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Precision Force Balance Angular Accelerometers
The two Columbia Models named SR-220RNP and SR-220RNC are precision force balance angular accelerometers that have been specifically developed for applications where space is at a premium. The Columbia patented HP suspension system offers very high-end toughness and outstanding rejection of linear acceleration.
The two designs vary only in their electrical interface. The SR-220RNP offers solder pins and the SR-220RNC integrates a 4-pin connector. Such accelerometers do not rely on rotational inertia or fluid damping but are damped electrically.
This leads to remarkable high-frequency characteristics for an angular accelerometer in its range of sensitivity. The design of the servo loop ensures excellent thermal stability of scale factor, zero biasand frequency characteristics. Users can discuss with the factory for customized versions of such sensors.
Lightweight/Small size
Damping is done electronically
Tough construction
Image Credit: Columbia Research Laboratories
Specifications
Table 1. Source: Columbia Research Laboratories
| Operational | SR-220RNP | SR-220RNC |
|---|---|---|
| Ranges Available | ±100, ±500, ±1000, ±5000 Rad/Sec2 | |
| Output Voltage | ±5 Volts into 100 K Load | |
| Excitation | ±15 VDC <20 mA | |
| Output Impedance | <500 Ohms | |
| Sensitive Axis Alignment | 0.5 Deg | |
| Scale Factor Tolerance | ±1% | |
| Scale Factor Temp Coefficient | 0.05% / Deg C Max. | |
| Zero Bias | ±10 mV | |
| Null Temp Sensitivity | ±0.1 mV / Deg C | |
| Natural Frequency | 50 To 200 Hz Dependent Upon Range | |
| Damping | 0.7 ±0.2 | |
| Linear Acceleration Sensitivity | 0.3% F.R./ G | |
| Cross Axis Sensitivity | ±2% | |
| Output Noise(DC To 400 Hz) | <0.02% F.R. | |
| Non-Linearity | ±0.01% F.R. | |
| Hysteresis & Non-Repeatability | ±0.25% F.R. | |
| Threshold & Resolution | 0.005% F.R. | |
| Environmental | SR-220RNP | SR-220RNC |
|---|---|---|
| Temperature, Operating | -50 To +85 Deg C | |
| Temperature, Storage | -55 To +95 Deg C | |
| Vibration Survival(2 To 2,000 Hz) | 10 G RMS,0.5” Disp D.A. | |
| Linear Acceleration SurvivalRange +100 Rad/Sec2All Other Ranges | 100 G150 G | |
| Shock Survival | 500 G, 1 mSec | |
| Ambient Pressure | 0 To 7 Atmospheres | |
| Humidity | 95% R.H. | |
| Physical | SR-220RNP | SR-220RNC |
|---|---|---|
| Weight | 4 Oz (113 Gms) | 4.3 Oz (122 Gms) |
| Size(Excluding Stud Mount & I/O Termination) | 1.35 In. Dia. x 1.75 In. H(3.4 cm Dia. x 4.5 cm H) | |
| Case Material | Stainless Steel | |
| Sealing | Environmental | |
| Connector | Solder Pins | PT1H-8-4P or Equiv. |
| Optional Mating Connector | N/A | PT06A-8-4S or Equiv. |
I/O Pin Functions
Model SR-220RNP
Table 2. Source: Columbia Research Laboratories
| Pin | Function |
|---|---|
| A | +15 VDC |
| B | Ground |
| C | -15 VDC |
| D | Eo (Voltage Out) |
Model SR-220RNC
Table 3. Source: Columbia Research Laboratories
| Pin | Function |
|---|---|
| A | Sig & Pwr Grd |
| B | +15 VDC |
| C | -15 VDC |
| D | Signal Output |
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