Linear Accelerometers: Seismic Event Sensors

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 OutputA.C. CoupledD.C. Coupled	<5 mV<1 mG
Null Temp Sensitivity	75 μV./ Deg C
Natural Frequency	100 to 200 HzDependent 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

Linear Accelerometers: Seismic Event Sensors

Image Credit: Columbia Research Laboratories, Inc.

SA-307LN Outline

Linear Accelerometers: Seismic Event Sensors

Image Credit: Columbia Research Laboratories, Inc.

Z Option

Linear Accelerometers: Seismic Event Sensors

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

标签：Accelerometers

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