Models SA-207LN and SA-307LN from Columbia Servo Accelerometers are low-noise, high-sensitivity sensors used in seismic and low-level, low-frequency motion research. The accelerometers are self-contained and generate a high-level, low-impedance signal. In most cases, signal conditioning is unnecessary.
These multi-axis sensors, like the single-axis SA-107LN, provide readings in the low-frequency micro-G region. Apart from the usual DC-coupled zero output, the SA-207LN and SA-307LN Accelerometers also provide an AC-coupled zero output that removes tilt-induced or offset errors while also allowing for significant amplification of the fundamental output.
Note: Exports of accelerometers from the United States are subjected to the Export Administration Regulations (EAR) and/or the International Traffic in Arms Regulations (ITAR) authorization procedures.
- Two or three axes
- Ultra-low noise
- Seismic event sensors
- High-level output
Specifications
Operational
Table 1. Source: Columbia Research Laboratories, Inc.
| Operational |
SA-207LN |
SA-307LN |
| Ranges Available |
+0.1 G to +2 G |
+0.5 G to +2 G |
| Output Voltage |
+7.5 Volts into 100 K Load |
| Excitation |
+12 to +15 VDC
<20 mA |
+12 to +15 VDC
<30 mA |
| Output Impedance |
<1000 Ohms |
| Sensitive Axis Alignment |
Better Than 0.25 Deg |
| Scale Factor Tolerance |
+1% |
| Scale Factor Temp Coefficient |
0.01% / Deg C Max. |
Zero Output
A.C. Coupled
D.C. Coupled |
<5 mV
<1 mG |
| Null Temp Sensitivity |
75 μV./ Deg C |
| Natural Frequency |
100 to 200 Hz
Dependent Upon Range |
| Damping |
0.7 +0.1 |
| Cross Axis Sensitivity |
0.002 G/G Exclusive of Sensitive Axis Alignment |
| Output Noise |
<2.5 μV RMS From 0 to 50 Hz |
| Non-Linearity |
<+0.1% F.R. |
| Hysteresis & Non-Repeatability |
<0.5 mG |
| Threshold & Resolution |
Better Than 1 μG |
Environmental
Table 2. Source: Columbia Research Laboratories, Inc.
| Environmental |
SA-207LN |
SA-307LN |
| Temperature, Operating |
-40 to +80 Deg C |
| Temperature, Storage |
-50 to +90 Deg C |
| Vibration Survival (2 to 2,000 Hz) |
5 G RMS, 0.5” Disp D.A. |
| Shock Survival |
200 G, 5 mSec (1/2 Sine) |
| Ambient Pressure |
0 to 5 Atmospheres |
| Humidity |
95% R.H. |
Physical
Table 3. Source: Columbia Research Laboratories, Inc.
| Physical |
SA-207LN |
SA-307LN |
| Weight |
8 Oz (227 Gm) |
12 Oz (340 Gm) |
| Size |
3.31 In L x 2.80 In W x 2.00 In H
(8.4 cm L x 7.1 cm W x 5.1 cm H) |
4.06 In L x 3.13 In W x 2.13 In H
(10.3 cm L x 7.9 cm W x 5.4 cm H) |
| Case Material |
Anodized Aluminum |
| Sealing |
Environmental |
| Electrical Interface |
7 Terminal Pins |
MS3443412-10P or Equiv. |
| Optional Mating Connector |
N/A |
PT06A-12-10S(SR) |
SA-207LN Outline
Image Credit: Columbia Research Laboratories, Inc.
SA-307LN Outline
Image Credit: Columbia Research Laboratories, Inc.
Z Option
Image Credit: Columbia Research Laboratories, Inc.
I/O Terminal Pin Functions
Table 4. Source: Columbia Research Laboratories, Inc.
| SA-207LN |
SA-307LN |
| Pin |
Function |
Pin |
Function |
| A |
+15 VDC |
A |
+15 VDC |
| B |
Ground |
B |
Ground |
| C |
-15 VDC |
C |
-15 VDC |
| D |
DC Output X |
D |
DC Output X |
| E |
AC Output X |
E |
AC Output X |
| F |
DC Output Y |
F |
DC Output Y |
| G |
AC Output Y |
G |
AC Output Y |
| |
|
H |
DC Output Z |
| |
|
J |
AC Output Z |