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Stanford Research Systems
SR540 Optical Chopper

SR540 Optical Chopper

Product catalog summary

Ordering Information
The document provides a list of products related to the SR540 Optical Chopper, including their prices. The main product, the SR540 Optical Chopper, is priced at $1195. Replacement blades and a replacement chopper head are also available, with prices ranging from $50 to $350.

Specifications
The SR540 Optical Chopper is designed for various optical chopping requirements, including simple measurements and dual-beam experiments. It features a 4-digit frequency display, front-panel frequency control, and analog voltage frequency control. The system includes two anodized aluminum blades: a 5/6 slot blade for frequencies up to 400 Hz and a 25/30 slot blade for frequencies up to 3.7 kHz. The chopper offers low phase jitter and supports single and dual beam experiments with sum and difference reference outputs.

Technical Details

Chop frequency ranges from 4 Hz to 3.7 kHz depending on the blade used.
Frequency stability is 250 ppm/°C (typical), with a frequency drift of less than 2% for frequencies between 100 Hz and 3700 Hz.
Phase jitter is 0.2° for 50 Hz to 400 Hz and 0.5° for 400 Hz to 3.7 kHz.
Frequency control is achieved via a 10-turn potentiometer with three ranges: 4 Hz to 40 Hz, 40 Hz to 400 Hz, and 400 Hz to 3.7 kHz.
Input control voltage ranges from 0 to 10 VDC, overriding the frequency dial.
Reference modes include ƒinner, ƒouter, 5 × ƒouter, ƒinner + ƒouter, and ƒouter – ƒinner.
Dimensions: Controller - 7.7" × 1.8" × 5.1"; Head - 2.8" × 2.1" × 1.0".
Blade diameter is 4.04" ± 0.002".
Cable length is 6 ft.
Power requirements are 12 W, with voltage options of 100/120/220/240 VAC at 50/60 Hz.
The warranty covers one year for parts and labor on materials and workmanship, and 90 days on the motor.

Catalog excerpts

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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