Quantel Ultra Big Sky Laser Series User Manual page 36

32 | Contents | Operation
Flashlamp Q-Switch
Triggering Method Result
Setting Setting
External External An external source generates both the flashlamp
trigger and the Q-Switch trigger.
To use this mode::
1. From the Main menu, select the
Flashlamp
2. Set
3. Return to the
Q-Switch
4. Set
The Q-Switch activates at the same time as the
external Q-Switch trigger input.
Note: In "Bypass 0" mode, there is a processing delay
of 500 µsec between the external flashlamp trigger
input and the flashlamp activation. To compensate for
this interval, you must add 500 µsec to the total time
between your flashlamp input and your Q-Switch input.
See Figure 19 which shows an example of this delay,
and the compensated Q-Switch signal.
In "Bypass 1" mode, there is a processing delay of
only approximately 0.5 µsec between the external
flashlamp trigger input and the flashlamp activation.
See Figure 20 which shows an example of this delay,
and the compensated Q-Switch signal.
Note: The 100 µsec Q-Switch delay shown in Figure
19 and Figure 20 is only an example. Refer to the
Data Summary sheet that shipped with your system
for the optimized Q-Switch delay. You can query the
Q-Switch delay using the "W" command. See the
Software section for details.
Version M 22-April-2012
menu.
flash sync to EXT.
Main menu
and select the
menu.
QS Sync to EXT.
Flashlamp
trigger input
Flashlamp Sync output
(actual flashlamp
activation)
Q-Switch
trigger input
Figure 19 Example Signal Timing
For External/External Mode Bypass 0
Example: Signal Timing in External Mode
In this example, the desired Flashlamp-to-Q-Switch delay is 100 µsec. In Bypass 0
mode there is a 500 µsec processing delay, therefore the external Q-switch trigger
must occur 600 µsec after the rising edge of the external Flashlamp trigger.
WARNING: Refer to Figure
trigger pulse requirements.
Flashlamp
trigger input
Approximately 0.5 µsec processing delay
Flashlamp Sync output
(actual flashlamp
Desired Flashlamp-Q-Switch delay,
activation)
e.g. 100 µsec
Q-Switch
trigger input
Total time required from flashlamp trigger input
to Q-Switch trigger input: 100.5 µsec
Figure 20 Example Signal Timing
For External/External Mode Bypass 1
In this example, the desired Flashlamp-to-Q-Switch delay is 100 µsec. In Bypass 1
mode there is only approximately a 0.5 µsec processing delay, therefore the
external Q-switch trigger must occur 100.5 µsec after the rising edge of the external
Flashlamp trigger.
|
Ultra
500 µsec processing delay
Desired Flashlamp-Q-Switch delay,
e.g. 100 µsec
Total time required from flashlamp trigger input
to Q-Switch trigger input: 600 µsec
for proper external flashlamp and Q-Switch