Model 3140 � Vibration/Shock Testing Signal Conditioned Accelerometer � Geophysical Monitoring 0.5 to 4.5 VDC Output � Modal Analysis Intergral Temperature Compensation � Structural Analysis High Performance � Elevator Ride Control 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 FEATURES shock resistance, durability and built-in damping over a wide � Bolt Mount usable bandwidth. A lower cost version of the 3140 is available for applica- � ±0.5% Non-linearity (typical) tions that do not require the temperature performance offered � ±2.0% Temperature Performance with the 3140. Please refer to the Model 3145 for additional � DC Response information. � Built-in Damping DIMENSIONS � Built-in Overrange Stops � Low Power STANDARD RANGES Range g ±2 ● ±5 ● ±10 ● ±20 ● ±50 ● ±100 ● 2-32 Accelerometer – Amplified Signal Conditioned Accelerometer Model 3140 PERFORMANCE SPECIFICATIONS Supply Current: 12 VDC Ambient Temperature: 25°C (Unless otherwise specified) RANGE PARAMETERS ±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 (-20°C to +85°C) 1.0 2.0 ±% Span 2, 4 Temperature Error - Zero (-20°C 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 Notes 1. The output voltage increases from the Zero Acceleration Output for output signal is preferred (0.5-4.5 VDC), make no connection to Pin 2. positive acceleration and decreases for negative acceleration. The To avoid damage to the internal voltage regulator, do not connect Pin 2 sensitivity is then 2V/Range. For example, the ±5g range has a to Pin 1 (gnd). Minimum load resistance connected to Pin 2 without sensitivity of 2V/5g or 400mV/g. affecting output is 100 kΩ. 2. Actual test data for this parameter is included on the calibration sheet 6. 10 Hz to 1 kHz. provided with each sensor. 7. To use an alternate electrical connector, refer to the following color code 3. Includes repeatability, hysteresis, and linearity (best fit straight line). for proper electrical connections: Pin 1 - Green; Pin 2 - Yellow; Pin 3 - Red; Pin 4 - Blue; Pin 5 - Shield. Note: Removing the connector 4. Compensated temperature range: -20°C to +85°C in reference to 25°C. voids the product warranty. 5. Pin 2 provides an optional 2.5V reference which may be used, if desired, 8. The useful frequency range is defined as the range of frequencies over to provide a stable zero-g reference. Thus, the full scale differential which the device sensitivity is within ±5% of the DC value. output between Pin 2 and Pin 4 would be ± 2 VDC. If a single ended ORDERING INFORMATION CONNECTIONS 3140 - 002 Acceleration Range Model June 2001 Feel free to contact customer service with any questions at Accelerometer – Amplified 2-33 Toll free 1(800)745-8008; Phone (757)766-1500; Fax (757)766-4297