Marconi Instruments 2955 - Page 42

i
OPEHATION
(6)
Having
set
the step
size,
the frequency
may
be adjusted by repeatedly
pressing
one of the
A
INCREMENT
keys
FREQ
t
for
an
increment
or FREQ
|
for
a
decrement.
For fine
frequency
control,
use
the
VARIABLE! control
Level
To adjust
the signal
generator level,
proceed as
follows:-
(7)
Select
LET-EL
(T)-
to be
changed
is
displayed
in
reverse
field.
Enter
the
data
on the keypad
ending
with the level terminator
(i^,
e.g. for
-
34 dBm,
enter the following:'
LHVEL
aSm
(8)
If
required,
set the level
increment/'decrement
by
selecting A INCR (s) and
enter
the
data,
ending with the level terminator,
e.g.
for
0.5
dB steps,
enter
the
foiiowing;-
'
r
1
LEVEL
A
iNcn
•
5 c3
L
s 1 I
In the example,
LEVEL
may
be
omitted
since
it
has been
previously
entered in
(7).
(9)
Having
set the
step
size, the level
may be adjusted by
repeatedly
pressing one
of the A
INCREMENT
keys
@
,
FREQ
t
for an increment or FREQ
i
for a decre-
ment.
For
fine level
control,
use
the
VARIABLE control
(3),
To change
between
PD (loaded)
and
EMF
(unloaded), press
the HELP
key
@
and
then continue
by
following
’HELP Key Operation’.
Modulation
•
To set the
signal
generator
modulation, proceed
as
follows:™
Modulation
frequency
-
-
(10)
Select
SET MOD
0
.
(11)
Select
FREQ
0
and
then
enter the data, ending
with
the
frequency
terminator
0,
e.g. for
1.5
kHz AM.
FM or
OM, enter
the
following:-
.
^
-
Faso
I
1
1
5
1
rr\
V
1
(12)
If
required,
the modulation frequency
may be
adjusted as
for
(5)
and
(6).
3-18
46881-622N
Apr,
88