2-32 accelerometer ? amplified model 3140 signal conditioned accelerometer 0.5 to 4.5 vdc output intergral temperature compensation high performance vibration/shock testing geophysical monitoring modal analysis structural analysis elevator ride control 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 description the model 3140 is a high performance accelerometer intended for instrumentation applications. the 3140 provides a fully sig- nal 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 light- weight valox? housing that can be easily attached to a mount- ing surface. the sensing element is a micro machined silicon mass sus- pended 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. a lower cost version of the 3140 is available for applica- tions that do not require the temperature performance offered with the 3140. please refer to the model 3145 for additional information. dimensions
signal conditioned accelerometer model 3140 accelerometer ? amplified 2-33 june 2001 performance specifications supply current: 12 vdc ambient temperature: 25c (unless otherwise specified) notes 1. the output voltage increases from the zero acceleration output for positive acceleration 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: -20c to +85c in reference to 25c. 5. pin 2 provides an optional 2.5v reference which may be used, if desired, to provide 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 regulator, 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 proper 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. ordering information connections parameters range 2g 5g 10g 20g 50g 100g frequency response [min] see notes 2, 8 0-200 0-300 0-400 0-500 0-600 0-1500 mounted resonant frequency [min] see note 2 450 600 950 1500 2750 3000 sensitivity (nominal) 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 (-20c to +85c) 1.0 2.0 % span 2, 4 temperature error - zero (-20c to +85c) 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 ? output noise 0.5 mv p-p 6 output load resistance 5 k ? acceleration limits 20x rated operating temperature -20c to +85c storage temperature -40c to +125c weight (including cable) 13 grams 3140 - 002 acceleration range model feel free to contact customer service with any questions at toll free 1(800)745-8008; phone (757)766-1500; fax (757)766-4297
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