- Products
- Prices & Ordering
- Downloads
- Support
- Contact Us
| Search |
| Home > Products > Scientific Instruments > SR540 |
|
| Optical Chopper | SR540 ... from $1195 |
| SR540 — Low jitter optical chopper | |
| (Click to enlarge) |
SR540 Optical Chopper
|
| 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. |
| Related Products > SR830 Lock-In Amplifier > SR530 Lock-In Amplifier > SR124 Lock-In Amplifier > SR850 Lock-In Amplifier |
| Downloads Datasheet User's Manual |
| $ Prices |
- Features
- Specifications
SR540 Optical Chopper
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 Applications
Single-Beam Experiment
In this application, a single optical beam is chopped by the outer
row of slots, and the reference output from the right BNC is used
to lock the lock-in amplifier to the chop frequency. The inner row
of slots could also be used, in which case the left BNC would be
the reference output. In either case, the REFERENCE MODE switch
is in the “up” position.
Dual-Beam Experiment
In this arrangement, the output from a single source is split and
chopped at two different frequencies by the two rows of chopper
slots. One beam passes through the experiment while the other is
used as a reference beam. The beams are recombined and sent to the
same detector. Two lock-ins are used to detect the signals at ƒinner,
corresponding to the experimental signal, and ƒouter,
corresponding to the reference beam. If the detected signal in the
experimental arm is ratioed to the detected signal in the control
arm, then effects due to changing source intensity and detector
efficiency are removed.
| SR540 Optical Chopper | |
| General | |
| 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" (WHL) Chopper head: 2.8" × 2.1" × 1.0" (WHL) |
| 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 defects in materials and workmanship, 90 days on motor. |
| Power | 10 W, 100/120/220/240 VAC, 50/60 Hz |
| Warranty | One year parts and labor on defects in materials and workmanship |
|
|