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(b)
If
"*TRG"
(Ref.
A14)
is
used,
then send "DISP?"
(Ref.
B13)
to
place the
reading
in
the output queue.
(4)
To
return
to
continuous
measurement mode
send
"HOLD
OFF".
Manual
Mode
8
In
this
mode
the
measured
frequency,
or
a keyboard
entered frequency value,
is
entered
into
the
MANUAL
Store,
then
MANUAL
Mode
is
then
selected, (Ref.
B14).
(1)
To
store
a
center
frequency
(the
example shows
19 GHz), send the
command
string
"MAN
19E9".
(2)
To
store
the frequency
measurement,
send
the
command
string
"MAN
DISP".
(3)
If
Manual Mode
was
previously selected the
new
entered value
of
frequency
is
used
immediately,
otherwise,
to
enable
Manual Mode
send
"MAN
ON".
The
command
"MAN
OFF"
switches the
Manual
Mode
off,
setting
the
instrument
to
normal
automatic mode.
Further Functions
in
FREQ
C
(Automatic
Mode
Only)
9
In
FREQ
G,
normal
AUTOMATIC
Mode, two
more
functions are
available,
these are
LOW
FM
and
TRACK.
NOTE
1:
These
functions are
not
available in
MANUAL
Mode.
NOTE
2:
LOW
FM
and
TRACK
functions
are
mutually
exclusive;
only
one
of
the functions being
available at
a
time.
10
Selection of
one
function
(e.g.
TRACK),
whilst the other function
(LOW FM)
is
in use,
will
switch
off
the previously used function
(LOW
FM).
Switching
off
the
last
used
function
(TRACK)
will
then return
the
instrument
to
AUTOMATIC
Mode,
NOT
the previously used
function.
Set
LOW FM
(FREQ
C)
11
This
function
utilizes
longer gate times
to
accommodate
signals
with low
modulation
rates,
(Ref.Blb).
12
To
use
this
function proceed
as
follows:
(1)
Proceed
as described
in
'FREQUENCY
MEASUREMENT
-
INPUT
C\
(2)
Send
the
command
"LO
WFM
ON".
(3)
To
exit this
function
send
"LOWFM
OFF".
2151
OPS
4.5
A1571/DA
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