AMETEK Lx Series II Programming Manual - Manual (Page 133)

Programming Manual Lx \ Ls Series II
129
where n1 ... n1024 are the data points that define the relative amplitudes of exactly one cycle of
the waveform. The first data point defines the amplitude that will be output at 0 degrees phase
reference.
Data points can be in any arbitrary units. The AC source scales the data to an internal format that
removes the dc component and ensures that the correct ac rms voltage is output when the
waveform is selected. When queried, trace data is returned as normalized values in the range of
±1. Waveform data is stored in nonvolatile memory and is retained when input power is removed.
Up to 50 user defined waveforms may be created and stored. See section 6.10 for programming
example.
Because waveform shape commands are coupled with the voltage commands, changing
waveforms without changing the programmed voltage may result in an error if the resulting peak
voltage amplitude exceeds the maximum voltage rating of the AC source. Refer to "Coupled
Commands" for more information.
6.2.2 Individual Phases
The following functions can be controlled separately in each phase:
VOLTage
CURRent
PHASe
MEASure
FETCh
CALibrate
Selecting a Phase
Two commands determine which output phase or phases receive commands in the three-phase
mode. These are:
INSTrument:COUPle ALL | NONE
INSTrument:NSELect
The *RST setting for INSTrument:COUPle is ALL. This setting causes programming commands
to be sent to all output phases simultaneously.
To send a programming command to only one of the output phases, set INSTrument:COUPle to
NONE, then select the desired output to receive the command with INSTrument:NSELect. For
example, when the commands
INSTrument:COUPle NONE
INSTrument:NSELect 2
are sent, all subsequent voltage commands will go to output phase 2, and all measurement
queries will return readings from output phase 2.
The INSTrument:COUPle command has no effect on queries. In the three-phase mode, queries
are always directed to the output selected by INSTrument:NSELect.
Programming the Output Phase
You can control the phase of the ac voltage waveform relative to an internal reference with:
PHASe
which sets the phase in degrees. If is positive, the voltage waveform leads the internal
reference.