5B30 / 5B31
GENERAL DESCRIPTION
mode (nosie on signal return) rejection at 50/60 Hz, enabling
accurate measurement of small signals in high electrical noise.
The 5B30 and 5B31 are single-channel signal conditioning
modules that amplify, protect, filter and isolate analog input
voltages.
Signal isolation by transformer coupling uses a proprietary
modulation technique for linear, stable and reliable
The 5B30 and 5B31 protect the computer side from damage due
to field-side over voltage faults. All models withstand 240V rms
at their input terminals without damage thereby shielding
computer side circuitry from field-side over voltage conditions.
In addition, 5B30 and 5B31 Series modules are mix-and-match
and hot swappable, so can be inserted or removed from any
socket in the same backplane without disrupting system power.
performance. The differential input circuit on the field side is
fully floating, eliminating the need for any input grounding. A
demodulator on the computer side of the signal transformer
recovers the original signal, which is then filtered and buffered
to provide a low-noise, low-impedance output signal. The
output common must be kept within +3 V of power common.
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 voltage is subtracted from the input signal to set the
zero scale value. 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 that
the total span for precise expanded-scale measurements.
Internal multi-pole low-pass filtering with a four-Hz cutoff (-
3dB) enhances normal-mode (noise on signal) and common-
.
Figure2
Rev. 0 | Page 2 of 8
ADI [ ADI ]
