3B Series Overview | 3B Series Model Defintions | Available 3B Series Modules | 3B Series Backplanes | 3B Series Power Supplies
3B Series Accessories | 3B Series Configuration Guide | 3B Series Custom Configuration Ranges | All Series Modules
The 3B30 and 3B31 are narrow-bandwidth (3Hz) single-channel signal conditioning modules which amplify, isolate, filter and protect analog input voltages and provide simultaneous precision voltage and current outputs. Each module performs complete signal conditioning, including isolating (±1500 V peak input-to-output and power) and protecting their computer side outputs from damage and loss of signal integrity, and shielding their inputs from damage from field-side overvoltage faults up to 220 V rms. The current output withstands 130 V rms without damage and interfaces user equipment through screw terminals located on the 3B Series backplane. Each plug-in, mix-and-match, hot-swappable module is easily field calibrated via front-panel zero and span adjustments for both voltage and current outputs.
3B Series Custom-Ranging Program
Externally-programmable versions, Models 3B30-00 and 3B31-00, enable the user to configure a special input range by using the optional plug-on AC1310 ranging card, which houses user-supplied resistors to determine zero and span. To facilitate selecting resistors, a Windows® program, 3B-CUSTOM, calculates resistor values based on the user-desired input/output ranges.
Inside the 3B30 and 3B31 Series Module
A chopper-stabilized low-drift (±1µV/°C) input amplifier assures stable long-term stability. At the amplifier input, a stable, zero-scale input voltage is subtracted from the input signal to set the zero-scale value. Zero suppression can exceed 100% of the input range. This is ideal for expanded-scale applications requiring high-resolution measurement of a selected portion of an input signal. For user convenience, the zero and span can be factory configured to meet custom range needs (Models 3B30-CUSTOM and 3B31-CUSTOM) or can be externally programmed (Models 3B30-00 and 3B31-00) via user supplied resistors inserted in the optional AC1310 plug-on ranging card. Internal lowpass filtering with a 4 Hz cutoff (-3 dB) two-pole Butterworth filter enhances both 60 dB normal-mode and 160 dB common-mode rejection at 50/60 Hz, enabling accurate measurement of small signals in high electrical noise.
Signal isolation is accomplished by transformer coupling with 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 voltage; this output also drives a voltage-to-current (V/I) converter to provide a simultaneous current output for interfacing versatility.
Figure 1. 3B30 and 3B31 Functional Block Diagram
Figure 2. 3B30 Input
Figure 3. 3B31 Input
-10 V to +10 V
0 to 20 mA or 4 to 20 mA
3B30 and 3B31 Models Available
|Model||Input Range||Output Ranges1|
|Order Now||3B30-00||Externally Programmable2||-10 V to +10 V & 0 mA to 20 mA|
|Order Now||3B30-01||-10 mV to +10 mV||-10 V to +10 V & 0 mA to 20 mA|
|Order Now||3B30-02||-50 mV to +50 mV||-10 V to +10 V & 0 mA to 20 mA|
|Order Now||3B30-03||-100 mV to +100 mV||-10 V to +10 V & 0 mA to 20 mA|
|Order Now||3B31-00||Externally Programmable2||-10 V to +10 V & 0 mA to 20 mA|
|Order Now||3B31-01||-1 V to +1 V||-10 V to +10 V & 0 mA to 20 mA|
|Order Now||3B31-02||-5 V to +5 V||-10 V to +10 V & 0 mA to 20 mA|
|Order Now||3B31-03||-10 V to +10 V||-10 V to +10 V & 0 mA to 20 mA|
|3B31-Custom||*||-10 V to +10 V & 0 mA to 20 mA|
1 Output current range may be user programmed to 4 mA to 20 mA using jumper supplied.
2 Requires AC1310 ranging card.
* Custom Input/Output ranges are available. Refer to configuration guide.
3B30 and 3B31 Specifications
(typical @ +25°C and ±15 V dc, and +24 V dc Power)
|Description||Model 3B30||Model 3B31|
|Standard Ranges||±10 mV to ±100 mV||±1 V to ±10 V|
|Custom Ranges||±5 mV to ±500 mV||±0.5 V to ±20 V|
|Voltage (RL > 2 KΩ)||-10 V to +10 V||*|
|Current (RL = 0 to 850Ω)1||4 mA to 20 mA or 0 mA to 20 mA||*|
|Maximum Current Output Span||0 mA to 31 mA||*|
|Initial @ +25°C||±0.1% Span||*|
|Stability vs. Temperature|
|Zero||±1 µV/°C (RTI)||±25 ppm of Span/°C|
|Span||±25 ppm of Reading/°C||*|
|Zero||±25 ppm of Span/°C||*|
|Span||±25 ppm of Reading/°C||*|
|Zero and Span Adjustment Range4||±5% of Span||*|
|Input Bias Current||+3 nA||*|
|Input Resistance||15 MΩ||650 kΩ|
|Input, 0.1 Hz to 10 Hz Bandwidth||0.2 µV rms||*|
|Output, 100 kHz Bandwidth||50 µV rms||*|
|Bandwidth, -3 dB||3 Hz||*|
|Output Rise Time, 10% to 90% Span||200 ms||*|
|Common-Mode Voltage (CMV)|
|Input-to-Output, Continuous||±1500 V peak, maximum||*|
|Common Mode Rejection (CMR)|
|1 kΩ Source Imbalance, 50/60 Hz||160 dB||160 dB
150 dB (3B31-02); 145 dB (3B31-03)
|Normal Mode Rejection, 50/60 Hz||60 dB||*|
|Continuous||220 V rms maximum||*|
|Voltage Output Protection||Continuous Short to Ground||*|
|Current Output Protection||130 V rms, continuous||*|
|Power Supply Voltages 5|
|±15 V dc Supplies|
|Rated Operation||±(11.5 V dc to 16.5 V dc)||*|
|+24 V dc Loop Supply|
|Rated Operation||+12 V dc to +30 V dc||*|
|Current||+27 mA @ lout = 20 mA||*|
|Mechanical Dimensions||3.15" x 3.395" x 0.775"
80.0 mm x 86.2 mm x 19.7 mm)
|Rated Performance||-25°C to +85°C||*|
|Storage||-55°C to +85°C||*|
|Relative Humidity, 24 hours||0 to 95% @ +60°C noncondensing||*|
|RFI Susceptibility||±0.5% Span error @ 400 MHz, 5 Watt, 3 ft||*|
* Specifications same as model 3B30.
1 For a 0 to 20 mA range, a typical minimum output current is 10 µA.
2 Includes the combined effects of repeatability, hysteresis, and nonlinearity.
3 With respect to the voltage output.
4 A wide range of custom zero suppression and span is available with the 3B30-00 and 3B31-00 models, using the AC1310 ranging card.
5 +24 V dc loop power is required for driving the current output at loads up to 850Ω. If a current output load of 400Ω or less is applied, +15 V dc is sufficient for loop power. If only voltage output is used, loop power is not required.
Specifications subject to change without notice.