Model 3031
PC Board Mountable Accelerometer
Millivolt Output
Small Size
Low Cost
Vibration/Shock Monitoring
Consumer Electronics
Patient Monitoring
Crash Recorder
DESCRIPTION
The Model 3031 is a piezoresistive silicon accelerometer in a
surface mount package. It is intended for high volume applica-
tions where small size, light weight, and low cost are required.
This accelerometer consists of a micro machined silicon
mass suspended by multiple beams from a silicon frame.
Piezoresistors located in the beams change their resistance as the
motion of the suspended mass changes the strain in the beams.
Silicon caps on the top and bottom of the device are added to
provide over-range stops. This design provides for a very low
profile, high shock resistance, durability and built-in damping
over a wide usable bandwidth.
For non-surface mount accelerometers please see the
Models 3022, 3028, 3052 or 3058.
FEATURES
Surface Mount Package
±0.5% Non-linearity (typical)
±1.0% Temperature Performance
(with comp resistors—typical)
DC Response
Built-in Damping
Built-in Overrange Stops
Low Power
DIMENSIONS
STANDARD RANGES
Range
±50
±100
±200
±500
g
●
●
●
●
2-6
Accelerometer – Unamplified
PC Board Mountable Accelerometer
PERFORMANCE SPECIFICATIONS
Supply Voltage: 5.0 VDC
Ambient Temperature: 25°C (Unless otherwise specified)
RANGE
PARAMETERS
Frequency Response [MIN]
Mounted Resonant Frequency [MIN]
Sensitivity (MIN/MAX)
PARAMETERS
Zero Acceleration Output
Damping Ratio
Non-linearity
Transverse Sensitivity
Input & Output Resistance
Temperature Error - Span
Temperature Error - Zero
Supply Voltage
Output Noise
Output Load Resistance
Acceleration Limits (Any Direction)
Operating Temperature
Storage Temperature
Weight
-40°C to +125°C
-55°C to +150°C
0.3 Grams
5
20X
2.5
0.4
±50G
0-1000
2000
0.6/1.5
MIN
±100G
0-1500
3000
0.3/0.6
TYP
5
0.7
0.5
1
3.5
1.0
1.0
5.0
1.0
±200G
0-2000
4000
0.15/0.3
±500G
0-2400
5000
0.06/0.15
MAX
25
0.9
1
3
6.5
2.0
2.0
10.0
Model 3031
UNITS
Hz
Hz
mV/g
UNITS
±mV
NOTES
1
2
NOTES
±% Span
±% Span
k
Ω
±% Span
±% Span
VDC
µV p-p
M
Ω
Rated
3
4, 5
4, 5
6
7
Notes
1. The frequency response is defined as the range of frequencies over
which the device sensitivity is within ±5% of the DC value.
2.
3.
4.
Output voltage increases for positive acceleration; output voltage
decreases for negative acceleration.
Best Fit Straight Line.
Percentage values are with external compensation.
5.
6.
7.
8.
Compensated temperature range: 0-50°C in reference to 25°C.
10 Hz to 1 kHz.
20X or 2000g, whichever is less.
Solder on pads is 62% Tin, 36% Lead, 2% Silver. Maximum allowable
temperature during mounting is 220°C for 1 minute. Contact factory if a
higher mounting temperature will be used.
ORDERING INFORMATION
CONNECTIONS
June 2001
Accelerometer – Unamplified
Feel free to contact customer service with any questions at
Toll free 1(800)745-8008; Phone (757)766-1500; Fax (757)766-4297
2-7
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