User Manual – Rev B
FCS Series II
three-phase configuration, press the
Phase
key until all phase enunciators (øA, øB and øC) are
lit. Waveform selections made in this mode will apply to all three phases.
4.4.3 Creating Custom Waveforms
The FCS controller supports up to 50 user defined waveforms in addition to the 3 standard
waveforms. Custom waveforms cannot be created from the front panel of the FCS Series.
Rather, they have to be downloaded through the IEEE-488, RS232C, LAN or USB interface.
Each waveform is defined by 1024 data points. Each data point can range between –1 and +1
(floating point number). See Lx Series II programming Manual (P/N 7004-981) for details on
downloading waveforms.
Once downloaded, waveforms remain in non-volatile memory and will be visible in the
to each custom
ted.
Waveforms may be deleted using the IEEE-488, RS232C, LAN or USB interface as well.
Custom waveforms cannot be deleted from the front panel however to avoid accidental erasure.
4.4.4 RMS Amplitude Restrictions
WAVEFORMS menu for selection. The user can assign a 12-character name
waveform. Avoid using any of the standard waveform names (SINE, SQUARE or CLIPPED) as
these names will not be accep
The output of a sine wave may be programmed to the full rms value of the voltage range
selected. If the AC source is in the 300 V range, the maximum programmable rms vo
Volt. If a custom waveform is used however, the maximum programmable rms voltage may be
less than the maxim
ltage is 300
um range value. The voltage range limit is based on the use of a sine wave
ected waveform and
controlling the rms limit accordingly. Thus, each custom waveform may have a different
controller will prevent the user from programming the rms voltage
above this limit. If a value is entered in the PROGRAM menu above this value, a “Voltage peak
with a 1.414 crest factor. A 300 V rms sine wave has a 424 Volt peak voltage. The AC source
has a maximum peak voltage capability that is determined by the selected voltage range. If the
user selects a custom waveform with a crest factor that is higher than 1.414, the peak voltage
would exceed this maximum if the rms voltage were to be programmed at 300 V rms.
The FCS Series II power source automatically limits the maximum allowable programmed rms
voltage of a any custom waveform by calculating the crest factor of the sel
maximum rms value. The
error” message is generated.
Figure 4-9: Waveform Crest Factor Affects Max. rms Voltage
The figure shown here illustrates the relationship between the crest factor of the wave s
its “peakiness”) and the
hape (or
maximum peak voltage allowed for a given voltage range. Since the
peak voltage cannot exceed the AC source’s capabilities, the programmable rms voltage has to
be restricted, in this case to only 167.8785 volt for the waveform on the left. The sine wave on
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Summary of Contents for FCS Series II
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