Studiomaster Powerhouse Vision 700 serie Bedienungsanleitung Seite 17

Powerhouse 700/1200 Operator Guide
What does the CE mark mean ? The CE mark has been introduced within the European Union as an indication that products
conform to relevant European Directives. There are currently two Directives covering electrical and electronic products. From the
1st of January 1996 all such products must meet the requirements of the EMC Directive 89/336/EEC and from the 1st of January
1997 they must also meet the requirements of the Low Voltage Directive 73/23/EEC.
The so-called 'Low Voltage' Directive covers electrical safety for products connected to the domestic electricity supply and is
relatively self explanatory. In our case it means that this equipment has been designed, manufactured (and from 1st January 1997
independently tested) for compliance with the electrical safety standard EN 60065. This standard is identical to the British standard
BS 415 and is similar to the international standard IEC 65.
The requirement for Electromagnetic compatibility (or EMC for short) stems from the European Directive 89/336/EEC which
requires that equipment should not generate interference that would be likely to cause other equipment to malfunction, and should
also have an adequate level of immunity from interference itself. Similar regulations covering interference generated by computers
have existed in the United States for over a decade, known as the FCC Rules (part 15 - subpart J - computing devices). The
concepts are similar, although the U.S. rules do not cover immunity.
This equipment has therefore been tested to recognised EMC standards. The exact standards used are listed in the declaration of
conformity. Different types of equipment may use different standards. Please note the Directive requires only what is called an
'adequate' level of immunity. It does not mean that your equipment will be totally unaffected in all possible situations.
As part of the requirements of the Directive we are obliged to explain the effects that may be observed.
Immunity If this equipment is operated in environments with unusually high levels of emissions from other equipment, its
performance may be degraded. Due to the large number of variables possible in the usage of this equipment and its control
settings; it is impossible to define the exact degradation that may occur in every possible situation.
For your guidance these are the effects of the tests in what we consider to be typical operating situations.
Susceptibility to 'fast transients' on the a.c. power and signal connections and to electrostatic discharges :
- Results in small clicks or pops ; operation otherwise unaffected.
Since these events are usually infrequently encountered the resulting clicks should not give cause for concern. High levels of mains
transients may be caused by defective equipment. This may be determined by switching them off and on. Typical causes of
transients on the mains are products containing thermostats such as heating controllers and refrigerators. Excessive clicks from
such products may indicate a faulty or worn out thermostats. We would suggest replacement of any such defective part. If such
remedial action is still unsuccessful then it may be possible for a competent electrician to add a contact suppressor.
If however you have an electricity supply which has a high and regular level of transients that appear to be unexplainable, we
suggest that you contact your electricity supply authority. We know of instances where interference to domestic supplies has (for
example) been caused by defective street lighting. Finally if all else fails you may wish to add an external filter which may be
obtained from electrical retailers. Susceptibility to radio frequency fields (3V/m) : Result depends on products and test frequency.
- Power amplifiers and powered mixers - no audible degradation observed.
Degradation only occurs at 'spot' frequencies, so, unless the product happens to be located near a transmitter radiating at exactly
that frequency no degradation will occur. If affected, improvements can be made to minimise the reduction in performance by one
or more of the following :
Relocation of the product, even to another room can be sufficient.
Check the quality of the ground connection to the product.
Determine the source of the interference by switching off and on other electrical and electronic products in the vicinity.
any interfering product to a more distant location.
Check quality and condition of interconnecting cables. (See General section at the end of this document.)
Fit partial or complete R.F. screening (known as a Faraday cage) to the room in which the product is used.
In practice we are confident that you are unlikely to encounter any problems in normal everyday use.
Emissions In practice most audio equipment is incapable of generating harmful interference unless it is misused or a fault
exists. However products containing microprocessors or other digital systems such as DSP reverb modules operate at radio
frequencies and may 'leak' some of this energy into the environment.
This product has been tested for compliance with established standards. However as with immunity this does not mean that this
product will not cause interference with other equipment under all circumstances (especially broadcast receivers). Similar
guidelines to those for immunity apply for the minimisation of interference. Additionally if you believe that the product is causing
interference to radio or television reception, which can be determined by turning the equipment off and on, you may be able to
correct the interference by one or more of the following measures.
- Relocate or reorient the receiver's aerial.
- Connect receiver to a different A.C. mains outlet.
General In order to minimise the possibility of interference we recommend the following :
XLR style connectors should have the screen connected to the shell of the connector as well as pin 1. Note that some XLR
connectors do not have the shell connection available on a solder tag. XLR connectors providing this connection are available from
several manufacturers including the following: Neutrik, Switchcraft, Deltron.
It is important that high quality screened cables are used for all signal connections. Note that low cost screened cables
may have inadequate poor quality screening which does not fully cover the internal wires. Screened cable which relies on
conductive plastic screening also has poorer R.F. characteristics. It is advisable to use cable that has full coverage lapped copper
screening. We used Klotz Professional Microphone Cable in our EMC tests. Speaker connections can use unscreened cable.
Avoid unnecessarily long runs of cable when interconnecting equipment.
Use balanced connections wherever possible.
Don't place sensitive equipment directly next to units with large power transformers such as amplifiers.
Personal computers, monitors and associated peripherals may cause interference, especially older equipment.
In particular we suggest locating video monitors a prudent distance from any sensitive signals.
- Increase separation between equipment and receiver.
- Consult your dealer or an experienced radio/TV technician.
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