3502
Optical Chopper System
21
3.3.2
Connecting the Chopper Head to the Chopper Controller
Make sure that the power switch is in the
OFF
position. Connect the Chopper Head
to the Controller with the provided standard shielded Ethernet cable by plugging
the smaller modular connector of the cable into the Chopper Head and the larger
connector into the MOTOR input on the rear panel of the Chopper Controller.
3.3.3
Connecting the Chopper Controller to a Computer via USB
The Model 3502 Optical Chopper Controller can be connected to a computer with
a standard USB-A to USB-B cable for computer control and communication.
3.4
Operation
When the unit is turned on the unit performs a series of internal verifications, the
word
PASS
is briefly displayed on the 5-digit LED numeric display, and it shows
its driving frequency setpoint. The unit is then ready to operate the Chopper Head.
3.4.1
Front Panel Operation
The Model 3502 Optical Chopper can be operated manually by keying in control
functions from the Chopper Controller front panel shown below.
Figure 12:
Model 3502 Optical Chopper Controller front panel.
Wheel Button
The User may select from different wheels to accommodate the chopping
frequency of interest. Single- or double-slot wheels are provided for single- or
dual-path experiments. The table below summarizes the provided wheel selection
and each wheel’s chopping frequency range.