5B40 & 5B41

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GENERAL DESCRIPTION

The 5B40 and 5B41 are wide-bandwidth single-channel signal

conditioning modules that amplify, protect, filter and isolate

analog input voltages. Both modules provide a 10 kHz

bandwidth which ideally suits them to measuring signals that

vary rapidly with time. Examples include pressure inside a

plastic injection molding machine, strain on an automobile

chassis during a crash test and vibrations on a machine bearing

shortly before failure.

The 5B40 and 5B41 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, 5B40 and 5B41 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.

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 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.

A single-pole anti-aliasing filter resides at each modules input.

A three-pole, low-pass filter in the output stage sets the

bandwidth and yields optimal noise performance for accurate

measurement of small signals in high electrical noise.

Signal isolation by transformer coupling uses a proprietary

modulation technique for linear, stable and reliable

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 3Vdc 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.

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Figure 2