418F Optical Chopper & Control Unit
Electrical
| Chopping Frequency with 2-slot blade | 10Hz to 250Hz |
| Chopping Frequency with 5-slot blade | 12.5Hz - 500Hz |
| Chopping Frequency with 10-slot blade | 25 Hz to 1kHz |
| Chopping Frequency with 30-slot blade | 75 Hz to 3kHz |
| Phase Jitter with 2-slot blade | 0.6° pk-pk over entire frequency range. |
| Phase Jitter with 5-, 10- and 30-slot blades | 1° pk-pk over entire frequency range. |
| Reference Output | 800mV positive going wave from 200W, sensed by IR LED/Photodiode mounted on chopping head |
| Resolution | 1Hz with 10-slot disc |
| Motor | High quality 11-pole DC motor with precious metal commutator |
| Temperature Dependence of Frequency Stability | Less than 0.01% change per K |
| Line Voltage Dependence of Frequency Stability | Less than 0.01% change results from a change in line voltage from 190V to 265/ 95V to 130V |
