Model 6220/6221 Reference Manual Wave Functions (6221 Only) 7-7
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Figure 7-1
Offset example
Duty cycle
For a square wave (Figure 7-2A), the duty cycle setting is the portion of the total
cycle that the wave is high relative to the period of the waveform. For a ramp
waveform (Figure 7-2B), the duty cycle corresponds to the fraction of the total
wave cycle that is rising. A 50% duty cycle corresponds to a symmetric triangle
wave. The left waveform in Figure 7-2B has a 100% duty cycle, the center wave-
form has 0% duty cycle, and the right waveform has a 50% duty cycle.
Amplitude units
The front panel allows setting wave amplitude in either RMS or peak units. The
default is peak. The RMS selection will only apply for sine wave (RMS =
0.70710678 x peak) or triangle wave (RMS = 0.57735027 x peak) and be ignored
for other waveform types. The wave amplitude units are available for front panel
only; remote operations always receive and return the units in peak. The choice
between RMS and peak from the front panel is not saved as part of a stored
setup. Power cycling the instrument always resets the front panel menu to the
default of peak. When editing the wave amplitude, the label “Peak” or “RMS” will
be displayed if the waveform type is affected by the RMS vs. peak selection (ramp
or sine waves only).
1mA
0mA
10mA Peak
20mA p-p
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