5B32

Rev. 0 | Page 2 of 8

GENERAL DESCRIPTION

The 5B32 is a single-channel signal conditioning module that

amplifies, protects, filters and isolates its analog input. The

module measures a process current input signal of 4-20 mA or

0-20 mA by reading the voltage across an external precision

20W resistor (supplied) and generating an output of 0 to +5 V.

Extra current conversion resistor are available as accessories

(See Model AC1362 in the Accessories section).

Note that the 5B32 module circuitry can withstand 240 V rms at

the input screw-terminals, thereby shielding computer-side

circuitry from field-side overvoltage conditions. In addition, all

5B32 Series modules are mix-and-match and hot swappable, so

can be inserted or removed from any socket in the same

backplane without powering down the system.

A chopper-stabilized input amplifier provides low drift and

stable gain. At the amplifier input, a stable, laser-trimmed zero-

scale input offset is subtracted from the input signal to set the

zero-scale value for the 4-20 mA range. For user convenience,

the zero can be optionally factory-set to meet custom needs,

This allows suppression of a zero-scale input value many times

larger than the total span for precise expanded-scale

measurements.

Internal multi-pole lowpass filtering with a four-Hz cutoff (-

3dB) enhances normal-mode (noise on signal) and common-

mode (noise on signal return) rejection at 50/60 Hz, enabling

accurate measurement of small signals in high electrical noise.

A series output switch eliminates the need for external

multiplexing in many applications. The switch is turned on by

an active-low enable input. If the switch is to be on at all times,

the enable-input should be grounded to power common as it is

on the 5B01 and 5B08 backplanes..

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Figure 2