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5B37-S-05 Datasheet(PDF) 2 Page - Analog Devices |
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5B37-S-05 Datasheet(HTML) 2 Page - Analog Devices |
2 / 8 page 5B37 Rev. 0 | Page 2 of 8 GENERAL DESCRIPTION The 5B37 is a single-channel signal conditioning module that interfaces, amplifies and filters J, K, T, E, R, S, B, N, and C-type thermocouple and provides an isolated and protected precision output of 0 to +5V. Accurate and System-Ready – Internal cold-junction compensation largely corrects errors arising from parasitic thermocouples formed by thermocouple connection to the input screw terminals, providing an accuracy of +0.25oC @ +25oC ambient temperature. The module generates a predictable upscale signal to indicate an open thermocouple, for a downscale response, connect a 47MΩ, 0.25 W resistor across screw terminals 1 and 3. The 5B37 protects 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. Further, the 5B37 is mix-and-match and hot-swappable with other 5B Series modules, 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 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. Internal multi-pole low-pass filtering with a four Hz cutoff (-3 dB) provides 60 dB of normal-mode rejection (noise on signal) and enhancement of common-mode rejection (noise on signal return) at 60 Hz, enabling 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 V 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.. . . Figure 2 |
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