Page
5
of
10
INSTRUCTION
MANUAL
Preamplifier
Model
PAM
‐
840A
19121
El
Toro
Rd
●
Silverado,
CA
92676
●
(949)
459
‐
9600
●
fax
(949)
635
‐
0329
●
com
‐
power.com
REV21113
3.
0
Important
Precautions
Observe
the
following
safety
precautions
to
ensure
user
safety
and
maximizing
the
operating
life
of
the
preamplifier.
•
Remove
the
batteries
from
the
preamplifier
when
it
is
not
used
for
an
extended
period.
•
Use
only
the
battery
charger
adapter
supplied
with
preamplifier.
•
Replace
fuse
with
same
type
and
current
limit
•
Replace
only
with
batteries
supplied
by
Com
‐
Power.
•
Exercise
caution
when
handling
the
preamplifier
because
it
is
sensitive
electrostatic
discharge.
•
Avoid
using
the
preamplifier
in
environments
with
excessive
heat
or
moisture.
The
only
user
replaceable
part
in
the
preamplifier
is
the
battery
pack.
It
can
be
accessed
from
the
bottom
of
the
unit.
There
are
no
other
user
serviceable
parts
inside
the
unit.
Do
not
remove
the
main
instrument
cover.
If
the
preamplifier
needs
repair
please
contact
authorized
Com
‐
Power
service
center.
3.1
Excessive
RF
input
Do
not
exceed
RF
input
level
indicated
on
front
panel.
Excessive
RF
input
may
damage
the
preamplifier’s
sensitive
input
and
will
not
be
covered
under
warranty.
3.2
Saturation
In
addition
possible
damage
to
the
preamplifier
input,
excessive
RF
signals
may
cause
the
preamplifier
to
saturate.
When
a
preamplifier
reaches
saturation
point
the
gain
will
reduce
and
cause
a
nonlinear
increase
in
output
power
resulting
inaccurate
measurements.
PAM
‐
840A
can
handle
up
to
+10
dBm
(117
dBµV)
input
signal.
3.3
Calibration
The
factory
recommended
calibration
period
for
the
Preamplifier
is
12
months.
However,
its
performance
should
be
checked
periodically
to
ensure
the
preamplifier
is
operating
within
the
rated
specification
given
in
section
2.0
of
this
manual.
