Quantel Ultra Big Sky Laser Series User Manual page 28

24 | Contents | Operation
Scan Mode Example (scans 10, active 3, passive 2): With the
flashlamp running, press the "Q-Switch Start" button on the Remote
Box. Three active Q-Switch pulses will occur followed by two
"passive" flashlamp pulses. This pattern will repeat ten times. Each
of the ten "Scan" groups will consist of three flashlamp pulses with
an associated Q-Switch pulse followed by two flashlamp pulses
without a Q-Switch pulse. Shown below is a timing diagram that
illustrates Scan mode.
Flashlamp
Q-Switch
Figure 12 Example Timing Diagram for Scan Mode (QS Pulses = 3)
Ramp: In all Q-Switch modes, whenever the ramp count is not set
to zero, the Q-Switch delay "ramps" down from an initial value to a
final value.
The initial Q-Switch delay is given by the FLQS dly setting (from the
Q-Switch menu), added to the product of the number of ramp steps
multiplied by the ramp size. The final Q-Switch delay is equal to the
FLQS dly setting. Each time the Q-Switch pulses, the Q-Switch delay
is decreased by the step size until it reaches its final value. If the
ramp count is zero, no ramping occurs: the Q-Switch delay is always
the final value as specified by the FLQS dly setting.
Version M 22-April-2012
To set the ramp settings, from the Q-Switch menu, scroll the cursor
to the "Ramp" item and press the "Enter Menu" button to show the
Ramp menu items:
QS menu
>ramp ON
r. step
QS at run
QS menu:
return to the Q-Switch menu.
ramp ON:
setting is zero, no ramping occurs.
Scan
r. step:
group
QS at run:
repeats
automatically start running after you start the flashlamp and the
safety delay (typically 8 seconds) expires. With "QS at run" set to
ON, you do not have to press the Q-Switch Start button located on
the Remote Box to for lasing to begin.
CAUTION: Setting "QS at run" to ON is a potential safety risk as
the system lases without you pressing the Q-Switch Start button.
This feature has been intentionally located at the bottom of this
third-level menu to reduce the chance that it will be activated
accidentally.
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Ultra

000
010µsec
OFF
Scroll to this item and press the "Enter Menu" button to
Use this to specify the number of ramp steps. If this
Use this to specify the ramp step size in microseconds.
Set this item to ON, to cause the Q-Switch to