in the vicinity of the voltage peak. This causes a voltage
drop, resulting in clipping of the voltage waveform, as shown inphotograph .

PhotoCurrent waveform ofrectified load

A clipped waveform with a high amount of distortion contains many
unwanted frequency components, or harmonics. When passing throughthe PS-1200V, the deformed waveform is restored to its original sine
wave pattern, as shown in photograph .

Photo
Voltage waveform of ACline (distortion approx. 3%)

Frequency spectrum of power line
(photo )Frequency spectrum of PS-1200V
output (photo )Frequency spectrum of power line

PhotoPS-1200V output waveform (distortion approx. 0.2%)

uncontaminated energy source of A/V components.
To achieve this, the PS-1200V constantly monitors
the input voltage waveform and adds or subtracts
exactly the required amount of correction. The
compensation required by this innovative techniquetypically is only a fraction of overall power. ThePS-1200V therefore operates with high efficiency
and produces little heat, allowing it to be designed
as a fairly compact and lightweight unit. Since it
contains no oscillators or switching circuitry, thePS-1200V itself does not act as a source ofspurious high-frequency noise.
AC Voltage Stabilizer Based on Waveform
Shaping Technology
The PS-1200V accepts AC power on the input side,processes it using internal control circuitry, andsupplies it as clean AC power on the output side.
Most of the AC energy from the input is carriedover to the output. The loss introduced by the PS1200V is very small, since it consists only of thepower required for waveform compensation.
Figure 1 shows a block diagram of the unit. The
signal from the secondary winding S1 of the transformer reaches the adding/subtracting circuit andappears at the output as output voltage (e0). A partof the output voltage is routed to the – input of thewaveform comparator for waveform comparison.
The S2 signal from the transformer goes to the reference waveform generating circuit where it becomes the high-precision sine waveform (ei) synchronized to the input frequency of 50/60 Hz. Thissine wave signal is thenrouted to the +input of thewaveform comparator to be
used as a reference signal. By
comparing thetwo input signals, a differential component
is extracted.
Based on thisinformation, theadding/subtracting circuit
can provide exactly the required amountof compensation for turning
the output into ahigh-precisionsine waveform.
Excellent Current Capability
The power amplifier which performs waveformcompensation is configured as a purecomplementary symmetrical circuit using current
feedback for unsurpassed operational stability. Theoutput stage uses transistors rated for a maximum
current of 15 amperes. These devices areconnected in a 20-parallel complementary pushpull arrangement which boasts excellent current
capability.

Superior Waveform Compensating Power
When the input voltage is 220 V (110 V), the voltage
at the secondary side of the transformer will also
be 220 V (110 V). To bring this to 230 V (120 V), 10volts must be added, as shown in Figure 3 (a).
Conversely, if the input is 240 V (130 V), 10 voltsmust be subtracted to yield 230 V (120 V), as shownin Figure 3 (b). In actual operation, the peak valueof 10 V, namely 14.1 V is added or subtracted.

Comparing a precise sine wave synchronized tothe input frequency with the output voltage yields
a compensation waveform which is imposed on
the output voltage. Consequently, for an input
voltage range of 200-253 V AC (108-132 V AC)
and a constant load, the output voltage is kept
constant at 230 V ±2% (120 V ±2%), with amaximum distortion ratio of 0.3%. These values
demonstrate the outstanding wavefor mcompensation ability of the PS-1200V.
Note:
The above explanation is for the 230 V AC versionof the PS-1200V. Figures in brackets refer to the120 V AC version.
Multiple Protection System Assures Total
Operation Safety
When a problem occurs during operation, thecircuit breaker integrated in the power switch
immediately shuts off the power, to protect the unit

and any connected components.
= When input current overload occurs, such as
when the output is short-circuited, the power isshut off.
> In case of momentary power overload, such ascaused by inrush current when a component isswitched on or when a power amplifier
reproduces a peak passage in the music, acurrent limiter becomes active.
? When DC voltage is detected in the output or
when the output voltage exceeds the maximum
rating, the output is switched off to protect
connected components.
@ When the temperature of theinternal heat sinkor power transformer exceeds
110°C, the circuitry is automatically shut down.
Assembly with protection circuitryn Assembly with 20-parallel pushpull output transistors, waveformcompensation amplifier for addition/subtraction, comparator for
reference waveform and output
waveform, etc.

n Assembly with reference waveformgenerator etc.

(The photograph shows the230 V AC version.)

Highly Effective Interference Rejection
The input side of the PS-1200V is equipped with aline filter for removing any high-frequency noise
components present in the power line, such as
those generated by digital equipment. The primaryand secondary windings of the power transformer
are kept totally separate, and the fully shielded
design shuts out any externally induced noise.
Since the PS-1200V uses the AC feedback
principle, output impedance is extremely low. This
prevents any possibility of mutual interference
between components connected to the outputs ofthe PS-1200V.

n FRONT PANEL

Built-in Meter Allows Monitoring of Output Power,
Input/Output Voltage, Input/Output Distortion.
Overload is Indicated by Flashing Meter Illumination.

