Accelerometers
2-10 Accelerometer Selection Guide–Unamplified
Model 3022
• Vibration/Shock Monitoring
• Modal Analysis
• Motion Control
• Crash Testing
• Aerospace
PC Board Mountable Accelerometer
Millivolt Output
Low Cost
DESCRIPTION
The Model 3022 is a piezoresistive silicon accelerometer. The
package is a ceramic substrate with a sealed ceramic cover.
The ceramic provides an excellent bonding surface for the
customers application specific adhesive. Each accelerometer
includes a detailed calibration sheet, which provides test data
and resistor compensation values for each sensor.
The 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. Each sensor is indi-
vidually serialized.
For an accelerometer with a mounting bracket designed to
bolt the sensor to a mounting location, see the Model 3028.
Please refer to the Models 3052 and 3058 for accelerometers
with integral temperature compensation.
FEATURES
•Designed for Adhesive Mounting
•±0.5% Non-linearity (typical)
•±1.0% Temperature Performance
(with comp resistors-typical)
•DC Response
•Built-in Damping
•Built-in Over-range Stops
•Low Power
•Pins or No Pins
STANDARD RANGES
Range g Range g
±2 •±50 •
±5 •±100 •
±10 •±200 •
±20 •±500 •
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–Unamplified 2-11
PC Board Mountable Accelerometer
Model 3022
CALIBRATION DATA
Acalibration data sheet similar to the sample shown
above is included with each unit. The calibration
sheet provides the measured test and calibration
data for the sensor. In addition to the test data, the
values of calibration and temperature compensation
resistors are also included.
Figure 1. Calibration Data Sheet
SIGNAL CONDITIONING
Figure 2. Typical Temperature Compensation and Amplification Circuit (component values specified for each sensor)
• Rstc sets the excitation voltage ramp to compensate the sensitivity
error due to temperature.
• Rset sets the excitation voltage to 5V at 25°C.
• Rzb1, Rzb2 and Rztc1 and Rztc2 calibrate the zero offset and
compensate the offset error due to temperature.
• Rs calibrates the output span.
• Vcc must be >8 VDC.
Q1: 2N3904
CR1: 1N914 or equivalent
Op Amps: LT1014, LM324 or equivalent
Dec 2002
Accelerometers
2-12 Accelerometer Selection Guide–Unamplified
Model 3022
PC Board Mountable Accelerometer
PERFORMANCE SPECIFICATIONS
Supply Voltage: 5.0 VDC
Ambient Temperature: 25°C (Unless otherwise specified)
RANGE
______________________________________________________________
PARAMETERS ±2G ±5G ±10G ±20G UNITS NOTES
__________________________________________________________________________________________________________________________________________________
Frequency Response [MIN] 0-250 0-300 0-400 0-600 Hz 1, 9
__________________________________________________________________________________________________________________________________________________
Mounted Resonant Frequency [MIN] 700 800 1000 1500 Hz 8, 9
__________________________________________________________________________________________________________________________________________________
Sensitivity (MIN/MAX) 8.0/20.0 6.0/15.0 3.0/6.0 1.5/3.0 mV/g 2
RANGE
______________________________________________________________
PARAMETERS ±50G ±100G ±200G ±500G UNITS NOTES
__________________________________________________________________________________________________________________________________________________
Frequency Response [MIN] 0-1000 0-1500 0-2000 0-2400 Hz 1, 9
__________________________________________________________________________________________________________________________________________________
Mounted Resonant Frequency [MIN] 2000 3000 4000 5000 Hz 8, 9
__________________________________________________________________________________________________________________________________________________
Sensitivity (MIN/MAX) 0.6/1.5 0.3/0.6 0.15/0.3 0.06/0.15 mV/g 2
PARAMETERS MIN TYP MAX UNITS NOTES
__________________________________________________________________________________________________________________________________________________
Zero Acceleration Output 5.0 25.0 ±mV 9
__________________________________________________________________________________________________________________________________________________
Damping Ratio 0.4 0.7 0.9 8, 9
__________________________________________________________________________________________________________________________________________________
Non-linearity 0.5 1.0 ±% Span 4
__________________________________________________________________________________________________________________________________________________
Transverse Sensitivity 1.0 3.0 ±% Span
__________________________________________________________________________________________________________________________________________________
Input & Output Resistance 2.5 3.5 6.5 kΩ9
__________________________________________________________________________________________________________________________________________________
Temperature Error - Span 1.0 2.0 ±% Span 3, 5
__________________________________________________________________________________________________________________________________________________
Temperature Error - Zero 1.0 2.0 ±% Span 3, 5
__________________________________________________________________________________________________________________________________________________
Supply Voltage 5.0 10.0 VDC
__________________________________________________________________________________________________________________________________________________
Output Noise 1.0 µV p-p 6
__________________________________________________________________________________________________________________________________________________
Output Load Resistance 5 MΩ
__________________________________________________________________________________________________________________________________________________
Acceleration Limits (Any Direction) 20X Rated 7
__________________________________________________________________________________________________________________________________________________
Operating Temperature -40°C to +125°C
__________________________________________________________________________________________________________________________________________________
Storage Temperature -55°C to +150°C
__________________________________________________________________________________________________________________________________________________
Weight 6.5 Grams
__________________________________________________________________________________________________________________________________________________
Materials Alumina ceramic substrate with alumina ceramic cap
1. The frequency response is defined as the range of frequencies over
which the device sensitivity is within ±5% of the DC value.
2. Output voltage increases for positive acceleration; output voltage
decreases for negative acceleration.
3. Percentage values are with external compensation. The uncompensated
temperature coefficients are measured and specified with each unit. In
addition, the values of the resistors that provide a temperature
compensated output are provided with each unit. These resistors are
for use in the circuit shown in Figure 2.
4. Best Fit Straight Line. For full scale ranges of 10g or less, the maximum
non-linearity is ±2%.
5. Compensated temperature range: 0-50°C in reference to 25°C.
6. 10 Hz to 1 kHz.
7. 400g for ±2g, ±5g, and ±10g versions. 20X or 2000g for other
versions, whichever is less.
8. For sensors having a resonant frequency greater than 5 kHz, the
calibration data sheet will indicate ">5 kHz." In addition, the damping
ratio will indicate N/A.
9. Actual test data for this parameter is included on the calibration sheet
provided with each sensor. A sample of this calibration sheet is shown
as Figure 1.
Notes
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–Unamplified 2-13
PC Board Mountable Accelerometer
Model 3022
DIMENSIONS
ORDERING INFORMATION
CONNECTIONS
LTR 2 - 10 g 20 - 500 g
“A” DIM 0.300 ± 0.005 0.265 ± 0.005
[7.62 ± 0.13] [6.73 ± 0.13]
“B” DIM 0.250 ± 0.005 0.240 ± 0.005
[6.35 ± 0.13] [6.10 ± 0.13]
“C” DIM 0.032 ± 0.004 0.032 ± 0.004
[0.81 ± 0.10] [0.81 ± 0.10]
Dec 2002
