5B41

The 5B40 and 5B41 are wide-bandwidth single-channel signal conditioning modules that amplify, protect, filter and isolate analog input voltages. Both 5B40 and 5B41 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 of 5B40 and 5B41 provides low drift and stable gain. At the amplifier input, a stable, laser-trimmed zeroscale input offset is subtracted from the input signal to set the zero-scale value. For user convenience, the zero of 5B40 and 5B41 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 of 5B40 and 5B41 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 of 5B40 and 5B41 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 of 5B40 and 5B41 must be kept within 3Vdc of power common.

A series output switch of 5B40 and 5B41 eliminates the need for external multiplexing in many applications. The switch is turned on by an active-low enable input. If the switch of 5B40 and 5B41 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.