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Optical chopper - 4 Hz - 3.7 kHz | SR540
The SR540 Chopper is great for any optical chopping needs, including anything from simple measurements to inter modulation experiments as well as dual-beam. It has a four-digit frequency display, analog voltage frequency control, two reference outputs with varying operating modes and a front-panel frequency control. A five/six-slot blade is provided for frequencies up to 400Hz and a 25/30-slot blade for frequencies up to 3.7kHz, both of which are anodized aluminum for maximum durability. Also provided are reference outputs for corresponding frequencies to each row of slots and the sum or difference of frequencies.