Impulse SCM7B22 - Manual

Isolated Process Control Signal Conditioning Products SCM7B
For information call 800-444-7644 68
SCM7B22
Isolated Bipolar Voltage Output Modules
Figure 1: SCM7B22 Block Diagram
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Features
• Accepts High Level Input to ±10V
• Provides High Level Output to ±10V
• 1500Vrms Transformer Isolation
• Accuracy, ±0.03% of Span Typical,
±0.1% Max
• ANSI/IEEE C37.90.1 Transient Protection
• Output Protected to 120Vrms Continuous
• Input Protected to ±35VDC
• Noise, 2mV Peak (5MHz), 1mV RMS
(100kHz)
• CMRR, 100dB
• 80dB Per Decade of Attenuation
Above 400Hz
• Easy DIN Rail Mounting
• CSA Certified, FM Approved
• CE and ATEX Compliant
Description
SCM7B22 voltage output modules accept input signals in the ±10V range from
the process control system. The signal is isolated, buffered, and filtered to
provide a unity gain field voltage output (Figure 1).
These modules incorporate a five-pole filtering approach to maximize both time
and frequency response by taking advantage of both Thomson (Bessel) and
Butterworth characteristics. One pole of the filter is on the process control system
side of the isolation barrier; four are on the field side.
After the initial process control system-side filtering, the input signal is chopped
by a proprietary chopper circuit and transferred across the transformer isolation
barrier, suppressing transmission of common mode spikes and surges. The
signal is then reconstructed and filtered for field-side output.
Modules accept a wide 19 - 29VDC power supply range (+24VDC nominal).
Their compact packages (2.13"x1.705"x0.605" max) save space and are ideal
for high channel density applications. They are designed for easy DIN rail
mounting using any of the “-DIN” backpanels.