5B34-C-10-FC

5B34-C-10-FC FEATURES

Amplifies, Protects, Filters, and Isolates Analog Input.Linearize a wide variety of 2 & 3 wire RTDs. (True 4-wire RTDmeasurements are provided by the 5B35).Generates an output of 0 to +5V.Module circuitry can withstand 240v rms at the input screw-terminals.All 5B34 series modules are mix-and-match and Hot

5B34-C-10-FC PRODUCT OVERVIEW

The 5B Series represents an innovative generation of low cost,high performance plug-in signal conditioners. Designed forindustrial applications, these modules incorporate highlyreliable transformer-based isolation and automated surface-mount manufacturing technology. They are compact,economical components whose performance exceeds thatavailable from more expensive devices. Combining 1500 V rmscontinuous isolation, +0.05% calibrated accuracy, small size andlow cost, the 5B Series is an attractive alternative to expensivesignal conditioners and in-house designsAll modules are potted and identical in pin-out and size (2.27” x2.32” x 0.595”). They can be mixed and matched, permittingusers to address their exact needs, and may be “hot swappedwithout disturbing field wiring or power. The isolated inputmodules provide 0 to +5V or +5V outputs and accept J, K, T, E,R, S, N, or B type thermocouples.These modules feature complete signal conditioning functionsincluding 240 V rms input protection, filtering, chopperstabilized low drift +1 uV/oC amplification, 1500 V rmsisolation, and sensor excitation when required.All modules feature excellent common mode rejection andmeet industrial transient surge withstand specifications.

5B34-C-10-FC APPLICATIONS

Industrial signal conditioningIndustrial signal isolationIndustrial signal filtering

5B34-C-10-FC GENERAL DESCRIPTION

The 5B34 is a single-channel signal conditioning module thatamplifies, protects, filters, linearizes, and isolates a wide varietyof two and three-wire RTDs. For true four-wire RTDmeasurements please refer to the 5B35 model.The 5B34 protects the computer side from damage due to field-side over-volatge faults. The module withstands 240 V rms atthe input terminals without damage thereby shielding theinternal computer-side circuitry from field-side over-voltageconditions. In addition, the 5B34 is mix-and-match and hotswappable with all other 5B Series input modules, so can beinserted or removed from any socket in the same backplanewithout disrupting system power.Two identical sources provide excitation current for the RTD.For three-wire RTDs, the second current flows through thethird RDT lead so as to cancel the effects of (equal) leadresistance; this current also flows through a stable resistor laser-trimmed to the RTD value that sets the differential amplifierinput and (module) output to zero volts at that scale point. Thecurrent sources and the amplifier input are protected towithstand input over-voltage up to 240 V rms.A differential chopper-stabilized input amplifier provides stablegain and exceptionally low drift. This allows the use of very lowRTD excitation current to minimize self-heating and preservemeasurement accuracy. Along with module gain and zerosettings, a feedback linearizer is laser-trimmed. Custom versionsof 5N34 can be laser-trimmed to meet special requirements.Internal multi-pole low-pass filtering with a four-Hz cutoff (-3dB) enhances normal-mode (noise on signal) and common-mode (noise on signal return) rejection at 50/60 Hz, enablingaccurate measurement of small signals in high electrical noise.Signal isolation by transformer coupling uses a proprietarymodulation technique for linear, stable and reliableperformance. The differential input circuit on the field side isfully floating, eliminating the need for any input grounding. Ademodulator on the computer side of the signal transformerrecovers the original signal, which is then filtered and bufferedto provide a low-noise, low-impedance output signal. Theoutput common must be kept within +3V of power common.A series output switch eliminates the need for externalmultiplexing in many applications. The switch is turned on byan 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 ison the 5B01 and 5B08 backplanes...

5B34-C-10-FC Description

5B34-C-10-FC GENERAL DESCRIPTION

The 5B34 is a single-channel signal conditioning module thatamplifies, protects, filters, linearizes, and isolates a wide varietyof two and three-wire RTDs. For true four-wire RTDmeasurements please refer to the 5B35 model.The 5B34 protects the computer side from damage due to field-side over-volatge faults. The module withstands 240 V rms atthe input terminals without damage thereby shielding theinternal computer-side circuitry from field-side over-voltageconditions. In addition, the 5B34 is mix-and-match and hotswappable with all other 5B Series input modules, so can beinserted or removed from any socket in the same backplanewithout disrupting system power.Two identical sources provide excitation current for the RTD.For three-wire RTDs, the second current flows through thethird RDT lead so as to cancel the effects of (equal) leadresistance; this current also flows through a stable resistor laser-trimmed to the RTD value that sets the differential amplifierinput and (module) output to zero volts at that scale point. Thecurrent sources and the amplifier input are protected towithstand input over-voltage up to 240 V rms.A differential chopper-stabilized input amplifier provides stablegain and exceptionally low drift. This allows the use of very lowRTD excitation current to minimize self-heating and preservemeasurement accuracy. Along with module gain and zerosettings, a feedback linearizer is laser-trimmed. Custom versionsof 5N34 can be laser-trimmed to meet special requirements.Internal multi-pole low-pass filtering with a four-Hz cutoff (-3dB) enhances normal-mode (noise on signal) and common-mode (noise on signal return) rejection at 50/60 Hz, enablingaccurate measurement of small signals in high electrical noise.Signal isolation by transformer coupling uses a proprietarymodulation technique for linear, stable and reliableperformance. The differential input circuit on the field side isfully floating, eliminating the need for any input grounding. Ademodulator on the computer side of the signal transformerrecovers the original signal, which is then filtered and bufferedto provide a low-noise, low-impedance output signal. Theoutput common must be kept within +3V of power common.A series output switch eliminates the need for externalmultiplexing in many applications. The switch is turned on byan 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 ison the 5B01 and 5B08 backplanes...Figure 2