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HP 5335A - Page 57

HP 5335A
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Operation
and
Programming
3-193.
ALPHA
CHARACTER.
One
of
eight
single
characters
which
specify
the
type
of
measure¬
ment.
It
is
generally
used
to
indicate
the
type
of
units.
The
alpha
characters
are:
F
-
precedes
Frequency
measurements;
units
of
Hz
(Hertz)
S
-
precedes
Time
measurement;
units
of
s
(seconds)
V
-
precedes
Voltage
measurements;
units
of
V
(Volts)
R
-
precedes
Ratio
measurement;
no
units
T
-
precedes
Totalize
measurements;
no
units
sp
-
precedes
1/TIME,
DUTY
CYCLE,
PHASE;
units
as
specified
A
-
precedes
A
Channel
TRIG
LVL;
units
of
V
(Volts)
B
-
precedes
B
Channel
TRIG
LVL;
units
of
V
(Volts)
M
-
precedes
MEAN
output
with
SOI
N
-
precedes
MIN
output
with
SOI
X
-
precedes
MAX
output
with
SOI
NOTE
For
TRIG
LVL,
two
complete
19
character
output
bytes
are
sent
in
succession.
Each
Channel
requires
a
complete
output
sequence.
3-194.
MEASUREMENT
DATA
FIELD.
The
data
field
consists
of
a
14-character
string.
The
number
begins
with
the
sign
(+
or
-),
followed
by
the
digits
in
descending
order
or
significance.
The
number,
however,
is
right-justified
within
the
data
field.
To
keep
the
number
of
characters
constant
within
the
total
string,
spaces
(up
to
10)
will
be
inserted
preceding
the
sign.
3-195.
EXPONENT.
Preceded
by
an
“E”
and
the
sign
(+
or
-),
the
exponent
will
be
a
multiple
of
3,
similar
to
the
display
which
is
in
engineering
format.
On
some
occasions,
it
is
possible
that
the
format
of
the
HP-IB
output
and
the
display
will
differ.
Nonsignificant
zeros
in
the
display
are
converted
to
real
zeros,
and
the
output
is
such
that
there
is
always
a
significant
digit
left
of
the
decimal
point.
3-196.
The
following
string
illustrates
a
typical
output
byte
for
a
FREQ
A
measurement
of
12.3456789
MHz.
The
output
byte
is
followed
by
a
(CR)
carriage
return
and
a
(LF)
line
feed.
F
(sp)
(sp)
+1
2.34567890E
+
06
(CR)
(LF)
NOTE
The
Data
Output
Rate
for
a
complete
output
string
consisting
of
19
characters
plus
a
CR
and
LF
is
typically
8
ms.
3-197.
Output
Modes
3-198.
The
5335A
powers
up
with
the
following
output
modes:
WA0,
SR0,
SO0.
3-199.
When
the
Wait
to
be
Addressed
mode
is
OFF
(WA0)
the
5335A
will
output
only
if
it
is
addressed
to
talk
and
RFD
is
true
and
measurement
data
is
ready.
If
at
the
end
of
a
measurement
the
5335A
finds
that
it
is
NOT
addressed
to
talk
or
that
RFD
is
false
the
measurement
data
is
not
sent
and
a
new
measurement
is
started.
3-200.
When
the
Wait
to
be
Addressed
mode
is
ON
(WA1)
the
5335A
will
wait
to
be
addressed
and
for
RFD
to
be
true,
in
this
mode,
new
measurements
are
not
started
until
the
data
from
the
previous
measurement
is
sent,
or
if
a
command
is
sent.
3-41
Model
5335A

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