SRS Stanford Research Systems Model SRS540 Optical Chopper
Controller 4 Hz to 3.7 kHz
Description of SRS Stanford Research Systems SRS540 Optical Chopper Controller
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
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.
Features of SRS Stanford Research Systems SRS540 Optical Chopper Controller
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.
Specification of SRS540
| 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. |
Ordering Information for SRS540
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
FAQ:
1.Can you ship order to Canada or Australia?
Yes,we can .We send orders worldwide.
2. What delivery method do you use? and delivery time?
We can ship by EMS,DHL,FedEx,UPS,TNT with tracking number. Usual
delivery time is 4-7 workdays.
3. What is your payment term?
100% T/T payment before shipment.
4. How can I ask any other question?
You can contact us online or leave us messages below.
