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 DESCRIPTION The Model 3140 is a high performance accelerometer intended for instrumentation applications. The 3140 provides a fully signal 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 lightweight Valox™ housing that can be easily attached to a mounting surface. The sensing element is 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 overrange stops. This design provides for a very low profile, high FEATURES shock resistance, durability and built-in damping over a wide Bolt Mount ±0.5% Non-linearity (typical) ±2.0% Temperature Performance DC Response Built-in Damping Built-in Overrange Stops Low Power usable bandwidth. A lower cost version of the 3140 is available for applications that do not require the temperature performance offered with the 3140. Please refer to the Model 3145 for additional information. DIMENSIONS STANDARD RANGES 2-32 Range g ±2 ● ±5 ● ±10 ● ±20 ● ±50 ● ±100 ● Accelerometer – Amplified Model 3140 Signal Conditioned Accelerometer PERFORMANCE SPECIFICATIONS Supply Current: 12 VDC Ambient Temperature: 25°C (Unless otherwise specified) RANGE PARAMETERS Frequency Response [MIN] See notes 2, 8 Mounted Resonant Frequency [MIN] See note 2 Sensitivity (Nominal) ±2G ±5G ±10G ±20G ±50G ±100G 0-200 0-300 0-400 0-500 0-600 0-1500 450 600 950 1500 2750 3000 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 12.0 30.0 Volts Supply Voltage 8.0 Supply Current 5.0 mA Reference Voltage 2.5 Volts Output Resistance 0.1 Ω 0.5 mV p-p Output Noise Output Load Resistance Operating Temperature 20X -40°C to +125°C Weight (Including Cable) 13 Grams 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. 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: -20°C to +85°C in reference to 25°C. 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 ORDERING INFORMATION Rated -20°C to +85°C Storage Temperature 2. 6 kΩ 5 Acceleration Limits 5 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 kΩ. 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. CONNECTIONS 3140 - 002 Acceleration Range Model June 2001 Accelerometer – Amplified Feel free to contact customer service with any questions at Toll free 1(800)745-8008; Phone (757)766-1500; Fax (757)766-4297 2-33