Quantum Composers LDDC 1550 - Manual (Page 10)

5-10 | P a g e
Line 3: Width. This sets the pulse width (in seconds) of the triggering pulse to the driver when in
pulsed, burst or single shot mode. The width adjustment will be limited to a maximum of roughly
90% of the rate period.
Line 4: Count. This sets the number of shots when in burst mode. The unit will pulse this number
of times when in burst mode.
Q-Switch, External Trigger and Sync Page (LSC 1650 Only)
Q - S w i t c h : D i s a b l e
D e l a y : + 0 . 0 0 0 2 0 0 0
E x t T r i g : D i s a b l e
S y n c : D i s a b l e
The the q-sw/ext trigger/sync page will display options for enabling the q-sw trigger output, set
the q-sw trigger delay, set external triggering options and sync options. See the specifications
section pertaining to the LSC for details on the electrical and timing.
Line 1: Q-Switch. This will toggle between Enable and Disable for the q-switch trigger output
signal.
Line 2: Q-Switch Delay. This sets the amount of q-switch delay referenced from the falling edge
of the pulse control signal. This value can go positive or negative. Resolution is in 200ns
increments. There is a maxumum overal delay adjustment of 12.2 milliseconds or +/-6.1
milliseconds referenced from the falling edge. The delay amount will be limited based on the
pulse control width and period of the rep rate.
Line 3: External Trigger. This sets the external triggering option. The external trigger can be
used to start or stop the pulsing of the unit. How the unit operates in external trigger mode will
also depend on the pulse mode setting. The action can be set to either active high or active low
modes. Active high referes to a signal that transitions from a low state (0V) to a high state (>2V).
Active low referes to a signal that transitions from a high state (>2V) to a low state (0V). The
pulse mode setting will determine if the unit starts a sequence of pulses or only generates one
pulse. The various external triggering modes are:
Disable. This disables the external trigger and the unit is only triggered internally.
Start – Rising Edge. This will trigger the unit to start generating a pulse or sequence of
pulses on a rising edge signal.
Start – Falling Edge. This will trigger the unit to start generating a pulse or sequence of
pulses on a falling edge signal.
Stop – Rising Edge. This will stop the unit if it is already generating pulses when a rising
edge signal is received.
Start/Stop – Rising Edge. This will start the unit on the first received rising edge pulse
and then stop the unit on the next rising edge pulse. Basically two pulses would start then
stop the unit.
Start/Stop – Falling Edge. This will start the unit on the first received falling edge pulse
and then stop the unit on the next falling edge pulse. Basically two pulses would start
then stop the unit.
Gate Active High. The unit will start running as long as a high level (>2V) is present on
at the external trigge input.