Chapter 6
Timing Modes
47
Example 4
Laser (or other experimental equipment)
HV Gate Pulser
Controller
Trigger in
Trigger out
Trigger out
Trigger in
Inhibit
SHUTTER MONITOR (ST-130,
ST-133, ST-138, PentaMAX)
This example is used when the experiment has a long or unpredictable delay between the
time it is gated and when it fires. Here, again, the controller is the master, but the CCD
readout is controlled by the pulser, as in Example 1.
First, the controller triggers the laser. When the laser fires it triggers the detector.
Immediately following gating the controller is triggered. Following the completion of the
exposure, CCD readout begins.
The controller is operated in the Store Enable mode. SHUTTER MONITOR may be
connected to the pulser to prevent gating during readout, but laser pulses that coincide
with readout will be missed. One way to minimize those occurrences is to set the
exposure to the longest feasible value (i.e., keeping background level low enough so that
it does not affect the dynamic range of the measurement).
Figure 13.
System
configured for
experiment with
long or
unpredictable
delay.
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