Fluke NORMA 4000 Operators, User Manual, Page: 63 / 184

Remote Control - Description of Commands
Commands and Queries
4
4-15
CALCulate:TRANsform:FREQuency:STOP <frequency>
Description
This command specifies the upper frequency of the harmonics calculation (frequency of
the rightmost FFT or DFT spectrum line).
Parameter(s)
<frequency>
Minimum: 10 Hz
Maximum: sample rate / 2
Sample rate can be queried by means of [:SENSe]:SWEep:FREQuency?.
The instrument coerces the specified value to the next higher exact frequency.
*RST state
Highest possible value (depending on the instrument)
Example(s)
CALC:TRAN:FREQ:STOP 625.0
CALC:TRAN:FREQ:STOP ?
Response: 625.0
Invalidates
-
Invalidated by
-
CALCulate:DATA? [<count>[,<offset>]]
Description
Returns spectrum data in the format defined by the FORMAT commands. When there are
no arguments to this command, all data according to the preamble information is output.
First returned spectrum line (either FFT or DFT) corresponds to the DC component of the
signal.
If a harmonic could not be calculated due to violation of sampling theoreme for some
frequency in DFT mode, NaN is returned for that harmonic.
If a harmonics measurement has not yet been performed or if this query is sent during a
harmonics measurement (STATus:OPERation bit 12 is set) an error "-230, Data corrupt
or stale" is generated and no data is returned.
Parameter(s)
Parameters are optional.
<count> Specifies the number of lines/harmonics to be returned for each function.
<offset> If not specified spectrum data starting at higher than 0th line/harmonic (DC component)
are returned. Otherwise first line returned has index given by <offset>.
If <offset> + <count> exceeds the number of lines available, an error "-222 Data out of
range" is generated. Use CALCulate:DATA:PREamble? To obtain the actual number of
harmonics/lines available.