SRS Stanford Research Systems SR540 Optical Chopper Controller with 4 Hz to 3.7 kHz Range, 4-Digit Frequency Display and GPIB, RS-232, Ethernet Interfaces
The SR540 Optical Chopper Controller handles all your optical chopping requirements—from simple measurements to dual-beam and intermodulation experiments. Featuring a 4-digit frequency display, front-panel frequency control, analog voltage frequency control, and two reference outputs with selectable operating modes.
- Frequency range: 4 Hz to 3.7 kHz
- 4-digit frequency display with 1 Hz resolution and accuracy
- Front-panel frequency control with 10-turn potentiometer
- Analog voltage frequency control (0-10 VDC)
- Two reference outputs with multiple operating modes
- Includes two anodized aluminum blades: 5/6 slot and 25/30 slot
A single optical beam is chopped by either row of slots, with the corresponding reference output used to lock the lock-in amplifier to the chop frequency.
Output from a single source is split and chopped at two different frequencies. One beam passes through the experiment while the other serves as a reference beam, with signals detected at different frequencies for improved measurement accuracy.
| 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 (typical) |
| 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 |
| Reference Modes | ƒinner, ƒouter, 5 × ƒouter, ƒinner + ƒouter, ƒouter - ƒinner |
| Dimensions | Controller: 7.7" × 1.8" × 5.1" (WHL) Chopper head: 2.8" × 2.1" × 1.0" (WHL) |
| Blade Diameter | 4.04" ±0.002" |
| Power | 12 W, 100/120/220/240 VAC, 50/60 Hz |
| Warranty | One year parts and labor on defects in materials and workmanship, 90 days on motor |
- SR540 - Optical chopper
- O5402530 - 25/30 dual-slot replacement blade
- O54056 - 5/6 dual-slot replacement blade
- O5405 - 5-slot replacement blade
- O54030 - 30-slot replacement blade
- O540RCH - Replacement chopper head
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