Sequoia Series 51
4.4.1 Current Array Data
MEASure:ARRay:CURRent[:DC]?
FETCh:ARRay:CURRent[:DC]?
Phase Selectable
These queries return an array containing the instantaneous output current in amperes. The data
returned in arbitrary block data format as follows:
#5<block length n><b0><b1><b2><b3>.....<bn-3><bn -2><bn-1><bn>
where b0,b1,b2,b3 are four hex bytes represent IEEE single precision floating number, where b0 is
the most significant byte and b3 is the least significant byte.
The output voltage and current are digitized whenever a measure command is given or whenever an
acquire trigger occurs. The time interval between samples is:
10.4 microseconds for single-phase mode and 31.2 microseconds for three-phase mode.
The query SENSe:SWEep:TINTerval? will return the time interval, the position of the trigger relative to
the beginning of the data buffer is determined by SENSe:SWEep:OFFSet.
Query Syntax MEASure:ARRay:CURRent[:DC]? [<n>,<n>]
FETCh:ARRay:CURRent[:DC]? [<n>,<n>]
Parameters Optional block and offset parameters <n>,<n>. Where the first value
<n> is the number of 256 sample blocks to transfer and the second
value <n> is the first block (offset) to start with. Number of blocks is
from 1 to 16, offset is from 0 to 15.
Examples MEAS:ARR:CURR? FETC:ARR:CURR? 4,0
Returned Parameters 4096 data points in arbitrary block data format
Related Commands INST:NSEL SENS:SWE
MEASure:ARRay:CURRent:HARMonic?[<nrf>]
FETCh:ARRay:CURRent:HARMonic? [<nrf>]
Phase Selectable
These queries return an array of harmonic amplitudes of output current in rms amperes. The first value
returned is the dc component, the second value is the fundamental frequency, and so on up to the
50th harmonic. Harmonic orders can be measured up to the fundamental measurement bandwidth of
the measurement system:
16 kHz in either phase mode.
Thus, the maximum harmonic that can be measured is dependent on the output frequency. Any
harmonics that represent frequencies greater than the above frequencies are returned as 0.
The total number of harmonic values returned may be specified as a parameter to the query command.
Only harmonic data values from 0 (dc) to the number specified will be returned. This capability may
be used to reduce the transfer time by avoiding the transfer of unwanted data. If the fundamental
frequency is programmed to 400 Hz for example, there is no need to query harmonics above number
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