SRS Labs Nitrogen Laser NL100, Руководство по эксплуатации и обслуживанию

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6 Operation
NL100 Nitrogen Laser
NOTE: When the laser system is in INTERNAL RATE mode, it is also in AUTO
CHARGE mode, regardless of the configuration of the DB-9 connector. When the laser is
in INTERNAL RATE mode, trigger pulses applied at either the TRIG IN BNC or the
EXT TRIG pin of the DB-9 connector have no effect on the operation of the laser.
DB-9 Connector
The female DB-9 connector provides a convenient way to interface to the NL100 laser’s
inputs and outputs. Below is a description of the function of each pin.
Pin 1 and Pin 2: +24V DC In
An alternate connection for providing electrical power to the NL100. Pins 1 and 2 are tied
together.
Pin 3: + CHARGE CONTROL
The NL100 laser system provides a +5V (0.1 mA, max) level at Pin 3. If left high, the
laser system will be in AUTO CHARGE mode. In AUTO CHARGE, the high voltage
charging system will begin to recharge the storage capacitor and spark gap immediately
after the laser fires. Use of the DB-9 connector labeled CCOFF provided with the NL100
will put the laser system in the AUTO CHARGE mode.
If Pin 3 is pulled low, the NL100 laser system will be in COMMAND CHARGE mode.
With COMMAND CHARGE, the high voltage charging begins only when a TTL high
level is received at one of the TRIGGER inputs (either the TRIG IN BNC or Pin 4 of the
DB-9). Since high voltage charging requires 45 ms, the Trigger pulse width must be
greater than 45 ms when COMMAND CHARGE is used. Use of the DB-9 connector
labeled CCON provided with the NL100 will put the laser system in the COMMAND
CHARGE mode.
Because COMMAND CHARGE reduces the amount of time key laser components are at
high voltage, especially at lower repetition rates, we recommend use of this mode where
possible.
Pin 4: +Trigger
Pin 4 provides an alternate connection for externally triggering the laser. Note that
because the EXTERNAL TRIGGER is optoisolated, the reference for the trigger, Pin 8: -
Trigger is isolated from GND. See TRIGGER IN above for additional information.
Pin 5: +Interlock
The laser system pr24V (10 mA, max.) level that must be terminated into Pin 9: -
Interlock or GND for the laser system to operate. The NL100 laser system is shipped with
two male DB-9 connectors, labeled CCON and CCOF, where this connection is provided.
NOTE: The laser will not operate if one of the provided male DB-9 connectors is not in
place and the Pin 5: +Interlock is not otherwise terminated!
This interlock is provided so that the user can control the laser system externally with a
door switch, for example.