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SCM5B38N

Strain Gage Input Signal Conditioners, Narrow Bandwidth 4 kHz

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. 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 ± 50 V 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 Ω to 10 kΩ. A matched pair of bridge-completion resistors (to ± 1 mV at + 10 V excitation) allows use of low cost half-bridge or quarter-bridge transducers.

Strain gage excitation is provided from the module by a very stable 10 V or 3.333 V 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 2 mV/V, 3 mV/V or 10 mV/V are offered as standard. With 10 V excitation, this results in ± 20 mV, ± 30 mV or ± 100 mV full scale input range producing ± 5 V 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 + 5 VDC, ± 5%.

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

Circuit diagram Dataforth SCM5B38N

Block Diagram SCM5B38N



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7 Modules for Type SCM5B38N:

ModuleInputDescription
SCM5B38-37 -100 to +100 mV, 10 V Sens. SCM5B38 Isolated Strain Gage Input Module, Narrow Bandwidth with Voltage-Output
SCM5B38-36 -33,3 to +33,3 mV, 3,33 mV Sens. SCM5B38 Isolated Strain Gage Input Module, Narrow Bandwidth with Voltage-Output
SCM5B38-35 -20 to +20 mV, 10 V Sens. SCM5B38 Isolated Strain Gage Input Module, Narrow Bandwidth with Voltage-Output
SCM5B38-34 -30 to +30 mV, 10 V Sens. SCM5B38 Isolated Strain Gage Input Module, Narrow Bandwidth with Voltage-Output
SCM5B38-33 -10 to +10 mV, 3,33 mV Sens. SCM5B38 Isolated Strain Gage Input Module, Narrow Bandwidth with Voltage-Output
SCM5B38-32 -30 to +30 mV, 10 V Sens. SCM5B38 Isolated Strain Gage Input Module, Narrow Bandwidth with Voltage-Output
SCM5B38-31 -10 to +10 mV, 3,33 mV Sens. SCM5B38 Isolated Strain Gage Input Module, Narrow Bandwidth with Voltage-Output

Specifications

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  • Input: Full-, Half- und Quarter-Bridges DMS
  • Output: ± 5 V or ± 10 V
  • Bandwidth 4 Hz
  • Isolation 1500 Vrms
  • Input protection 240 Vrms
  • Input Resistance 50 MOhm
  • Accuracy ± 0.03%
  • Linearity ± 0.01%
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 160dB
  • True 3-way isolation
  • NMR: 95/90dB at 60/50Hz
  • Power Supply +5 VDC
  • Operating Temperature Range -40°C … +85°C
  • Mix and Match Types on Backpanels possible
  • Dimensions 58 x 57 x 15 mm
  • Optional DIN Rail Mounting
  • CSA certified, CE and ATEX compliant
  • Wide range of accessories
  • Special Solutions on request