5B36 ISOLATED, POTENTIOMETER INPUT

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Functional Description

5B36-03 The 5B36 is a single-channel signal conditioning module that amplifies, isolates, filters, buffers a wide variety of three-wire potentiometers and two-wire rheostats (slidewires). The module provides an accurately scaled, low-noise low-impedance output of 0 to +5 V.

Accurate and Stable Performance
The 5B36 supplies protected potentiometer/slidewire excitation from a pair of closely matched precision current sources designed to cancel errors due to lead resistances.

A low-drift chopper-stabilized differential amplifier allows use of a very low excitation current to minimize error due to potentiometer self-heating. The amplifiers low input offset drift (±0.004 Ω/°C) and gain drift of 30 ppm/°C assure accuracy over the full operating temperature range.

True Three-Port Isolation
The floating, differential input circuit on the field side eliminates the need for any input grounding. Signal and power isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance. 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. True three-port isolation (Input-Output-Power) includes common-mode ratings of : 1500 V rms between input-output and input-power; 250 V rms between power and output - no return path is required between the power and signal output commons.

Filtering and Protection
An optimized five-pole Butterworth filter (with a 4-Hz bandwidth) provides 116 dB of normal-mode rejection (noise on signal) at 60 Hz and 108 dB at 50 Hz. Output noise is an exceptionally low 0.3 mV pk-pk in a 100 kHz bandwidth and 6 mV pk-pk in a 5 MHz bandwidth.

The 5B36 protects the computer side from damage due to field-side overvoltage faults. The module withstands 240 V rms at the input terminals without damage, thereby shielding the internal computer-side circuitry from field-side overvoltage conditions. In addition, the 5B36 is mix-and-match and hot swappable with all other 5B Series modules, so can be inserted or removed from any socket in the same backplane without disrupting system power.

Convenience Features
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 output common as it is on the 5B01 and 5B08 backplanes.


Figure 1. 5B36 Functional Block Diagram

 

Input Types

Potentiometers/
Slidewires to 10kΩ

Output Range

0 to +5 V

   
5B36IFC
Figure 2. 5B36 Input Field Connections

5B36 Models Available

  Model Input Range Output Range
Order Now5B36-010 Ω to 100 Ω0 V to +5 V
Order Now5B36-020 Ω to 500 Ω0 V to +5 V
Order Now5B36-030 Ω to 1 kΩ0 V to +5 V
Order Now5B36-040 Ω to 10 kΩ0 V to +5 V
 5B36-Custom**
* Custom Input/Output ranges are available. Refer to configuration guide.
5B36 Specifications
(typical @ +25°C and Vs = +5 V dc)

Description Model 5B36
Input Ranges
Standard Ranges0 Ω to 10 kΩ (Refer to Model Table)
Custom Ranges0 Ω to 10 kΩ (Refer to Ordering Section)
Output Range (RL > 50 kΩ)0 V to +5 V
Accuracy1
Initial @ +25°C±0.08% Span
Input Offset vs. Temperature
   100 Ω, 500 Ω, 1 kΩ Sensors±0.004 Ω/°C
   10 kΩ Sensor±0.01 Ω/°C
Output Offset vs. Temperature±20 µV/°C
Gain vs. Temperature±0.003% of Reading/°C
Input Resistance
Power On> 1000 MΩ
Power Off200 kΩ
Overload200 kΩ
Noise
Input, 0.1 Hz to 10 Hz Bandwidth0.2 µV rms
Output, 100 kHz Bandwidth100 µV rms (0.3 mV peak-peak)
Output, 1 MHz Bandwidth1.5 mV peak-peak
Output, 5 MHz Bandwidth6 mV peak-peak
Bandwidth, -3 dB4 Hz
Output Rise Time, 10% to 90% Span100 ms
Common-Mode Voltage (CMV)
Input-to-Output, Continuous1500 V rms, maximum
Input-to-Power, Continuous1500 V rms, maximum
Output-to-Power, Continuous2250 V rms, maximum
TransientANSI/IEEE C37.90.1-1989
Common Mode Rejection (CMR)
1 kΩ Source Imbalance, 50/60 Hz170 dB
Normal Mode Rejection (NMR)116 dB @ 60 Hz; 108 dB @ 50 Hz
Sensor Excitation Current
100 Ω, 500 Ω, 1 kΩ Sensors0.25 mA
10 kΩ Sensor0.1 mA
Lead Resistance Effect
100 Ω, 500 Ω, 1 kΩ Sensors±0.005 Ω/Ω
10 kΩ Sensor±0.01 Ω/Ω
Input Protection
Continuous240 V rms, maximum
TransientANSI/IEEE C37.90.1-1989
Output Resistance25 Ω
Voltage Output ProtectionContinuous Short to Ground
Output Current Limit±9 mA
Output Selection Time6 µs to ±1 mV of Vout @ Cload = 0 to 2,000 pF
Output Enable Control2
Max Logic "0"+0.8 V
Min Logic "1"+2.4 V
Max Logic "1"+100 V
Input Current "0", "1"0.5 µA
Power Supply Voltage+5 V dc ±5%
Power Supply Current15 mA
Power Supply Sensitivity, RTI±2 µV/% of Vs
Mechanical Dimensions2.275" x 2.375" x 0.595"
(57.8 mm x 59.1 mm x 15.1 mm)
Environmental
Temperature Range
   Rated Performance-40°C to +85°C
   Operating-40°C to +85°C
   Storage-40°C to +85°C
Relative Humidity0 to 93% @ +40°C noncondensing
RFI Susceptibility±0.5% Span error @ 400 MHz, 5 Watt, 3 ft

* ±0.025 Ω For Cu RTD's; ±0.1 Ω For Ni RTD's.
1Includes the combined effects of repeatability, hysteresis, and nonlinearity error. Loads heavier than 50 kΩ will degrade nonlinearity and gain temperature coefficient.
2The user's board layout must separate Power Common from Output Common. When the output switch is not used, connect the Enable Input to the Output Common. Output Common is connected to power common when the 5B36 is installed on a 5B Series backplane.
Specifications subject to change without notice.

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