
2
See
\Changing
the
V
alue
of
a
P
arameter"
in
Chapter
1
if
you
need
details
on
how
to
edit
parameters
.
Y
ou
can
change
the
units
by
pressing
NNNNNNNNNNNNNNNNN
W/dBm
.
Attenuator
If
you
have
the
optional
attenuator
installed,
you
may
need
to
press
NNNNNNNNNNNNNNNNNNNNNNN
PowMode
to
get
the
display
shown
above
.
Setting
P
ower
and
Attenuation
Attenuator
If
you
have
the
optional
attenuator
installed,
you
can
also
set
the
output
power
by
setting
rst
the
laser
output
power
,
and
then
setting
the
amount
of
attenuation.
Press
NNNNNNNNNNNNNNNNNNNNNNN
PowMode
from
the
screen
shown
in
Figure
2-7
to
change
to
the
Attenuation
Mode
.
Press
NNNNNNNNNNN
Att
to
select
the
attenuation
parameter
.
Press
NNNNNNNNNNNNNN
Pref
to
select
the
laser
output
power
.
What
is
Excessive
P
ower?
An
EXCESSIVE
message
indicates
that
the
value
you
have
set
for
the
output
power
is
larger
than
the
laser
diode
is
capable
of
producing
at
this
wavelength.
The
instrument
sets
the
output
power
as
high
as
possible;
it
is
this
actual
output
power
that
is
shown
as
part
of
the
EXCESSIVE
message
.
Note
If
the
chosen
value
is
simultaneously
too
low
for
the
coherence
control,
if
you
are
also
using
this
,
the
EXCESSIVE
is
shortened
to
EXC.
The
Analog
Output
The
Analog
Output,
on
the
front
panel
of
the
instrument,
outputs
a
dc
level
that
is
proportional
to
the
laser
output
power
.
The
relationship
between
this
voltage
level
and
the
output
power
is
not
calibrated,
but
is
approximately
1mV
for
each
1W
.
Setting
Wavelength
and
P
ower
2-9
Summary of Contents for 8167A
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Page 164: ...D Figure D 1 Test Setup for the Wavelength Tests D 4 Performance Tests ...
Page 177: ...D Figure D 5 Test Setup for the Source Spontaneous Emission Test Performance Tests D 17 ...
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