3. OPERATION
Before the instrument
is
switched on, ensure the voltage selector
is
set
to
the correct line voltage.
If
not, unscrew the central fuse, remove the black
selector
bush, insert the pin in the socket corresponding
to
the desired
mains
voltage
and
push
it
fully
in. The correct mains voltage should now
appear in the
window.
Ensure
that
air can circulate
normally
around the heat sink. The Power
Amplifier
should
not
be
placed in a closed volume such
as
a box, etc. The
heat sink can
be
warm
(typically
80°C).
Care should
be
taken
not
to
leave
temperature sensitive objects (e.g. cables) in contact
with
it.
Connect the
signal source
to
the
INPUT
of
the Power
Amplifier,
and
connect the
load
to
the OUTPUT terminals.
Feed
the signal
to
be
amp I ified
to
the 2706,
and
adjust the
ATTENUATOR
and the
GAIN
CONTROL,
and/or
the
controls on the generator
so
that
the desired
output
level
is
obtained.
If
the CLIPPING lamp
is
lit,
reduce the
input
level or attenuate
further.
If
a frequency sweep
is
to
be
made, ensure
that
no clipping occurs
throughout
the frequency range, especially when the Power
Amplifier
is
to
be
used in a regulated system.
Care
should
be
taken
to
avoid ground loops.
It
is
recommended
to
isolate
accelerometers
from
ground, using
an
isolated stud and a mica washer, when
ground
loops
are
likely
to
occur.
7
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