5B40

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 of 5B40 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 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 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 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 must be kept within 3Vdc of power common.

A series output switch of 5B40 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 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.