Advertisement
Example
of Instruction
2:
The
Displayed
Amplitude
(in
Figure
2-7)
is
-100 with a resolution of A.
a.
The
actual displayed
amplitude
is
-10.0
dBm.
b.
If
the stored resolution
is
0
through
9 (hexadecimal), the
amplitude
quantity
is
in
volts.
To
convert
the
number
to the actual
amplitude
in
nanovolts, multiply the
amplitude
number
by
the
power
of ten represented
by
the resolution.
Example:
An
amplitude
step of
12,
with
a resolution of 6
would
be an
actual
amplitude
step
of 1.2,000,000
nV
or 12
mV.)
3.
If
the Relative
Amplitude
mode
is
off,
the
data
stored
in
the reference
amplitude
location
is
not
used.
4.
If
the Relative
Frequency
mode
is
off,
the
data
stored
in
the reference
frequency
location
is
not
used.
5.
FM
and
FM
Step
quantities
have
a
number
and
a resolution associated
with them.
The
resolution nibble
is
comprised
of a
3-bit
resolution value
and
a
single
bit
units
value.
If
the units
value
is
0,
the
FM
quantity
is
in
Hertz.
If
the units
value
is
1,
it
is
a
(f)M
quantity
in
radians.
To
convert
the
num.ber
to the
FM
quantity
in
Hz,
multiply
the
number
by
the
power
of
ten
represented
by
the resolution.
Example:
The
FM
number
(in
this
figure)
is
500 with
a
resolution
of
10
Hz.
The
actual
FM
deviation
is
5000 Hz.
To
convert
the
number
to
the
(f)M
quantity
in
radians,
multiply the
number
by
the
power
of ten represented
by
the resolution,
then
divide the
result
by
1000.
Example:
A
deviation of
123
with
a resolution of
1
and
units
of
i
would
be
a
<^M
deviation of
1.23
radians.
If
the
Low-Rate
FM
option
is
installed,
the
FM
quantity adjusted
by
the resolution
has a resolution of
0.1
Hz.
The 4>M
quantity
is
derived exactly
as
it
is
without
the
option.
The
resolution
remains
the
same, however,
the
range
is
reduced by
a factor of
10
.
6.
The checksum
data
is
calculated
by
adding
the
data
in
the learn
string,
two
hexadecimal
digits at
a
time.
The
total,
including
the
checksum, should add up
to
a
number
whose
least significant
two hexadecimal
digits
are
01.
7.
Only
the current
state
of these
parameters
is
relevant,
so they are
only
valid
when
learning
memory
location
99.
Learn
strings
from
all
other
memory
locations
have
characters 65
and 66
set
to
"AM".
These parameters
are
provided
as status
information only and cannot be
set
using
the learn
interface
command.
NOTE
The
memory
location
code
must
be an unsigned
integer indicating the
memory
location
to
he
learned.
Memory
location
99
refers to
the current
instrument
settings.
Memory
location
98
refers to the
Instrument
Preset
State as
listed in
Table
2-3.
Advertisement
