5B32 Isolated Current Input
5B32 Isolated Current Input

Note that the 5B32 module circuitry can withstand 240 V rms at the input screw-terminals, thereby shielding computer-side circuitry from field-side overvoltage conditions. In addition, all 5B32 Series modules are mix-and-match and hot swappable, so can be inserted or removed from any socket in the same backplane without powering down the system.
Inside the 5B32 Series Module
A chopper-stabilized input amplifier provides low drift and stable gain. At the amplifier input, a stable, laser-trimmed zero-scale input offset is subtracted from the input signal to set the zero-scale value for the 4-20 mA range. 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 lowpass 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, 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 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.
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 power common as it is on the 5B01 and 5B08 backplanes.
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Figure 1. 5B32 Functional Block Diagram |
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Figure 2. 5B32 Input Field Connections |
Input Ranges |
Output Ranges |
4 mA to 20 mA |
0 to +5 V (-5 V to +5 V custom) |
Model | Input Range |
Output Range |
|
Order Now | 5B32-01 |
4 mA to 20 mA | 0 V to +5 V |
Order Now | 5B32-02 |
0 mA to 20 mAV |
0 V to +5 V |
5B32-Custom |
* |
* |
* Custom Input/Output ranges are available. Refer to configuration guide.
Description | Model 5B32 |
Input Ranges |
|
Standard Ranges |
0 mA to 20 mA or 4 mA to 20 mA |
Custom Ranges |
0 mA to 20 mA (refer to ordering section) |
Output Ranges (RL > 50 kΩ)4 |
-5 V to +5 V or 0 V to +5 V |
Accuracy2 | |
Initial @ +25°C |
±0.05% Span ±0.05% Iz1 |
Nonlinearity |
±0.02% Span |
Input Offset vs. Temperature |
±0.0025 of Iz/°C |
Output Offset vs. Temperature |
±20 µV/°C |
Gain vs. Temperature |
±0.0025% of Reading/°C |
Input Resistor5 |
|
Value | 20.0 Ω |
Accuracy | ±0.1% |
Stability vs. Temperature | ±0.001%/°C |
Noise |
|
Input, 0.1 Hz to 10 Hz Bandwidth |
10 nA rms |
Output, 100 kHz Bandwidth |
200 µV rms |
Bandwidth, -3 dB | 4 Hz |
Output Rise Time, 10% to 90% Span |
200 ms |
Common-Mode Voltage (CMV)3 |
|
Input-to-Output, Continuous |
1500 V rms maximum |
Output-to-Power, Continuous |
±3 V maximum |
Transient | ANSI/IEEE C37.90.1-1989 |
Common-Mode Rejection (CMR) | |
1 kΩ Source Imbalance, 50/60 Hz |
160 dB |
Normal Mode Rejection 50/60 Hz |
60 dB |
Input Protection |
|
Continuous |
240 V rms maximum |
Transient |
ANSI/IEEE C37.90.1-1989 |
Output Resistance4 |
50 Ω |
Voltage Output Protection |
Continuous Short to Ground |
Output Selection Time | 6 µs @ Cload = 0 to 2,000 pF |
Output Enable Control |
|
Max Logic "0" | +1 V |
Min Logic "1" |
+2.5 V |
Max Logic "1" |
+36 V |
Input Current "0" |
0.4 mA |
Power Supply Voltage |
+5 V ±5% |
Power Supply Current | 30 mA |
Power Supply Sensitivity, RTI |
±2 µV/Vs% |
Mechanical Dimensions |
2.275" x 2.375" x 0.595" (57.8 mm x 59.1 mm x 15.1 mm) |
Environmental |
|
Temperature Range |
|
Rated Performance | -25°C to +85°C |
Operating | -40°C to +85°C |
Storage | -40°C to +85°C |
Relative Humidity |
0 to 93% @ +40°C noncondensing |
RFI Susceptibility |
±0.5% Span error @ 400 MHz, 5 Watt, 3 ft |
1 Iz is the nominal input current that results in a 0 V output.
2 Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes RL > 50 kΩ. Does not include current-to-voltage input resistor (AC1362) error.
3 The output common must be kept within ±3 V of power common.
4 Loads heavier than 50 kΩ will degrade nonlinearity and gain temperature coefficient.
5 The current-to-voltage conversion resistor (AC1362) is supplied as a plug-in component for mounting external to the module. All backplanes and mounting cards provide pin sockets for mounting the AC1362 resistor.
Specifications subject to change without notice.
2 Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes RL > 50 kΩ. Does not include current-to-voltage input resistor (AC1362) error.
3 The output common must be kept within ±3 V of power common.
4 Loads heavier than 50 kΩ will degrade nonlinearity and gain temperature coefficient.
5 The current-to-voltage conversion resistor (AC1362) is supplied as a plug-in component for mounting external to the module. All backplanes and mounting cards provide pin sockets for mounting the AC1362 resistor.
Specifications subject to change without notice.