SRS Labs Nitrogen Laser NL100, Руководство по эксплуатации и обслуживанию

Страница: 14 / 25

4 Operation
NL100 Nitrogen Laser
Trigger In
When the RATE switch is in the OFF position (see RATE below), the NL100 is triggered
by a TTL pulse at this BNC connector. The laser will fire the laser on the rising edge of
the TTL pulse. The width required of the TTL pulse depends on whether the laser is
being operated in COMMAND CHARGE or AUTO CHARGE mode. (See DB-9
CONNECTOR below for information on how to configure the laser in either
COMMAND CHARGE or AUTO CHARGE modes).
In AUTO CHARGE mode, the falling edge of the trigger pulse has no effect on the
operation of the NL100 laser system, as shown in Figure 10. The trigger pulse width
should be > 1
µ
s. The high voltage charging circuitry becomes active immediately after
the laser has fired.
time
laser output
trigger pulse
high voltage
Figure 10. Timing diagram of AUTO CHARGE mode. Note that time is not shown to scale and the
diagram does not reflect triggering delays, etc.
In COMMAND CHARGE mode, high voltage charging circuitry becomes active only
when a TTL low appears on the trigger input, as depicted in Figure 11. To allow for
complete high voltage charging In this case, the dwell time of the trigger pulse must be
>45 ms. In other words, the trigger must be TTL low for >45 ms in COMMAND
CHARGE mode.