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IEC Mode Command Summary - E
177
MEASure:ARRay:VOLTage:FLUCtuations:PST?
This query measures voltage fluctuations in accordance with the IEC 868 standard. It is only available
when IEC mode is selected with SYSTem:CONFigure. The parameter specifies the number of Pst
integration periods for which data will be returned in response to the query. This query returns 1 data
structure per specified integration period for a total of <n> structures.
For example: If CALCulate:INTegral:TIME specifies 10 minutes and <n> is set to 12, a 2 hour
measurement is initiated (10 minutes times 12) and 12 structures are returned. Since there are 14 data
points per structure, a total of 168 points are returned. The structure includes flicker perceptibility values
for the component percentiles making up Pst, the Pst value itself, various RMS voltage values (Dmax, Dc,
and Dt), together with indices for these RMS values that give their approximate location in the RMS time
series for the corresponding integration period.
This command is closely related to two similar commands that return different types of data (see
MEAS:ARR:VOLT:FLUC:FLIC and MEAS:ARR:VOLT:FLUC:ALL). Record numbering begins with one.
The figure below defines the structure of the data returned by this query:
P_0.1
P_1s
P_3s
P_10s
P_50s
Pst 12 point Pst array
Dmax
Dmax index
Dc
Dc index
Dt
repeat <n> times
Dt index
Record Number
Error Code
Command Syntax
MEASure:ARRay:VOLTage:FLUCtuations:PST? <NRf+>
Parameters
1 to 1008
Examples
MEAS:ARR:VOLT:FLUC:PST? 12
Returned Parameters
14 to 14,112 values
Related Commands
ABORt SYSTEM:CONF INST:NSEL
MEAS:ARR:VOLT:FLUC:FLIC?
MEAS:ARR:VOLT:FLUC:ALL?