5B38

`Wide-bandwidth Single-Channel Signal Conditioning
`Interfaces, Amplifies, and Filters signals from full-bridge and half-bridge strain-gage transduces between 300 and 10k.
`Isolated Precision Output of -5V to +5V.
`10 kHz bandwidth of the 5B38 ideally suits to measure signals that vary rapidly with time.
`Module circuitry can withstand 240v rms at the input screwterminals.
`All 5B38 series modules are mix-and-match and Hot
`Swappable.

The 5B38 is a wide-bandwidth single-channel signal conditioning module that interfaces, amplifies, and filters signals from full-bridge and half-bridge strain-gage transducers between 300 and 10k. The 5B38 provides an isolated bridge excitation of +10V and a protected, isolated precision output of -5V to +5V. The 10 kHz bandwidth of the 5B38 ideally suits to measure signals that vary rapidly with time, such as strain on an automobile chassis during a crash test.

The 5B38 protects the computer side from damage due to fieldside over-voltage faults. The module withstands 240V rms at its input terminals without damage, thereby shielding computerside circuitry from field-side over-voltage conditions. In addition, the 5B38 is mix-and-match and hot-swappable with all 5B Series modules, so can be inserted or removed from any socket in the same backplane without disrupting system power.

The 5B38 contains bridge completion circuitry, so can function with half-bridge strain gages. For quarter-bridge requirements, the user must complete the bridge input to the half-bridge level externally. The factory can configure the module for a wide range of input ranges (sensitivities).A signle-pole anti-aliasing filter resides at each 5B38 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. A chopper-stabilized input amplifier of 5B38 provides low drift and stable gain.

Signal isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance. The differential input circuit of 5B38 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. An additional benefit, the output section acts as a third floating port, eliminating possible problems from ground loops and power-supply noise. The output common of 5B38 must be kept within +3V of power common.

A series output switch of 5B38 eliminates the need for external multiplexing in many applications. The switch is turned on by an active-low enable input. If the switch of 5B38 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..