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Tektronix 2221 - Page 116

Tektronix 2221
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U
Options
and
Accessories
-
2221
Operators
NOTE
The
information
given
in
the
Waveform
Preamble
Fields
table
is
primarily
to
help
identify
the
result
of
a
WFMpre
?
query
.
As
such
,
the
arguments
are
not
usually
sent
as
individual
commands
,
but
are
grouped
together
as
a
complete
waveform
preamble
.
If
sent
as
a
single
command
,
an
argument
value
is
not
accepted
(
except
as
noted
for
ENCdg
)
until
the
curve
it
is
supposed
to
go
with
is
transferred
to
the
selected
DATA
TARget
reference
memory
.
If
any
size
error
in
any
of
the
waveform
preamble
numeric
arguments
is
sent
to
the
oscilloscope
,
it
will
be
accepted
.
Then
,
when
the
curve
data
is
sent
the
error
will
be
rejected
,
and
a
waveform
preamble
error
service
request
will
be
sent
.
C
|
Table
7-30
Waveform
Preamble
Fields
U
Commands
Description
ALL
WFMpre
ENCdg
:
<
ASCII
,
(
BINaryl
,
or
HEX
>
Selects
the
waveform
curve
data
encoding
format
for
transferring
data
.
WFEpre
ENCdg
and
DATA
ENCdg
operate
identically
.
Data
points
are
represented
as
unsigned
integers
in
any
of
the
encoding
formats
.
|
ALL
WFMpre
?
Returns
the
waveform
identification
string
as
with
the
WFMpre
?
Wild
query
plus
the
value
for
all
the
waveform
preamble
arguments
.
The
short
form
of
the
return
is
:
U
WFM
WF
;
*
<
identification
string
>
"
,
NR.P
:
2048
,
PT.O
:
256
,
PT.F
:
ENV
,
XMU
:
1.0E
+
3
,
XOF
:
,
XUN
:
S
,
XIN
:
10.0E
-
6
,
YMU
:
8.0E
-
3
,
YOF
:
,
YUN
:
V
,
ENC
:
ASC
,
BN.F
:
RP
,
BYT
:
1
,
BIT
:
8
,
CRV
:
CHK
;
Each
of
the
arguments
may
be
queried
separately
to
find
out
its
value
.
کال
ALL
WFMpre
?
Wild
Returns
an
ASCII
waveform
identification
string
giving
the
key
features
of
the
waveform
.
The
information
returned
is
:
acquisition
source
,
channel
,
Volts
/
Div
,
input
coupling
,
Sec
/
Div
,
acquisition
mode
,
and
the
number
of
the
curve
being
sent
,
In
XY
mode
,
the
CH2
Volts
/
Div
and
input
coupling
are
added
.
The
waveform
ID
is
ignored
if
received
as
a
command
.
The
form
of
the
return
is
:
U
WFM
WFI
:
*
ACQ
,
CH1
,
0.2mV
,
DC
,
0.5mS
,
AVERAGE
,
CRV
#
3
"
;
or
for
XY
:
UU
U
WEM
WFI
:
*
REF4
,
XY
,
20mV
,
DC
,
50mV
,
DC
,
0.5mS
,
SAMPLE
,
CRV
#
1
"
;
NOTE
The
DATA
CHAnnel
must
be
CH1
to
get
the
XY
information
.
All
vertical
information
is
omitted
for
a
2220
.
U
7-40
y

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