Model 3028
• Vibration/Shock Monitoring
PC Board Mountable Accelerometer
Millivolt Output
Low Cost
• Modal Analysis
• Motion Control
• Crash Testing
• Aerospace
DESCRIPTION
The Model 3028 is a piezoresistive silicon accelerometer. It is
packaged on a ceramic substrate with a metal bracket which
can be used to bolt the sensor to the mounting location. A
detailed calibration sheet provides test data and resistor com-
pensation 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 an adhesive mount design, see
the Model 3022. Please refer to the Models 3052 and 3058 for
accelerometers with integral temperature compensation.
Accelerometers
FEATURES
•
Bolt Mount
•
±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
±2
±5
±10
±20
g
Range
±50
±100
±200
±500
g
•
•
•
•
•
•
•
•
I n t e r n e t : w w w. m s i u s a . c o m
Te l : 1 - 7 5 7 - 7 6 6 - 1 5 0 0
N o r t h A m e r i c a To l l F r e e : 1 - 8 0 0 - 7 4 5 - 8 0 0 8
Fax: 1-757-766-4297
2-14
Accelerometer Selection Guide–
Unamplified
PC Board Mountable Accelerometer
Model 3028
CALIBRATION DATA
Figure 1. Calibration Data Sheet
A calibration 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.
SIGNAL CONDITIONING
Figure 2. Typical Temperature Compensation and Amplification Circuit (component values specified for each sensor)
Q1: 2N3904
CR1: 1N914 or equivalent
Op Amps: LT1014, LM324 or equivalent
• 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.
Dec 2002
Accelerometer Selection Guide–
Unamplified
2-15
Accelerometers
PC Board Mountable Accelerometer
Model 3028
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
kΩ
9
__________________________________________________________________________________________________________________________________________________
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 (with pins)
8.0 Grams
__________________________________________________________________________________________________________________________________________________
Materials
Alumina ceramic substrate with alumina ceramic cap and aluminum base plate
__________________________________________________________________________________________________________________________________________________
Mounting/Torque
Two slotted holes for 4-40 screws/6 in - lbs. torque
Accelerometers
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. 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 "> 5kHz." 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.
I n t e r n e t : w w w. m s i u s a . c o m
Te l : 1 - 7 5 7 - 7 6 6 - 1 5 0 0
N o r t h A m e r i c a To l l F r e e : 1 - 8 0 0 - 7 4 5 - 8 0 0 8
Fax: 1-757-766-4297
2-16
Accelerometer Selection Guide–
Unamplified
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