218M Optical Chopper & Control Module

Electrical

Chopping Frequency with 2-slot blade

10Hz to 250Hz

Chopping Frequency with 5-slot blade

12.5Hz to 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° peak-to-peak over entire frequency range.

Phase Jitter with 5-, 10- and 30-slot blades

1° peak-to-peak over entire frequency range.

Reference Output

3V peak-to-peak square wave with 1kΩ output impedance

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

Interface & Mechanical

Control

Front panel

Front Panel Controlled Features

Chopping frequency set, chopper on/off

Dimensions

Single width module, 3U high

Connector

Amphenol (chopper), BNC (reference)

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