1 – 6
Operation
the shutter head enters standby mode, the
+
12 VDC power should
be kept low for at least three seconds. Once in
Standby
mode, the
shutter head will remain so until reset.
Note: The
+
4.5 VDC “logic” power supply is always provided to a
shutter while it is connected to a powered-on SRS shutter controller
such as the SR470 Shutter Controller or the SR474 Four-Channel
Shutter Driver. Placing a shutter drive channel on one of these in-
struments into the “o
ff
” or “sleep” states will put a SR475 or SR476
attached to that channel into the
Standby
mode.
1.1.5
Power-on state
At turn-on, the SR475 or SR476 executes a brief mechanical initial-
ization to verify motor function and perform the initial servo-lock
of the shutter blade position. This can potentially last several sec-
onds and
/
or involve minor mechanical bumps in excess of normal
operation.
All settings and modes of the SR475 and SR476 are in volatile mem-
ory, and at power-on the instrument always returns to its default
state.
1.1.6
Resetting the shutter head
The SR475 and SR476 can be reset by turning o
ff
and restoring the
+
4.5 VDC power supply, through a remote command to reset the
shutter head, or by restoring the
+
12 VDC power supply after it has
been turned o
ff
.
1.2
Mounting
SR475 and SR476 Laser Shutters can be mounted and operated in
any orientation. 8-32 mounting holes are provided on three sides of
the shutter head, and a single 1
/
4
−
20 mounting hole is provided on
the bottom side, as shown in Fig. 1.3.
Orientation may be chosen for convenient routing of the shutter
cable, for aligning to the appropriate beam height above an optical
table, or for pulsing one of two closely separated laser beams.
1.2.1
Vibration considerations
SR475 and SR476 Laser Shutters should be firmly mounted to a solid
surface. Using long and
/
or narrow mounting posts will increase the
apparent vibration induced by the shutter.
SR475 and SR476 Laser Shutters
