User Manual

41
Figure 39 - Calculating phase difference with Lissajous figure
The phase difference between the two sinusoids is:
 = 
−1
(


� )
If the principal axis of the ellipse is within quadrant I and III, the phase difference should be in
quadrant I and IV (between 0 to π/2 or 3π/2 to 2π). If the principal axis of the ellipse is within
quadrant II and IV, the phase difference will be within quadrant II and III (between π/2 to π or π
to 3π/2).
4.8 Sequence Mode
Sequence mode is used to capture a series of frames. The waveforms are not displayed during
capture, letting the oscilloscope focus its resources on collecting the sample data. This improves
the waveform capture rate. The maximum capture rate is more than 300,000 waveforms/s. An
infrequent event is more likely to be captured using sequence mode.
You set the number of frames to capture (called segments) and the oscilloscope will run until the
specified number of frames has been acquired. The oscilloscope keeps running and filling data
memory in segments for each trigger event until the memory is full. Then you can use the History
button to view the captured data.
Using the Sequence Mode:
1. The HORIZONTAL Format must be set to YT
2. Press the Acquire button on the front panel to enter the ACQUIRE menu.
3. Set the horizontal format to YT by pressing the XY button until it displays Off.
4. Press the Sequence softkey to enter the SEQUENCE menu.
Figure 40: SEQUENCE menu
5. Press the Segments Set softkey and turn the Universal Knob to select the desired value.