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186 PI-MAX
®
4 System Manual Issue 4
13.3.3 Gating Mode
LightField supports three Gating modes for RF experiments:
• Repetitive;
• Sequential;
• Custom.
The desired option is selected from the
Gating Mode drop down list on the
SuperSYNCHRO Timing panel. Each mode has its own set of configuration parameters
which are described in the following sections.
13.3.3.1 Repetitive
Perform the following procedure to configure Repetitive Gating Mode:
1. The first requirement is that the PI-MAX4: 1024i-RF camera be aligned and focused on
the area of interest in the experiment. This is best accomplished while the camera is
operating in Full Frame readout mode. Verify that the
Phosphor Decay Delay is
appropriate to the phosphor used by your camera: the phosphor decay delay time
entered in LightField can be viewed or changed after clicking on the
Advanced button
on the
Common Acquisition Settings expander. The procedure for initial focus is
described in Chapter 4, First Light.
NOTE:
The Phosphor Decay Delay setting tells LightField how long to
wait after the gate pulse to shift the image. If there is some
residual image from the first frame in the second frame, simply
increase the
Phosphor Decay Delay setting to allow more time
for the phosphor emission to decay before shifting the image.
2. After the alignment and focus, the PI-MAX: 1024i-RF system needs to be put into RF
modulation mode. On the
Common Acquisitions Settings expander, select Use RF
Modulation
.
3. On the Trigger expander, select Internal or External triggering.
• For External triggering, make sure the trigger characteristics on the Trigger
expander match the active trigger edge, etc. of the trigger pulse that will be used.
• For Internal triggering, set the Internal Trigger Frequency on the
SuperSYNCHRO Timing expander.
4. Open the SuperSYNCHRO Timing expander (at the bottom of the window.) See
Figure 13-2.