5B30/5B31 MILLIVOLT AND VOLTAGE INPUT




Functional Description

5B30-01/31-06 The 5B30 and 5B31 are single-channel signal conditioning modules that amplify, protect, filter and isolate analog input voltages.

The 5B30 and 5B31 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, 5B30 and 5B31 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 5B30/5B31 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.

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 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.

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. The enable input should be grounded to power common if the output need not be switched.



5B30/5B31FBD

Figure 1. 5B30 and 5B31 Functional Block Diagram

5B30/5B31IFC

Figure 2. 5B30 and 5B31 Input Field Connections

 

Input Ranges

5B30 mV Input:
±10 to ±100 mV
(±5 to ±500 mV ­ custom)

5B31 V Input:
±1 to ±20 V
(±0.5 to ±20 V ­ custom)

Output Ranges

5B30/5B31:
-5 V to +5 V or 0 to +5 V


5B30 and 5B31 Models Available

  Model Input Range Output Range
Order Now 5B30-01 -10 mV to +10 mV -5 V to +5 V
Order Now 5B30-02 -50 mV to +50 mV -5 V to +5 V
Order Now 5B30-03 -100 mV to +100 mV -5 V to +5 V
Order Now 5B30-04 -10 mV to +10 mV 0 V to +5 V
Order Now 5B30-05 -50 mV to +50 mV 0 V to +5 V
Order Now 5B30-06 -100 mV to +100 mV 0 V to +5 V
  5B30-Custom * *
 
  Model Input Range Output Range
Order Now 5B31-01 -1 V to +1 V -5 V to +5 V
Order Now 5B31-02 -5 V to +5 V -5 V to +5 V
Order Now 5B31-03 -10 V to +10 V -5 V to +5 V
Order Now 5B31-04 -1 V to +1 V 0 V to +5 V
Order Now 5B31-05 -5 V to +5 V 0 V to +5 V
Order Now 5B31-06 -10 V to +10 V 0 V to +5 V
Order Now 5B31-07 -20 V to +20 V -5 V to +5 V
  5B31-Custom * *
*Custom Input/Output ranges are available. Refer to configuration guide.

5B30 and 5B31 Specifications

Description Model 5B30 Model 5B31
Input Ranges
Standard Ranges ±10 mV to ±100 mV ±1 V to ±20 V
Custom Ranges ±5 mV to ±500 mV ±0.5 V to ±20 V
Output Ranges (RL > 50 kΩ)4 -5 V to +5 V or 0 V to +5 V *
Accuracy2
Initial @ +25°C ±0.05% Span ±10 µV RTI ±0.05% (Vz1) ±0.05% Span ±0.2 mV RTI ±0.05% (Vz1)
Nonlinearity ±0.02% Span *
Input Offset vs. Temperature ±1 µV/°C ±20 µV/°C
Output Offset vs. Temperature ±20 µV/°C *
Gain vs. Temperature ±25 ppm of Reading/°C ±50 ppm of Reading/°C
Input Bias Current ±3 nA ±0.2 nA
Input Resistance
Power On 5 MΩ 650 kΩ
Power Off 40 kΩ 650 kΩ
Overload 40 kΩ 650 kΩ
Noise
Input, 0.1 Hz to 10 Hz Bandwidth 0.2 µV rms 2 µV 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 (all ranges) 160 dB (span < ±2 V)
150 dB (span = ±10 V)
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% ±0.4 mV/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 *

* Specifications same as model 5B30.
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.
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.
Specifications subject to change without notice.

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