AMETEK BPS Series Programming Manual - Manual (Page 56)

AMETEK Programmable Power BPS / MX / RS Series SCPI Programming Manual
56 Manual P/N 7003-961 Rev AA
4.5.1 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.....
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:
MX Series I: 25.6 microseconds for single-phase mode and 76.8 microseconds for three-
phase mode.
MX/RS Series II: 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]? [,]
FETCh:ARRay:CURRent[:DC]? [,]
Parameters Optional block and offset parameters ,. Where the first value
is the number of 256 sample blocks to transfer and the second
value 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? []
FETCh:ARRay:CURRent:HARMonic? []
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:
MX Series I: 16 kHz in single-phase mode and 6.510 kHz in three-phase mode.
MX/RS Series II: 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