1.6 Alternate speed modes
1 – 11
Three alternate modes of operation are provided, each of which
guides the shutter along the same trajectory but at a slower rate.
This leads to a significant reduction in power usage and physical im-
pulse. These slower modes can be used in many applications where
absolute speed is not as crucial as minimizing vibration.
Mode
Transition time
Max Rate
0
5 ms
100 Hz
1
10 ms
50 Hz
2
20 ms
25 Hz
3
40 ms
12.5 Hz
Table 1.1: Model SR475 Laser Shutter speed modes
Mode
Transition time
Max Rate
0
4 ms
125 Hz
1
8 ms
62.5 Hz
2
16 ms
31.25 Hz
3
32 ms
15.625 Hz
Table 1.2: Model SR476 Laser Shutter speed modes
The actual transition times in the di
ff
erent modes for the SR475 and
SR476 Laser Shutters are given in Table 1.1 and Table 1.2, respectively.
Mode
0
is the full-speed mode, and modes
1
–
3
are alternate modes.
The corresponding maximum rates are for a full cycle including an
opening and closing transition.
The alternate modes can be selected using the remote interface; please
see
§
2.4 for more information.
SR475 and SR476 Laser Shutters
