The following table shows chopping options. A couple options extend ranges on the 300 and 320 systems. The 320C and 320CD use blades with two series of slots and two output references are produced. The low frequency optical shutters and safety shutters can be open or shut on demand, with the following response time. The size beam on the rotating choppers is measured as the maximum diameter possible per blade.
Values listed are approximate.
The apertures on the boxing on the head of the 350 system are 9mm in diameter. With the 250mm blade, the optoswitch is removed and hence there is not reference signal. The 300P and 320 blade protectors apertures are 33mm in diameter. For the tuning fork choppers, maximum beam diameter depends upon the frequency for which the chopper is manufactured, as well as the duty cycle selected. Please see the Tuning Fork Tutorial for an explanation of duty cycles on tuning fork choppers.