YOKOGAWA WT3000 User Manual page 61

6.2 ACQuisition Group
:ACQuisition:LENGth?
Function Queries the total number of points of the
waveform sampling specified by
":ACQuisition:TRACe."
Syntax :ACQuisition:LENGth?
Example :ACQUISITION:LENGTH? -> 100000
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:
(1) When ":ACQuisition:TRACe" is
FFT<x>
length = point/2+1 = 10001 or 100001
(2) When ":ACQuisition:TRACe" is not
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."
Syntax :ACQuisition:SEND?
Example • When ":ACQuisition:FORMat" is set to
{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:
(1) When "ASCii" is specified
The physical value is output in the <NR3>
format. The data of each point is delimited
by a comma.
(2) When "FLOat" is specified
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.
• The WT3000 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 the WT3000 (:ACQuisition:HOLD
ON). Otherwise, an error occurs, because
there is no waveform sampling data. The
output is as follows:
(1) When "ASCii" is specified
Outputs NAN.
(2) When "FLOat" is specified
Outputs #800000000.
:ACQuisition:SRATe?
Function Queries the sampling rate of the retrieved data
Syntax :ACQuisition:SRATe?
Example :ACQUISITION:SRATE? -> 195.312E+03
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.
Syntax :ACQuisition:STARt {<NRf>}
:ACQuisition:STARt?
<NRf> = 0 to 3999999
Example :ACQUISITION:START 0
: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
Function Sets the target trace of
":ACQuisition:SEND?" or queries the current
setting.
Syntax :ACQuisition:TRACe {U<x>|I<x>|
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)
Example :ACQUISITION:TRACE U1
:ACQUISITION:TRACE? ->
:ACQUISITION:TRACE U1
Description {SPEed|TORQue} are valid only on the motor
version (-MV).
IM 760301-17E