Commands
ALL
WFMpre NR.Pts:<NR1 >
--
ALL
WFMpre PT.Off:<NR1 >
Options and
Accessories-2230
Operators
Table 7-30 (cont)
Description
<NR1 > is the number of points
in
the waveform.
Each
point can
be
a single Y
value (with time implied),
an
X-Y
pair, or a Max-Min pair. Although the record length
is either 1024 data point or 4096 data points, the NR.Pts <NR1 > value may
be
256, 512, 1024, 2048, or 4096 points. The value depends
on
the number of
channels, the acquisition mode,
and
whether smoothing is
on
or off. A table
expressing the conditions
and
the record length to NR.Pts ratio value follows:
NR.Pts
to
Record
Length Number of Acquire
Ratio Channels Mode
SMOOTH
Rec/1
1 SAMple NA
Rec/1
AVErage
NA
Rec/1
1 PEAkdet
ON
Rec/1
1 ACCpeak
ON
Rec/2
2
SAMple
NA
Rec/2 2 AVErage NA
Rec/2 2 PEAkdet
ON
Rec/2 2 ACCpeak
ON
Rec/2 1 PEAkdet OFF
Rec/2 1 ACCpeak
OFF
Rec/4
2 PEAkdet
OFF
Rec/4 2 ACCpeak OFF
For example, if the number of channels is two
and
the acquisition
is
peak detect
with smoothing off, the number of points for a waveform
in
a 4 Kbyte record is
4096 divided by 4 (1024 points).
<NR1 >
is
the trigger position relative to the first data point
in
the record. For a
1024 point record,
<NR1
> for PT.Off ranges from 4 to 1024
in
increments
of
4.
The normal values for a 4096 point record range from 4 to4096.
NOTE
<NR1
> will be a negative
value
if
the
trigger occurred before
the
first data point
in
the
record window. Since any 1024 point window
of
a 4096 point record may be
transferred,
the
legal values
of
<NR1
> for PT.Off are
-3096
to +4096.
If
the
PT.Off
value
is unknown,
-10000
is
the
<NR1
>
value
returned.
7-41
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