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FM-531HD / May 2013
G E N E R A L I N F O R M A T I O N
The FM‑531HD does not need nor does it have top or bottom cover ventilation
holes. Cooling is accomplished via cooler air drawn into vertical slots positioned lower
in the side panels which allows latent heat rising by natural convection to exit slots in
the top of the rear panel.
The FM‑531HD may be mounted between other devices in the equipment rack;
however, in accordance with good engineering practice it should not be mounted directly
above devices that generate a significant amount of heat (such as power amplifiers or
power supplies). If such a location is unavoidable, then it is advisable to utilize an
extra 1RU blank rack panel between the FM‑531HD and devices immediately above
and/or below it.
WARNING!
With very few exceptions, the FM-531HD chassis DOES NOT need to be
opened in the field.
Please be advised that the unit contains high voltage power supply circuits
operating at voltages well above AC line input.
These voltages are not only hazardous but also potentially deadly if acciden
-
tally contacted.
There are no user-serviceable parts inside the unit, and it should be returned
to Wheatstone Corporation under a Return Authorization should repair ever
become necessary.
FM-531HD Installation Tips
Grounding
Establish a low impedance common ground in the facility and try to route all
equipment grounds to that point, using conductors with the largest possible surface
area while keeping those leads as short as possible. The audio processor’s ground
reference (its chassis) should be connected to the station ground. Such a connection
is especially important when this hardware is operated in a high RF environment
because it helps minimize differential voltages between the processor’s chassis and
other pieces of equipment.
Surge Protection
Always place surge protection circuits as close as possible to the device being
protected. AC power line surges should be handled in a way that keeps instantaneous
potential differences between the power line hot, neutral, AC grounding conductor,
the station ground and the processor chassis as low as possible. Likewise, measures
should also be taken to keep the instantaneous potential difference between the audio
cable shields and the processor chassis as low as possible (this applies to all audio
equipment, not just the FM‑531HD), particularly when the equipment is located within
the electrically hostile environment of a station’s transmitter facility.
Summary of Contents for FM-531 HD
Page 2: ...Technical Manual Wheatstone Corporation May 2013 FM HD Digital Audio Processor FM 531hd...
Page 122: ...page A 2 FM 531HD May 2013 A P P E N D I C E S Appendix A General Specifications A 3 Contents...
Page 128: ...page A 8 FM 531HD May 2013 A P P E N D I C E S Appendix B FM 531HD GPI Interface A 9 Contents...