Programming Examples 5
Keysight Models 6811C, 6812C, and 6813C Programming Guide 233
Programming the output phase
You can control the phase of the AC voltage waveform relative to an internal
reference with:
PHASe <n>
which sets the phase in degrees. If <n> is positive, the voltage waveform leads the
internal reference.
In the single-phase models, the only discernible effect of using the PHASe
command is to cause an instantaneous shift in output waveform phase. This is
because the internal phase reference is not accessible externally.
Current limit
All ac source models have a programmable rms current limit function. The
command to set this limit is:
CURRent <n>
where <n> is the rms current limit in amperes.
If the load attempts to draw more current than the programmed limit, the output
voltage is reduced to keep the rms current within the limit. Since the rms
detection involves a filter time constant that is long compared to a single output
cycle, the response time of the rms current limit is not instantaneous. When the
output voltage is reduced, its waveform is preserved (the output waveform is
attenuated, not clipped).
The ac source can be programmed to turn off its output if the rms current limit is
reached. This protection feature is implemented with the
CURRent:PROTection:STATe command as explained in Chapter 3, "Language
Dictionary".
Peak current limit
The Keysight 6811C, 6812C, and 6813C have a programmable peak current limit
which limits the instantaneous current. The command to set this limit is:
CURRent:PEAK <n>
where <n> is the peak current in amperes.
Since instantaneous current tends to be highest when the output voltage is
highest, this current limit tends to clip the peaks of the output voltage waveform.
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