5B32
GENERAL DESCRIPTION
zero-scale value for the 4-20 mA range. For user convenience,
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).
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.
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 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..
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
.
.
Figure 2
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