Strong Power Supply With Large "Super Ring"
Toroidal Transformer and High Filtering
Capacity

The meter of the PS-1200V lets the user see at a
glance how much power (VA) the connected equipment is consuming at any given time. This is especially helpful for components such as integrated
amplifiers or power amplifiers whose power consumption differs considerably depending on thevolume setting andactual music signal. When themaximum output
power rating is exceeded, the meter
illumination flashes
as a warning indication.

The power transformer plays a vital role in any
power supply. The PS-1200V uses a large toroidal
type rated for 1500 VA. Toroidal power transformers
have large-gauge copper wiring on a donut-shaped
core, resulting in very low impedance and highefficiency.

Assembly with input voltage/distortion monitoring circuitry(The photograph shows the 230 V AC version.)
Meter of 120 V
AC version

Power Meter Indication and Load
The power consumption of electrical equipment, as indicated on the equipment itself and in catalogs
and other documentation, is usually given in watts (W). This figure represents the so-called effective
power which is stated according to legal requirements. However, the actual power drawn by theequipment is larger than the effective power. This is called the apparent power which is calculated
by multiplying the applied voltage (230 V or 120 V) with the actual current. The unit for apparent
power is VA (volt-ampere).
Since the value shown by the power meter of the PS-1200V in the "VOLT-AMPERE" position is theapparent power, the reading will be higher than the power consumption (W) given in catalogs andspecification sheets.

★
Output connectors of120 V AC version★

m

The rated power limit of the PS-1200V is 1200 VA for the 230 V AC version and 1000 VA for the 120
V AC version. When deciding on equipment to be connected, power consumption figures given incatalogs and the like can be used for a general estimate, but actual power consumption should bechecked using the meter.

mThe power consumption of integrated amplifiers and power amplifiers varies considerably dependingon the actual audio output. After connecting such equipment, perform playback and verify that power
consumption does not exceed the maximum rating when peaks in the music are reproduced at highvolume levels.

mIn case of overload, the meter illumination flashes. Reduce the load by reducing the number ofconnected components until the illumination stops flashing and stays constantly lit.

n REAR PANEL(The photograph shows the 230 V ACversion.)★

PS-1200V Guaranteed Specifications
230 V version
Outputconnectors of
120 V AC version

1200 VA (continuous)

Rated output voltage

230 V AC ±4.6 V

120 V AC ±2.4 V

Rated output current

5.2 A

8.3 A

Output frequency
Instantaneous peak current capacity
Rated input voltage

60 A Power switch/circuit protector

230 V AC

Meter (Output power, input/output voltage,input/output distortion)★

$AC power connector(for supplied power cord)★

! Meter operation selector
VOLT-AMPERE VOLTAGE INPUT/OUTPUTDISTORTION INPUT/OUTPUT
Remark★ The 230 V AC and 120 V AC versions of the PS-1200V differ regarding meter voltage indication, AC
output connector shape, supplied power cord, etc. Make sure that you have the correct version.

RCaution

120 V AC
50 Hz or 60 Hz

No-load power consumption

60 W

Cooling principle"# Output connectors (AC outlets)★

120 A
0.3% or less

Input frequency★

1000 VA (continuous)

50 Hz or 60 Hz (identical to input frequency)

Output waveform THD

The usable power supply
voltages are indicated.

120 V version

Rated output capacity

Natural air coolingMeter.............................................................................................................................................................................................
0 – 1200 VA

VOLT-AMPERE
The meter illumination flashes when an overload occurs.............................................................................................................................................................................................
VOLTAGE INPUT/OUTPUT(green zone of scale)

230 V AC ±5%120 V AC ±5%.............................................................................................................................................................................................

DISTORTION INPUT/OUTPUT

0 – 6%

Dimensions

475 mm (18-11/16”) width,
242 mm (9-1/2”) height,
508 mm (20”) depth

Weight38.4 kg (84.7 lbs.) net
48 kg (105.8 lbs.) in shipping carton★ The PS-1200V is available in 230 V AC and 120 V AC versions. The actual allowable voltage is indicated next to the AC power connectors
on the rear panel. Be sure to check this indication before using the PS-1200V.
★ This product can be used only on a regular household AC circuit rated for 230 V or 120 V AC, 50/60 Hz. Using the product with portable
AC generators, airplane or ship power generators or other types of power sources is not possible.
★ This product is designed to improve the quality of AC power supplied to audio or video components. Do not use it to power industrial typeequipment or common household electrical appliances.
★ Do not use this unit for powering equipment where failure incurs a risk of injury or fatal accidents (medical equipment, aviation equipment,
traffic control equipment, furnace and heating control equipment, safety devices, etc.)
Accupahse will not be liable for any problem occurring due to use of the PS-1200V with the above type of equipment.

Supplied accessories: • AC power cordÛSpecifications and design subject to change without notice for improvements.

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