High Performance, Economy Strain Gage/RTD Conditioners
Models 2B30 and 2B31
FEATURES Low Cost Complete Signal Conditioning Function Low Drift: 0.5/C max ("L"); Low Noise: 1V p-p max Wide Gain Range: 1 to 2000V/V Low Nonlinearity: 0.0025% max ("L") High CMR: 140dB min (60Hz, G =1000V/V) Input Protected to 130V rms Adjustable Low Pass Filter: 60dB/Decade Roll-Off (from 2Hz) Programmable Transducer Excitation: Voltage (4V to 15V @ 100mA) or Current (100A to 10mA) APPLICATIONS Measurement and Control of: Pressure, Temperature, Strain/Stress, Force, Torque Instrumentation: Indicators, Recorders, Controllers Data Acquisition Systems Microcomputer Analog I/O
in harsh industrial environments, such characteristics as high CMR, input protection, low noise, and excellent temperature stability make 2B30/2B31 ideally suited for use in indicators, recorders, and controllers. The combination of low cost, small size and high performance of the 2B30/2B31 offers also exceptional quality and value to the data acquisition system designer, allowing him to assign a conditioner to each transducer channel. The advantages of this approach over low level multiplexers include significant improvements in system noise and resolution, and elimination of crosstalk and aliasing errors. DESIGN FEATURES AND USER BENEFITS High Noise Rejection: The true differential input circuitry with high CMR (140dB) eliminating common-mode noise pickup errors, input filtering minimizing RFI/EMI effects, output low pass filtering (fc=2Hz) rejecting 50/60Hz line frequency pickup and series-mode noise. Input and Output Protection: input protected for shorts to power lines (130V rms), output protected for shorts to ground and either supply. Ease of Use: Direct transducer interface with minimum external parts required, convenient offset and span adjustment capability. Programmable Transducer Excitation: User-programmable adjustable excitation source-constant voltage (4V to 15V @ l00mA) or constant current (100A to l0mA) to optimize transducer performance. Adjustable Low Pass Filter: The three-pole active filter (fc=2Hz) reducing noise bandwidth and aliasing errors with provisions for external adjustment of cutoff frequency.
GENERAL DESCRIPTION Models 2B30 and 2B31 are high performance, low cost, com pact signal conditioning modules designed specifically for high accuracy interface to strain gage-type transducers and RTD's (resistance temperature detectors). The 2B31 consists of three basic sections: a high quality instrumentation amplifier; a three-pole low pass filter, and an adjustable transducer excitation. The 2 B30 has the same amplifier and filter as the 2B31, but no excitation capability. Available with low offset drift of 0.5V/C max (RTI, G = 1000V/V) and excellent linearity of 0.0025% max, both models feature guaranteed low noise performance (1V p-p max), and outstanding l40dB common mode rejection (60Hz, CMV = 10V, G = 1000V/V) enabling the 2B30/2B31 to maintain total amplifier errors below 0.1% over a 20C temperature range. The low pass filter offers 60dB/decade roll-off from 2Hz to reduce normal-mode noise bandwidth and improve system signal-to-noise ratio. The 2B31's regulated transducer excitation stage features a low output drift (0.01 5%/C max) and a capability of either constant voltage or constant current operation. Gain, filter cutoff frequency, output offset level and bridge excitation (2B31) are all adjustable, making the 2B30/2B31 the industry's most versatile high-accuracy transducer-interface modules. Both models are offered in three accuracy selections, J/K/L, differing only in maximum nonlinearity and offset drift specifications. APPLICATIONS The 2B30/2B31 may be easily and directly interfaced to a wide variety of transducers for precise measurement and control of pressure, temperature, stress, force and torque. For applications
Information furnished by Intronics is believed to be accurate and reliable. However, no responsibility is assumed by Intronics for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intronics.
1400 Providence Highway, Building #2 Norwood, MA 02062 Phone (781) 551-5500 FAX (781) 551-5555 www.intronicspower.com
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