Motorized Filter Wheel Chapter 4: Basic Operation
Rev H, October 2, 2014 Page 9
Aperture
4.4.
The unit has two aperture locations labeled “A” and “B” for the 0° (12 o’clock position) and 210° (7 o’clock
position), respectively (see Figure 3 below). The A/B switch on the side of the unit selects the aperture.
Figure 4 Filter Wheel Apertures
Manual Control
4.5.
Pushing the ▲ / ▼ arrow buttons on the top of the unit will adjust the filter location. The arrows indicate the
direction of the wheel’s rotation, and the display will indicate the filter selection. The display brightness can be
adjusted using a small screwdriver at the hole marked DIM (see figure 5).
Figure 5 DIM Display Brightness
External Trigger
4.6.
The unit may be remotely triggered to advance to the next position. This is done by applying an active low pulse
to the BNC trigger input. The input is TTL compatible and should not exceed 5 V. Because the input is internally
pulled up, the trigger will operate with a passive connection to ground. The trigger mode defaults on power up to
an input mode. Software provisioning can, however, change the trigger mode to an output mode. In the output
mode, the unit generates an active high 10 ms pulse (TTL level) to indicate that the wheel has completed its
rotation to the selected position. This pulse may be used to activate other equipment. The trigger can be changed
to the output mode from the application software or by sending the command “Trig=1” over the USB interface.
SM1 (Ø1.035"-40)
Thread 0.15"
Deep
2 Places Both Sides
(29.46
mm)
1.16"
(25.52
mm)
1.00"
210°
0°
(14.73
mm)
0.58"
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