Tektronix 2221 - Page 118

Options and
Accessories -
2221
Operators
u
Table
7-30 (
cont
)
Commands
Description
บ
ALL
WFMpre PT.Fmt : < Y , XY ,
r ENV >
Point
format defines how
to
interpret the
curve
data
points
.
u
Y
format
means
that X
- axis
information is
derived
from
the
waveform
preamble
and not sent explicitly . The data values represent the vertical amplitude of the
waveform at
that
data
point
position
.
XY format
means that the
data points
are in X - Y
pairs , with X
first .
ENV format
means that the
vertical data
is sent in max
- min pairs .
The data is
sent in the form :
C
.... , y1max , y1min , y2max.y2min ...
ENV is valid
for
PEAkdet
and
ACCpeak
acquisition
modes
with
SMOoth OFF .
ALL
WFMpre XUNits : < S or CLKs >
Gives the units value for the XING
If XUN is S
the X -
increment is in
seconds
; if
in CLK , the
X -
increment is
unknown . ( CLK
is
returned when the
SEC / DIV
setting
is
EXT
CLK . )
U
ALL
WFMpre XINcr : < NR3 >
U
The XINcr <
NR3 > value
is the time
between
data
points . If XINcr
for a
waveform being sent to
the
oscilloscope does
not
correspond to a
legitimate
SEC / DIV
setting , the new
curve data is
not
accepted
,
and a
command
argument
error service request is sent ( if RQS is ON ) . The queried XINcr value of < NR3 >
is set equal to 1 ( 0.1E + ) if it is unknown , as is the case for EXT CLK .
UU
ALL
WEMpre YUNits : < V or DIVS > Indicates
the
units of YMUIt .
When the CAL
knob of the
DATA
CHAnnel
is
not in
the detent
position
, the
DIVs
argument is
returned
.
DIVs is
always returned for
the
2220
since
the
vertical
scaling
is
unknown .
ALL
WEMpre YMUIt
: < NR3 >
11
The
YMUIt < NR3 >
value
is
the step
size of the
digitizer ( volts
between
digitizer
levels ) . I the
YMUit
for
a
waveform being sent
to the
oscilloscope does not
correspond to a legitimate VOLTS / DIV setting , the new curve data is not
accepted
, and
waveform
preamble
error service
request is sent (
if RQS is ON ) .
The
queried YMUlt value
of < NR3 > is
40.0E - 3
when the
VOLTS / DIV CAL
knob
for
the DATA
SOUrce
is
not
in
the
detent
position .
ALL
WFMpre
YOFf : < NR1
>
The
YOFf < NR1
>
value is the Y
coordinate of
ground
. If
ground level is not
known , the value of - 10000 is returned .
น
ALL
WFMpre
XMUIT
u
XMUIt
and
XOFf are
similar
to
YMUIt and
WFMpre XOFF
YOFf
. They
are
added
to the
waveform preamble for XY
waveforms
. For
all XY
waveforms , the
YUNits
value
is
valid for
both the X
and the Y
data
points
. The
value
of
XUNits
is
referenced to
the
sampling
rate
.
C
C
C
C
7-42