Tektronix 2221 - Page 111

Options and
Accessories
-
2221 Operators
Table
7-28 (
cont
)
Commands
Description
2230
REFFrom
REF
< A -
Z >
Selects the
named
extended
memory
location (
REFA
-
REFZ
)
as the
source
of
waveform
data
for
the
next SAVeref
command .
The total
extra
memory is
26 Kbytes ,
and stored
waveform
records
of 1 K to 8
K (
averaged
4
K
acquisitions
) may be
stored .
The
nonvolatile
references of
the
2230
may not be
displayed ,
plotted , or
transmitted
directly
; they
must first be
moved
to
one of the
numbered
references
( REF1 - REF4 ) using the REFFrom and SAVeref commands .
2230
REFDisp REF < 1-3 > : ON , OFF
or
EMPTY >
П
Л
Л
П
7
П
П
Л
П
11
П
П
Turns the
named
2230
reference
display ON or
OFF .
EMPTY
erases the
named
2230
reference
display
and
turns
it off .
Reference
memory
locations 1 , 2 and
3
are 1024 - point memories .
ALL
REFDisp REF4 : < ON , OFF
or
EMPTY
>
REF4
is
the only
available
reference
memory
for the
2220 and
2221
instruments
.
Reference
memory
4
stores
a 4 K
( 4096 - point
)
reference
waveform and
occupies
the REF1 -
REF3
memory
locations
in
the 2230 .
2230
REFDisp REF < A - Z > : EMPTY
The
EMPTY
command
erases
the
named
reference if
it is
not
protected (
see
REFProt
command )
.
The
lettered
references
may
not
be
displayed
directly ;
they
must be
moved to a
numbered
save
reference
memory (
REF1
-
REF4
) .
2230
REFProt REF < A
- Z > : <
LOCked
,
PERM ,
or
UNLocked >
These
commands
control
the
write
protection of the 2230
nonvolatile
reference
memories (
REFA
-
REFZ
) .
LOCked and
PERM
disable
further
storage into the
named
reference or
erasure of the
waveform data .
PERM
protected
waveform
data
cannot
be
overwritten
using the
front -
panel
controls
.
See
REFStat
queries
to
obtain write
protection and
bytes free
status ,
2230
REFOrmat
CHAnnel :
< [
CH1 ]
or CH2
>
Selects
which
channel
of
the
saved
reference to
REFOrmat . If
there is no
SAVE
REF
waveform for
the
named
channel , a
service
request
status
byte is
generated
.
If an XY
waveform
is
selected for
reformatting , either
channel may be
selected
.
CH1 is
selected
without
the CH1
argument .
2230
REFOrmat
HMAG :
ON
Increases the
horizontal gain of the
REFORMAT
TARget
reference
waveform set
(
affects
vertical channels ) by a
factor
of
ten times .
2230
REFOrmat
HMAS :
OFF
Turns off the
horizontal
magnification of the
REFORMAT
TARget
reference
waveform
set
.
П
П
П
П
n
1 П
7-35