5B40/5B41 Isolated, Wide Bandwidth Millivolt and Voltage Input
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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 overvoltage faults. All models withstand 240 V rms at their input terminals without damage thereby shielding computer-side circuitry from field-side overvoltage 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.
Inside 5B40/5B41 Modules
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 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 3 Vdc 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. The enable input should be grounded to power common if the output need not be switched.
Input and Output Ranges
Figure 1. 5B40 and 5B41 Functional Block Diagram
Figure 2. 5B40 and 5B41 Input Field Connections
5B40 mV Input:
±10 mV to ±100 mV
(±5 mV to ±500 mV custom)
-5 V to +5 V or 0 to +5 V
5B41 V Input:
±1 V to ±20 V
(±0.5 V to ±20 V custom)
2.275" x 2.375" x 0.595"
(57.8 mm x 59.1 mm x 15.1 mm)
-25°C to +85°C
-40°C to +85°C
-40°C to +85°C
0 to 93% @ +40°C noncondensing
±0.5% Span error @ 400 MHz, 5 Watt, 3 ft
* Specifications same as model 5B40. 1 Vz is the nominal input voltage that results in a 0 V output. 2 Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes RL > 50 kΩ. Loads heavier than 50 kΩ will degrade nonlinearity and gain temperature coefficient. 3 The output common must be kept within ±3 V of power common.