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Angular Accelerometers for Rotational Studies
Models SR-100FR and SR-200RFR from Columbia Angular Accelerometers have been developed specifically for low-level near DC applications.
Such sensors tend to incorporate the fluid rotor idea to offer extremely high sensitivity and complete scale ranges as low as +/–0.01 radians/second2. The high-performance torquer design holds reliability and ruggedness in extreme vibration and shock surroundings.
The Model SR-100FR functions from a +/–15 V power source and consists of an output span of +/–5 volts for full-scale input. The Model SR-200RFR features the same sensor system as the SR-100FR but offers electronics that function from a +24 to +32 volt aircraft supply and supplies 0 to 5 V output.
Both units are entirely self-contained and need no extra amplification or conditioning. Applications for such high sensitivity accelerometers consist of rotational studies or stabilization of structures, antennas, chipsand platforms.
High sensitivity
High-performance fluid rotor design
Image Credit: Columbia Research Laboratories
Specifications
Table 1. Source: Columbia Research Laboratories
| Operational | SR-100FR | SR-200RFR |
|---|---|---|
| Ranges Available | ±0.1 To ±5 Rad / Sec2 | |
| Output Voltage | ±5 Voltsinto 100 K Load | 0.2 To 4.8 VDCinto 100 K Load |
| Excitation | ±15 VDC<20 mA | +24 To +32 VDC<30 mA |
| Output Impedance | 5,000 Ohms Typical | |
| Sensitive Axis Alignment | 0.5 Deg | |
| Scale Factor Tolerance | ±1% | |
| Scale Factor Temp Coefficient | 0.054% / Deg C | 0.07% / Deg C |
| Zero Bias | 2 mRad / Sec2 Max. | 2.5 ±0.01 VDC |
| Null Temp Sensitivity | 45 µRad / Sec2/Deg C | 60 µRad / Sec2/Deg C |
| Natural Frequency | 10 Hz Min. | |
| Damping Ratio | 0.6 To 1 | |
| Linear Acceleration Sensitivity | 10 mRad / Sec2 / G | |
| Cross Axis Sensitivity | <0.5% | |
| Output Noise | 2 mRad / Sec2 RMS | |
| Non-Linearity | ±0.1% F.R. | |
| Hysteresis & Non-Repeatability | ±0.1% F.R. ±0.2% F.R. | |
| Threshold & Resolution | 0.001% F.R. | |
| Environmental | SR-100FR | SR-200RFR |
|---|---|---|
| Temperature, Operating | -40 To +71 Deg C | |
| Temperature, Storage | -40 To +71 Deg C | |
| Vibration Survival(2 To 2,000 Hz) | 10 G RMS,0.5” Disp D.A. | |
| Linear Acceleration Survival | 100 G | |
| Shock Survival | 100 G, 11 mSec | |
| Ambient Pressure | 0 To 5 Atmospheres | |
| Humidity | 95% R.H. | |
| Physical | SR-100FR | SR-200RFR |
|---|---|---|
| Weight | 3.5 Lbs. Max (1.58 KG) | |
| Size | 6.56 In. Dia. x 2.375 In. H (16.7 cm Dia. x 6.0 cm H) | |
| Case Material | Anodized Aluminum | |
| Sealing | Environmental | |
| Connector | DT07H-12-8PN or Equiv. | PTIH-10-6P or Equiv. |
| Optional Mating Connector | PT06A-12-8S or Equiv. | PT06A-10-6S or Equiv. |
I/O Connector Pin Functions
SR-100FR
Table 2. Source: Columbia Research Laboratories
| Pin | Function |
|---|---|
| A | Sig & Pwr Return |
| B | Current Output |
| C | Signal Output |
| D | Test – |
| E | -15 VDC |
| F | +15 VDC |
| G | Test + |
| H | Spare |
SR-200RFR
Table 3. Source: Columbia Research Laboratories
| Pin | Function |
|---|---|
| A | Sig & Pwr Grd |
| B | +28V Input |
| C | Test |
| D | Eo (Voltage Out) |
| E | I o (Current Out) |
| F | I o (Current Ret) |
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