5B Series Overview | 5B Series Model Definitions | Available 5B Series Modules | 5B Series Backplanes and Mounting Cards | 5B and 6B Series Power Supplies | 5B Series Accessories | 5B Series Configuration Guide | 5B Series Custom Configuration Ranges | All Series Modules
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.
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.
Figure 1. 5B30 and 5B31 Functional Block Diagram
Figure 2. 5B30 and 5B31 Input Field Connections
5B30 mV Input:
5B31 V Input:
|Description||Model 5B30||Model 5B31|
|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||*|
|Initial @ +25°C||±0.05% Span ±10 µV RTI ±0.05% (Vz1)||±0.05% Span ±0.2 mV RTI ±0.05% (Vz1)|
|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|
|Power On||5 MΩ||650 kΩ|
|Power Off||40 kΩ||650 kΩ|
|Overload||40 kΩ||650 kΩ|
|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||*|
|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||*|
|Continuous||240 V rms maximum||*|
|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)
|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||*|