9.
Set
the
attenuation
to
1.0dB
.
III.
Modulation
Function
T
est
10.
Using
a
BNC
cable
,
connect
the
power
meter
transducer
output
to
the
oscilloscope
input
and
set
the
oscilloscope
as
follows:
0.5V/DIV
DC
coupled,
1ms/DIV
.
11.
On
the
power
meter
,
switch
the
autoranging
o
and
select
the
0dBm
range
.
12.
On
the
HP
8153A
with
the
module
under
test,
press
4
Pa
ram
5
to
select
the
AUX
parameter
.
Monitor
the
frequency
change
on
the
oscilloscope
as
you
set
the
modulation
to
270Hz,
1kHz,
and
then
to
2kHz.
Use
4
*
5
and
4
+
5
to
modify
the
modulation.
Note
the
reaction
on
the
T
est
Record.
IV
.
Stability
T
est
1.
Enable
the
HP
81554SM
laser
output
and
allow
the
instruments
to
warm
up
for
20
minutes
.
2.
Select
the
channel
with
the
source
.
a.
Press
4
Pa
ram
5
to
select
the
AUX
parameter
.
Set
this
parameter
to
CW .
b.
Press
4
Pa
ram
5
to
select
the
ATT
parameter
.
Set
this
parameter
to
zero
.
3.
On
the
power
meter:
a.
Cover
the
input
to
the
sensor
with
a
plastic
cap
and
press
4
Zero
5
to
zero
the
meter
.
b.
Press
4
Pa
ram
5
to
select
the
parameter
.
Set
this
parameter
to
the
value
displayed
for
the
source
.
c.
Press
4
Pa
ram
5
to
select
the
T
parameter
.
Set
this
parameter
to
1s .
4.
Using
the
HP
81101A
C
cable
,
connect
the
output
of
the
source
to
the
input
of
the
sensor
.
Make
sure
that
the
cable
is
xed
and
that
it
cannot
be
moved
during
the
measurement.
HP
81554SM
P
erformance
T
ests
D-5
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