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Isolated Analog Signal Conditioning Products

SCM5B

SCM5B38
Description

Strain Gage Input Modules, Narrow Bandwidth
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 requirement of external multiplexers. The SCM5B modules are designed with a completely isolated computer side circuit which can be floated to ±50V from Power Common, pin 16. This complete isolation means that no connection is required 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 22, the Read-Enable pin, to I/O Common, pin 19. The SCM5B38 can interface to full-bridge or half-bridge transducers with a nominal resistance of 100 to 10k. A matched pair of bridge-completion resistors (to ±1mV at +10V excitation) allows use of low cost half-bridge or quarter-bridge transducers (Figures 2, 3, 4). Strain Gage excitation is provided from the module by a very stable 10V 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 flexibility 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%.

Features

Special input circuits on the SCM5B38 module provide protection of the signal inputs and the isolated excitation supply up to 240VAC.

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Interfaces to 100 Thru 10k, 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 4Hz Signal Bandwidth ±0.03% Accuracy ±0.01% Linearity ±1µV/°C Drift CSA Certified, FM Approved, CE and ATEX Compliant Mix and Match SCM5B Types on Backpanel

Figure 1: SCM5B38 Block Diagram

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For information call 800-444-7644


Isolated Analog Signal Conditioning Products
Specifications
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 Excitation 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) Nonlinearity Stability Input Offset Output Offset Gain Noise Input, 0.1 to 10Hz Output, 100kHz Bandwidth, 3dB Response Time, 90% Span Output Output Output Output (to Output Range Resistance Protection Selection Time ±1mV of VOUT) Current Limit
Typical at TA=+25°C and +5V power

SCM5B
SCM5B

Ordering Information
Half Bridge SCM5B38-33,-34
* * * * * * * * * * * * * +5V ±1mV +1.667V ±1mV * * * * * * * * * * * 1µVrms * * * * * * * * * * * * * * * *


Full Bridge SCM5B38-31,-32,-35,-36,-37
±10mV to ±100mV ±0.5nA 50M 40k 40k 240Vrms max ANSI/IEEE C37.90.1 +10V ±3mV 300 to 10k +3.333V ±2mV 100 to 10k ±5ppm/mA ±15ppm/°C NA NA 240Vrms max ANSI/IEEE C37.90.1 1500Vrms max ANSI/IEEE C37.90.1 160dB 95dB at 60Hz, 90dB at 50Hz ±0.03% Span ±0.01% Span ±1µV/°C ±20µV/°C ±25ppm of Reading/°C 0.2µVrms 200µVrms 4Hz 0.2s See Ordering Information 50 Continuous Short to Ground 6µs at Cload = 0 to 2000pF ±8mA +0.8V +2.4V +36V 0.5µA +5VDC ±5% 170mA Full Exc. Load, 70mA No Exc. Load ±2µV/% RTI(3) 2.28" x 2.26" x 0.60" (58mm x 57mm x 15mm) 40°C to +85°C 20°C to +40°C 40°C to +85°C 0 to 95% Noncondensing ISM, Group 1 Class A ISM, Group 1 Performance A ±0.5% Span Error Performance B

Model
SCM5B38-31 SCM5B38-32 SCM5B38-33 SCM5B38-34 SCM5B38-35 SCM5B38-36 SCM5B38-37

Input Bridge Type

Input Range
+10mV +30mV +10mV +30mV +20mV +33.3mV +100mV

Output Excitation Sens. Range
+3.333V +10.0V +3.333V +10.0V +10.0V +3.333V +10.0V
3mV/V 3mV/V 3mV/V 3mV/V 2mV/V 10mV/V 10mV/V

Full -10mV to -30mV to Full -10mV to Half -30mV to Half -20mV to Full Full -33.3mV to Full -100mV to

1, 1, 1, 1, 1, 1, 1,

2 2 2 2 2 2 2

Output Ranges Available Output Range 1. -5V to +5V 2. -10V to +10V Part No. Suffix NONE D Example SCM5B38-31 SCM5B38-31D

Figure 2: Full Bridge Connection

Output Enable Control Max Logic 0 Min Logic 1 Max Logic 1 Input Current 0,1 Power Supply Voltage Power Supply Current Power Supply Sensitivity Mechanical Dimensions (h)(w)(d) Environmental Operating Temperature Range ATEX Group II, Category 3 Storage Temperature Range Relative Humidity Emissions EN61000-6-4 Radiated, Conducted Immunity EN61000-6-2 RF ESD, EFT, Surge, Voltage Dips

Figure 3: Half Bridge Connection

NOTES: * Same as -31, -32, -35, -36, -37 modules.

(1) Strain element. (2) Includes nonlinearity, hysteresis and repeatability. (3) Referenced to input.

* * * * * * * * *

Figure 4: Quarter Bridge Connection

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