Wheatstone SP-8, Техническое руководство

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Page 1 - 5 SP-8 / Dec 95
I
NSTALLATION
SYSTEM GROUND
Safety requirements dictate that a positive connection from the console
mainframe to electrical ground be made in the completed installation.
The system ground serves two important purposes:
(1) Provides a zero signal reference point for the entire audio system;
(2) Assure safety from electrical shock.
There exist two terms that one encounters in a discussion of ground:
(A) EARTH GROUND, which is usually a heavy copper rod driven into
the soil adjacent to the building (around 6 feet down) or a connection
to the copper water pipes leading into the building. Either is
acceptable, unless, of course, the water pipe is plastic.
(B) THE POWER COMPANY EARTH CONDUCTOR that enters the
building at the power line breaker box; this conductor should be
(and is often by code) tied to the above-mentioned earth ground at
one point. This point is the SYSTEM EARTH GROUND.
CONSOLE
2-TRACK
MULTI-TRACK
AC BREAKER
BOX
DEVICE 1
DEVICE 2
DEVICE N
CONSOLE POWER SUPPLY
CONTROL ROOM POWER AMP
STUDIO POWER AMP
OTHER
POWER COMPANY
EARTH GROUND
HEAVY
(#4 or #6)
COPPER
WIRE
HIGH POWER
EQUIPMENT RACK
COPPER ROD
SOIL
3-wire ground or separate wire run from chassis
EFFECTS RACK
MIC PANEL
GND
TYPICAL SYSTEM
GROUNDING SCHEME
etc.
3–5 ft.
The grounding point on SP-8 consoles is a terminal lug strip located on the
bottom of the mainframe, near the power connector. This is the central
grounding point for the console mainframe. TIE THE CONSOLE
MAINFRAME TO THE SYSTEM EARTH GROUND. TIE EVERY PIECE
OF EQUIPMENT IN THE ENTIRE AUDIO SYSTEM TO THE CONSOLE
MAINFRAME GROUND. If the system earth ground point is inaccessible, tie
the console ground mainframe ground to the power company earth conductor
at the main breaker box.
Tie the console mainframe
ground to the system earth
ground. Tie every piece of
equipment in the entire audio
system to the console
mainframe ground.
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