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Operation
Model 867
2A
Table
34.
Local
Operating
Instructions
(2
of
4)
USING AN EXTERNAL
STANDARD
1.
On
the rear panel (see Figure
3-2),
remove Jumper
Q
(A3W3) from
the
FREQ
STANDARD EXT
connector
Q
(A3J10),
and
set
the
FREQ STANDARD
INT/EXT
switch
0
to
EXT.
2.
Connect
an
external frequency standard
of
5
or 10
MHz,
0
dBm (nominal) into 50
ohms impedance
to
the
FREQ
STANDARD EXT
connector
A
.
3.
Set the
LINE
Q
switch to
ON
and the
RF
switch
Q
to ON.
4.
The front
panel display should indicate
as
follows:
STATUS
annunciator.
........
INTERNAL
REF OFF
The
NOT PHASE LOCKED
annunciator may
light
if
the
external reference
is
not
of
sufficient accuracy
in frequency
or
has
an insufficient power
level.
The external reference must be
within ±200 Hz of
10
MHz
or
±100 Hz of
5
MHz
for reliable locking to occur.
5.
The Synthesizer may now
be used
for
any
of
its
normal operations.
SETTING AMPLITUDE MODULATION
1.
Set front panel
(see
Figure 3-1) controls and
switches
as
follows:
@
METER MODE
selector
........
AM
2.
Connect
an
oscillator with
a
600
ohm output
impedance to the
AM INPUT
connector
Bt-'l
.
Set the
oscillator's
output to
0
Vrms
and to
the modulation frequency
desired.
3.
Set the
AM
Function
switch
(^
to 30% or 100%. The Meter
0
should indicate 0% on the
0
to
3
scale, or 0% on the
0
to 10
scale.
4.
Set the
OUTPUT LEVEL VERNIER
control
©
and the
OUTPUT
LEVEL RANGE
control
©
to
the
level
desired
from the
RF OUTPUT
connector
@
.
The
OUTPUT LEVEL VERNER
@
control
should be
set
to
0
dB or
below for
least
distortion.
5.
Increase the oscillator's
output until
the
desired
percent
modulation between
0
to 30%
(full
scale)
is
reached. Full
scale
is
1
Vpk.
3-10
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