SCM5B38-33

Isolated Analog Signal Conditioning Products S C M 5 B SCM5B38 Strain Gage Input Modules, Narrow Bandwidth Description Each SCM5B38 Strain Gage input module provides a single channel of strain gage input which is filtered, isolated, amplified, and converted to a high-level analog voltage output (Figure 1). This voltage output is logic switch controlled, which allows these modules to share a common analog bus without the re uirement of external multiplexers. Features • The SCM5B modules are designed with a completely isolated computer side circuit which can be oated to from Power ommon, pin . This complete isolation means that no connection is re uired between I O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin , the Read nable pin, to I O ommon, pin . • • • • • The S B can interface to full bridge or half bridge transducers with a nominal resistance of to . A matched pair of bridge completion resistors (to ± 1mV at +10V excitation) allows use of low cost half bridge or uarter bridge transducers Figures , , . Strain gage excitation is provided from the module by a very stable or 3.333V source. The excitation supply is fully isolated, allowing the amplifier inputs to operate over the full range of the excitation voltage. This feature offers significant exibility in real world applications. Full scale sensitivities of 2mV/V, 3mV/V or 10mV/V are offered as standard. With 10V excitation, this results in ± 20mV, ± 30mV or ± 100mV full scale input range producing ± 5V full scale output. After initial field side filtering the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ± 5%. F i g u r e 1 : S C M 5 B 3 8 B l o ck • • • • • • Interfaces to Thru , Full Bridge, Half-Bridge, or Quarter-Bridge Strain Gages High-Level Voltage Output 1500Vrms Transformer Isolation ANSI/IEEE C37.90.1 Transient Protection Input Protected to 240VAC Continuous Fully Isolated Excitation Supply 160dB CMR 95dB NMR at 60Hz, 90dB at 50Hz 4Hz Signal Bandwidth ± 0.03% Accuracy ± 0.01% Linearity Drift SA S ertified CE and ATEX Compliant Mix and Match SCM5B Types on Backpanel Special input circuits on the SCM5B38 module provide protection of the signal inputs and the isolated excitation supply up to 240VAC. D ia g r a m 2 0 ©1995-2017 Dataforth Corporation, All Rights Reserved For information call 800-444-7644 ISO9001:2008-Registered QMS Specifications Typical❇ at TA Module Input Range Input Bias Current Input Resistance Normal Power Off Overload Signal Input Protection Continuous Transient Excitation Output (-32, -34, -35, -37) Load Resistance Excitation Output (-31, -33, -36) Load Resistance Excitation Load Regulation xcitation Stability Half Bridge Voltage Level (-34) Half Bridge Voltage Level (-33) Isolated Excitation Protection Continuous Transient CMV, Input to Output Continuous Transient CMR (50 or 60Hz) NMR Accuracy(2) Linearity Stability Input Offset Output Offset Gain Noise Input, 0.1 to 10Hz Output, 100kHz Bandwidth, – 3dB Response Time, 90% Span and Ordering Information D power Full Bridge SCM5B38-31,-32,-35,-36,-37 Half Bridge SCM5B38-33,-34 ± 10mV to ± 100mV ± 0.5nA * * * * 240Vrms max ANSI/IEEE C37.90.1 * * * * Input Range – 10mV to +10mV – 30mV to +30mV – 10mV to +10mV – 30mV to +30mV – 20mV to +20mV – 33.3mV to +33.3mV – 100mV to +100mV citation +3.333V +10.0V +3.333V +10.0V +10.0V +3.333V +10.0V Output Sens. Range† 3mV/V 1, 2 3mV/V 1, 2 3mV/V 1, 2 3mV/V 1, 2 2mV/V 1, 2 10mV/V 1, 2 10mV/V 1, 2 Output Ranges Available * * Output Range Part o u fi * +5V ± 1mV +1.667V ± 1mV 240Vrms max ANSI/IEEE C37.90.1 * 1500Vrms max ANSI/IEEE C37.90.1 160dB 95dB at 60Hz, 90dB at 50Hz * 1. – 5V to +5V 2. – 10V to +10V NONE D am e SCM5B38-31 SCM5B38-31D * * * * ± 0.03% Span ± 0.01% Span * * * * ppm of Reading . * rms rms rms 4Hz 0.2s * F i g u r e 2 : F u l l B r i d g e C o n n e ct i o n * * See Ordering Information * Continuous Short to Ground s at load = 0 to 2000pF * ± 8mA * Output nable ontrol Max Logic “0” Min Logic “1” Max Logic “1” Input Current “0,1” +0.8V +2.4V +36V . A * Power Supply Sensitivity +5VDC ± 5% 170mA Full Exc. Load, 70mA No Exc. Load RTI(3) Mechanical Dimensions (h)(w)(d) 2.28” x 2.26” x 0.60” (58mm x 57mm x 15mm) Environmental Operating Temperature Range Storage Temperature Range Relative Humidity Emissions EN61000-6-4 Radiated, Conducted Immunity EN61000-6-2 RF ESD, EFT Type Bridge Input Full Full Half Half Full Full Full † * Output Range Output Resistance Output Protection Output Selection Time (to ± 1mV of VOUT) Output Current Limit Power Supply Voltage Power Supply Current Model SCM5B38-31 SCM5B38-32 SCM5B38-33 SCM5B38-34 SCM5B38-35 SCM5B38-36 SCM5B38-37 * +10V ± 3mV to +3.333V ± 2mV to ± 5ppm/mA ppm NA NA S C M 5 B to to 0 to 95% Noncondensing ISM, Group 1 Class A ISM, Group 1 Performance A ± 0.5% Span Error Performance B NOTES: ❇ ontact factory or your local Dataforth sales office for maximum values. * Same as -31, -32, -35, -36, -37 modules. (1) Strain element. Includes linearity, hysteresis and repeatability. (3) RTI = Referenced to input. * * * * * * * * F i g u r e 3 : H a l f B r i d g e C o n n e ct i o n * * * * * * * * * F i g u r e 4 : Q u a r t e r B r i d g e C o n n e ct i o n Visit our website www.dataforth.com ©1995-2017 Dataforth Corporation, All Rights Reserved 2 1 ISO9001:2008-Registered QMS S C M 5 B Isolated Analog Signal Conditioning Products