Output Mask/Phase Lock
The output mask is used to mask “on” or mask “off” the output signal. If the “Mask” check box is ticked, you can specify the “on” duration and “off” duration in a mask cycle. You can use this feature to generate a burst-like signal. For signals with “Sine”, “Rectangle”, “Triangle”, “Saw Tooth”, “MultiTones”, “WFLibrary”, or “DTMF” waveform, you can also force each burst to start at the same phase by ticking the “Phase Lock” check box.
The following figure is a sine wave burst signal of 1000 Hz, with a mask-on duration of 0.01 s, a mask-off duration of 0.0055 s, and no phase lock. It can be seen that each burst is not started at the same phase angle.
The following figure illustrates the same signal as above except that the phase lock is enforced here. It can be seen that each burst is started at exactly the same phase angle.
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