Impulse SCM5B43 User Manual

Isolated Analog Signal Conditioning Products

SCM5B43

General Purpose Input Modules, with DC Excitation

Description

Each SCM5B43 general purpose input module provides a single channel of

transducer input which is filtered, isolated, scaled, 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 SCM5B43 can interface to devices which require a precision 10VDC

excitation supply. The 1kHz bandwidth significantly reduces ripple and noise

inherent in these devices.

Transducer excitation is provided from the module by a very stable 10V 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. Eight full scale input ranges are provided, from ±1V to

±10V, producing ±5V full scale output.

The input signal is processed through a pre-amplifier on the field side of the

isolation barrier. This pre-amplifier has a gain-bandwidth product of 5MHz and

is bandwidth limited to 1kHz. After amplification, 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%.

Special input circuits on the SCM5B43 module provide protection of the signal

inputs and the isolated excitation supply up to 240VAC.

SCM5B

▲

Features

 Interfaces to DC Displacement Transducers

and Other Devices Requiring a Stable DC

Supply

 High Level Voltage Outputs

 1500Vrms Transformer Isolation

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 240VAC Continuous

 Fully Isolated Excitation Supply

 100dB CMR

 1kHz Signal Bandwidth

 ±0.03% Accuracy

 ±0.005% Linearity

 ±20µV/°C Drift

 CSA Certified, FM Approved, CE and ATEX

Compliant

 Mix and Match SCM5B Types on Backpanel

Figure 1: SCM5B43 Block Diagram

For information call 800-444-7644

Isolated Analog Signal Conditioning Products

SCM5B

Specifications

Module

Input Range ±1V to ±10V

Input Bias Current ±0.05nA

Input Resistance

Normal 2MΩ (minimum) Power Off 2MΩ (minimum) Overload 2MΩ (minimum)

Input Protection

Continuous 240Vrms max

Transient ANSI/IEEE C37.90.1 (formerly IEEE-472)

Excitation Voltage, V

Excitation Current 40mA (maximum)

Excitation Load Regulation ±5ppm/mA

Excitation Stability ±15ppm/°C

Isolated Excitation Protection

Continuous 240Vrms max

Transient ANSI/IEEE C37.90.1 (formerly IEEE-472)

CMV, Input to Output

Continuous 1500Vrms max

Transient ANSI/IEEE C37.90.1 (formerly IEEE-472)

CMR (50 or 60Hz) 100dB

NMR (3dB at 1kHz) 120dB per Decade Above 1kHz

(1)

Accuracy

Nonlinearity ±0.005% Span

Stability

Input Offset ±20µV/°C

Output Offset ±40µV/°C

Gain ±50ppm/°C

Noise

Input, 0.1 to 10Hz 0.4µVrms

Output, 100kHz 5mVp-p

Bandwidth, 3dB 1kHz

Response Time 750µs

(to 90% final value)

Output Range See Ordering Information

Output Resistance 50Ω

Output Protection Continuous Short to Ground

Output Selection Time 6.0µs at C

(to ±1mV of V

Output Current Limit ±8mA

Output Enable Control

Max Logic 0 +0.8V

Min Logic 1 +2.4V

Max Logic 1 +36V

Input Current 0,1 0.5µA

Power Supply Voltage +5VDC ±5%

Power Supply Current 200mA at Full Exc. Load,

Power Supply Sensitivity ±200µV/% RTI

Mechanical Dimensions 2.28" x 2.26" x 0.60"

(h)(w)(d) (58mm x 57mm x 15mm)

Environmental

Operating Temp. Range 40°C to +85°C

ATEX Group II, Cat. 3 20°C to +40°C

Storage Temp. Range 40°C to +85°C

Relative Humidity 0 to 95% Noncondensing

Emissions EN61000-6-4 ISM, Group 1

Radiated, Conducted Class A

Immunity EN61000-6-2 ISM, Group 1

R F Performance A ±0.5% Span Error

ESD,EFT,Surge,Voltage Dips Performance B

Typical at TA=+25°C and +5V power

EXC

)

OUT

SCM5B43

+10.0VDC ±2mV

±0.03% Span,

= 0 to 2000pF

load

100mA at No Exc. Load

(2)

Ordering Information

Model Maximum Input Output Range

SCM5B43-01 ±1V 1, 2

SCM5B43-02 ±2V 1, 2

SCM5B43-03 ±3V 1, 2

SCM5B43-04 ±4V 1, 2

SCM5B43-05 ±5V 1, 2

SCM5B43-06 ±6V 1, 2

SCM5B43-07 ±7V 1, 2

SCM5B43-08 ±8V 1, 2

SCM5B43-09 ±9V 1, 2

SCM5B43-10 ±10V 1, 2







Output Ranges Available

Output Range Part No. Suffix Example

1. -5V to +5V NONE SCM5B43-01

2. -10V to +10V D SCM5B43-01D

NOTES:

(1) Includes excitation error, nonlinearity, hysteresis and repeatability.

(2) RTI = Referenced to input.



SCM5B

Visit our website www.dataforth.com