YOKOGAWA WT3001E User Manual page 62

6.2 ACQuisition Group
:ACQuisition:LENGth?
Function Queries the total number of points of
the waveform sampling specified by
" :ACQuisition:TRACe ."
:ACQuisition:LENGth?
Syntax
:ACQUISITION:LENGTH? -> 100000
Example
Description • When the measurement mode is MATH, the
number of data is determined by the data
update interval ( :RATE ) setting.
length = rate(sec) × 200000
• When the measurement mode is FFT, the
number of data is determined by the setting
for the number of FFT computation points
( :DISPlay:FFT:POINt ) as follows:
When " :ACQuisition:TRACe " is
(1)
FFT<x>
length = point/2+1 = 10001 or 100001
When " :ACQuisition:TRACe " is not
(2)
FFT<x>
length = point = 20000 or 200000
• In a mode other than MATH or FFT, an error
occurs since there is no acquisition data, and 0
is returned.
:ACQuisition:SEND?
Function Queries the waveform sampling data specified by
" :ACQuisition:TRACe ."
:ACQuisition:SEND?
Syntax
• When " :ACQuisition:FORMat " is set to
Example
{ASCii}
:ACQUISITION:SEND? ->
<NR3>,<NR3>,...
• When " :ACQuisition:FORMat " is set to
{FLOat}
:ACQUISITION:SEND? -> #8 (number of
bytes, 8 digits)(data byte sequence)
Description • The format of the waveform sampling data
that is output varies depending on the
" :ACQuisition:FORMat " setting as follows:
When " ASCii " is specified
(1)
The physical value is output in the <NR3>
format. The data of each point is delimited by a
comma.
When " FLOat " is specified
(2)
The physical value is output in IEEE
single-precision floating point (4-byte) format.
The output byte order of the data of
each point follows the order that is set
using the " :ACQuisition:BYTeorder "
command.
• This instrument outputs the waveform
sampling data in the range specified by
" :ACQuisition:{STARt|END} ." However,
data exceeding the waveform sampling data
range, 0 to (the total number of data points – 1),
is not output.
6-18
• This command is valid when the measurement
mode is set to MATH or FFT and the waveform
sampling data is held inside this instrument
( :ACQuisition:HOLD ON ). Otherwise, an
error occurs, because there is no waveform
sampling data. The output is as follows:
When " ASCii " is specified
(1)
Outputs NAN.
When " FLOat " is specified
(2)
Outputs #800000000.
:ACQuisition:SRATe?
Function Queries the sampling rate of the retrieved data
:ACQuisition:SRATe?
Syntax
:ACQUISITION:SRATE? -> 195.312E+03
Example
Description This command is valid when the measurement
mode is set to MATH or FFT. Otherwise, an
error occurs (returns NAN), because there is no
waveform sampling data.
:ACQuisition:STARt
Function Sets the output start point of the waveform
display data that is transmitted by
" :ACQuisition:SEND? " or queries the current
setting.
:ACQuisition:STARt {<NRf>}
Syntax
:ACQuisition:STARt?
<NRf> = 0 to 3999999
:ACQUISITION:START 0
Example
:ACQUISITION:START? ->
:ACQUISITION:START 0
Description Set the point in the range up to (the total
number of data points – 1). The total
number of data points can be queried using
" :ACQuisition:LENGth?. "
:ACQuisition:TRACe
Sets the target trace of " :ACQuisition:SEND? "
Function
or queries the current setting.
:ACQuisition:TRACe {U<x>|I<x>|
Syntax
SPEed|TORQue|MATH<x>|FFT<x>}
:ACQuisition:TRACe?
<x> of U<x>, I<x> = 1 to 4 (element)
<x> of MATH<x> = 1 to 2 (MATH)
<x> of FFT<x> = 1 or 2 (FFT)
:ACQUISITION:TRACE U1
Example
:ACQUISITION:TRACE? ->
:ACQUISITION:TRACE U1
Description {SPEed|TORQue} are valid only on models with
the motor evaluation function (/MTR option).
IM WT3001E-17EN