2-12 Accelerometer – Unamplified
Model 3022
PC Board Mountable Accelerometer
Millivolt Output
Low Cost
Vibration/Shock Monitoring
Modal Analysis
Motion Control
Crash Testing
Aerospace
FEATURES
Adhesive Mount
±0.5% Non-linearity (typical)
±1.0% Temperature Performance
(with comp resistors—typical)
DC Response
Built-in Damping
Built-in Overrange Stops
Low Power
Pins or No Pins
STANDARD RANGES
Range g Range g
±2 ●±50 ●
±5 ●±100 ●
±10 ●±200 ●
±20 ●±500 ●
DESCRIPTION
The Model 3022 is a piezore si st ive silicon ac celerometer. It is
packaged on a ceram ic substrate with an epoxy sealed ceramic
cover and is designed for adhesive mounting. A detailed
cali bra tion sheet provid es test data and re si stor compensation
values for each sen sor.
The acceleromete r consists of a micro machined silicon
mass suspended by multiple beams from a silicon frame.
Piezor e sis to rs loca te d in t he be ams c h ange t h eir resis ta nce a s t he
mo tio n o f the su spend ed ma ss ch an ges th e st ra in in t he be ams.
Sili con caps on the top and bottom of the device are added to
provide ove r-ra ng e stops. This design provides for a ver y low
profile, high shock res istance, durability and built-in damping
over a wide usable bandwidth. E ach sensor is individually
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.
PC Board Mountable Accelerometer Model 3022
Accel erometer – Unamplified 2-13
April 2000
CALIBRATION DATA
Figure 1. Calibration Data Sheet
A calibra tion dat a sheet similar to the sample shown above i s
included with e ach unit. The calibration she et provides the
measured test and calibration data for the sensor. In additi on
to the test data, the values of calibration and temperature
compensation resistors are also incl uded.
SIGNAL CONDITIONING
Figure 2. Typical Temperature Compensation and Amplification Circuit (component values specified for each sensor)
Q1: 2N3904
CR1: 1N914 or equival ent
Op Amps: LT1014, LM324 or equivalent
• Rstc sets the excitation voltage ramp to com pensate the sensitivity
error due to temperature.
• Rset sets the excitation voltage to 5V at 25°C.
• Rzb1, Rzb2 and Rz tc1 and Rztc2 calibr at e the zero offse t and
com p ensate th e offset er ror due t o t emper ature.
• Rs cali bra tes the output span.
• Vcc must be >8 VDC.
Model 3022 PC Board Mountable Accelerometer
2-14 Accelerometer – Unamplified
PERFORMANCE SPECIFICATIONS
Supply Voltage: 5.0 VDC
Ambient Temperature: 25° C (Unless otherwise specified)
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 ">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.
PARAMETERS
RANGE
UNITS NOTES±2G ±5G ±10G ±20G
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
PARAMETERS
RANGE
UNITS NOTES±50G ±100G ±200G ±500G
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 (with pins) 6.5 Grams
Materials Alumina ceramic substrate with alumina ceramic cap
PC Board Mountable Accelerometer Model 3022
Accelerometer – Unamplified
April 2000
DIMENSIONS
ORDERING INFORMATION
CONNECTIONS
LTR 2 - 10 g 20 - 500 g
“A ” D I M 0.300 ± 0.005
[7.62 ± 0.13]
0.265 ± 0.005
[6.73 ± 0.13]
“B” DIM 0.250 ± 0.005
[6.35 ± 0.13]
0.240 ± 0.005
[6.10 ± 0.13]
“C” DIM 0.032 ± 0.004
[0.81 ± 0.10]
0.032 ± 0.004
[0.81 ± 0.10]
LEADER Electronic Co., Ltd - 116, Jianghuali, Jianghua Road, Jiangmen City, GD, PRC
Tel: + 86 750 3101711, 3379183 Fax: + 86 750 3388669 Website: www.leadersensors.com - e-mail: leader@leadersensors.com
