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SR540 Optical Chopper

SR540 Optical Chopper
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Optical Chopper SR540 — Optical chopper system · 4 Hz to 3.7 kHz chopping frequencies · Low phase jitter · Single and dual beam experiments · Sum & difference reference outputs · SR540 ... $1195 (U.S. list) SR540 Specifications The SR540 chopper will handle all your optical chopping requirements — from simple measurements to dual-beam and intermodulation experiments. The SR540 has a 4-digit frequency display, front-panel frequency control, analog voltage frequency control, and two reference outputs with selectable operating modes. Two anodized aluminum blades are provided: a 5/6 slot blade for frequencies up to 400 Hz, and a 25/30 slot blade for frequencies up to 3.7 kHz. Reference outputs are provided for frequencies corresponding to each row of slots, as well as the sum and difference frequencies. Optical chopper 25/30 dual-slot replacement blade 5/6 dual-slot replacement blade 5-slot replacement blade 30-slot replacement blade Replacement chopper head Stanford Research Systems Chop frequency 4 Hz to 400 Hz (5/6 slot blade) 400 Hz to 3.7 kHz (25/30 slot blade) Frequency stability 250 ppm/°C (typ.) Frequency drift <2 %, 100 Hz < f < 3700 Hz Phase jitter (rms) 0.2° (50 Hz to 400 Hz) 0.5° (400 Hz to 3.7 kHz) Frequency display 4-digit, 1 Hz resolution and accuracy Frequency control 10-turn pot with 3 ranges: 4 Hz to 40 Hz 40 Hz to 400 Hz 400 Hz to 3.7 kHz Input control voltage 0 to 10 VDC for 0 to 100 % of full scale. Control voltage overrides frequency dial. Reference modes ƒinner, ƒouter, 5 × ƒouter, ƒinner + ƒouter, ƒouter – ƒinner Dimensions Controller: 7.7" × 1.8" × 5.1" (WHD) Head: 2.8" × 2.1" × 1.0" (WHD) Blade diameter 4.04" ± 0.002" Cable length 6 ft. Power 12 W, 100/120/220/240 VAC, 50/60 Hz Warranty One year parts and labor on materials and workmanship, 90 days on motor

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