Accelerometers
2-28 Accelerometer Selection Guide–Amplified
Model 3140
• Vibration/Shock Monitoring
• Geophysical Monitoring
• Modal Analysis
• Structural Analysis
• Elevator Ride Control
Signal Conditioned Accelerometer
0.5 to 4.5 VDC Output
Intergral Temperature Compensation
High Performance
DESCRIPTION
The Model 3140 is a high performance accelerometer intended
for instrumentation applications. The 3140 provides a fully
signal conditioned output with performance similar to traditional
instrumentation accelerometers but at a much lower cost.
The accelerometer consists of a silicon micro machined
accelerometer with signal conditioning electronics in a
lightweight Valox™ housing that can be easily attached to a
mounting surface.
The sensing element is 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 overrange stops. This design provides for a very low
profile, high shock resistance, durability and built-in damping
over a wide usable bandwidth.
Alower cost version of the 3140 is available for applications
that do not require the temperature performance offered with the
3140. Please refer to the Model 3145 for additional information.
FEATURES
•Bolt Mount
•±0.5% Non-linearity (typical)
•±2.0% Temperature Performance
•DC Response
•Built-in Damping
•Built-in Overrange Stops
•Low Power
STANDARD RANGES
Range g
±2 •
±5 •
±10 •
±20 •
±50 •
±100 •
DIMENTIONS
Internet:www.msiusa.com
Tel: 1-757-766-1500
North America Toll Free: 1-800-745-8008
Fax: 1-757-766-4297
Accelerometers
Accelerometer Selection Guide–Amplified 2-29
Signal Conditioned Accelerometer
Model 3140
3140 - 002
Acceleration Range
Model
CONNECTIONS
PERFORMANCE SPECIFICATIONS
Supply Voltage: 12 VDC
Ambient Temperature: 25°C (Unless otherwise specified)
RANGE
______________________________________________________________________________________________________
PARAMETERS ±2g ±5g ±10g ±20g ±50g ±100g
__________________________________________________________________________________________________________________________________________________
Frequency Response [MIN] 0-200 0-300 0-400 0-500 0-600 0-1500
__________________________________________________________________________________________________________________________________________________
Mounted Resonant Frequency [MIN] 450 600 950 1500 2750 3000
__________________________________________________________________________________________________________________________________________________
Sensitivity (MIN/MAX) 1 V/g 400mV/g 200mV/g 100mV/g 40mV/g 20mV/g
PARAMETERS MIN TYP MAX UNITS NOTES
__________________________________________________________________________________________________________________________________________________
Full Scale Output Span 3.92 4.00 4.08 Volts 1, 2
__________________________________________________________________________________________________________________________________________________
Zero Acceleration Output 2.46 2.50 2.54 Volts 1, 2
__________________________________________________________________________________________________________________________________________________
Accuracy 0.5 1.0 ±% Span 3
__________________________________________________________________________________________________________________________________________________
Transverse Sensitivity 1.0 3.0 ±% Span
__________________________________________________________________________________________________________________________________________________
Temperature Error - Span (-20 to 85°C) 1.0 2.5 ±% Span 2, 4
__________________________________________________________________________________________________________________________________________________
Temperature Error - Zero (-20 to 85°C) 1.0 2.0 ±% Span 2, 4
__________________________________________________________________________________________________________________________________________________
Supply Voltage 8.0 12.0 30.0 Volts
__________________________________________________________________________________________________________________________________________________
Supply Current 5.0 mA
__________________________________________________________________________________________________________________________________________________
Reference Voltage 2.5 Volts 5
__________________________________________________________________________________________________________________________________________________
Output Resistance 0.1 Ω
__________________________________________________________________________________________________________________________________________________
Output Noise 0.5 mV p-p 6
__________________________________________________________________________________________________________________________________________________
Output Load Resistance 5 kΩ
__________________________________________________________________________________________________________________________________________________
Acceleration Limits 20X Rated
__________________________________________________________________________________________________________________________________________________
Operating Temperature -20°C to +85°C
__________________________________________________________________________________________________________________________________________________
Storage Temperature -40°C to +125°C
__________________________________________________________________________________________________________________________________________________
Weight (Including Cable) 13 Grams
1. The output voltage increases from the Zero Acceleration Output for positive accel-
eration and decreases for negative acceleration. The sensitivity is then 2V/Range.
For example, the ±5g range has a sensitivity of 2V/5g or 400mV/g.
2. Actual test data for this parameter is included on the calibration sheet provided
with each sensor.
3. Includes repeatability, hysteresis, and linearity (best fit straight line).
4. Compensated temperature range: -20°C to +85°C in reference to 25°C.
5. Pin 2 provides an optional 2.5V reference which may be used, if desired, to pro-
vide a stable zero-g reference. Thus, the full scale differential output between Pin 2
and Pin 4 would be ± 2 VDC. If a single ended output signal is preferred (0.5-4.5
VDC), make no connection to Pin 2. To avoid damage to the internal voltage regu-
lator, do not connect Pin 2 to Pin 1 (gnd). Minimum load resistance connected to
Pin 2 without affecting output is 100 k
6. 10 Hz to 1 kHz.
7. To use an alternate electrical connector, refer to the following color code for prop-
er electrical connections: Pin 1 - Green; Pin 2 - Yellow; Pin 3 - Red; Pin 4 - Blue;
Pin 5 - Shield. Note: Removing the connector voids the product warranty.
8. The useful frequency range is defined as the range of frequencies over
which the device sensitivity is within ±5% of the DC value.
Notes
ORDERING INFORMATION
Dec 2002
*Notch on connector to indicate pin one.
*
