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The 3B20 is a wideband single-channel signal-conditioning module which interfaces 4-arm AC bridge transducer signals ranging between 1.5 mV rms and 150 mV rms, providing simultaneous precision voltage and current outputs. In addition, the module provides an AC excitation voltage of 2 V rms to 10 V rms at frequencies between 1 kHz and 10 kHz. The module withstands 130 V rms at its current output terminals without damage, thereby shielding computer-side circuitry from field-side overvoltage conditions. The 3B20 is a plug-in, mix-and-match, hot-swappable module and is easily field calibrated via front-panel zero and span adjustments for both voltage and current outputs.
3B Series Custom-Ranging Program
Externally-programmable Model 3B20-00, enables the user to configure a special input range, including tare weight suppression, 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 3B20 Series Module
The 3B20 input and AC bridge excitation output terminals are protected for up to 130 V rms. The excitation amplitude and frequency can be specified with the Model 3B20-CUSTOM or user configured with Model 3B20-00 and an optional plug-on Model AC1310 ranging card. Both the voltage and current outputs can be independently adjusted for a minimum of ±1 V for the zero and 25% of the span range with front-panel user-accessible potentiometers. In addition, phase shifts of up to 37.25° between excitation signal and the output signal from the strain gauge or torque transducer can be compensated via front-panel screw terminal adjustments.
Figure 1. 3B20 Functional Block Diagram
Figure 2. 3B20 Input Field Connections
1.5 mV rms to 150 mV rms
Full 4-Arm AC Strain Gage
AC Torque Transducer
-10 V to +10 V
4 mA to 20 mA or 0 to 20 mA
3B20 Models Available
|-10 V to +10 V &|
0 mA to 20 mA
|Order Now||3B20-01||5 V rms||3 kHz||20 mV rms||2 mV rms/V||-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.
(typical @ +25°C and ±15 V dc, and +24 V dc Power)
|Standard Range||Refer to Model Table|
|Custom Ranges||Vin = 1.5 mV rms to 150 mV rms
Vexc = 2 V rms to 10 V rms
Vexc freq. = 1 kHz to 10 kHz
|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|
|With Input Overload||40 mA, maximum|
|Initial @ +25°C||±0.1% Span|
|Stability vs. Temperature|
|Zero||±0.005% of Span/°C|
|Span||±0.01% of Span/°C|
|Zero||±25 ppm of Span/°C|
|Span||±25 ppm of Reading/°C|
|Voltage4||2 V rms to 10 V rms|
|Frequency4||1 kHz to 10 kHz, ±15%|
|Drive||Up to 20 mA rms, minimum|
|Harmonic Distortion||< 0.5%|
|Span Calibration Adjustment Range4||±25% of span, minimum|
|Zero Calibration Adjustment Range4||±1 V, minimum|
|Phase Adjustment Range5||0 to 4.25° minimum @ 1 kHz
0 to 14° minimum @ 3.28 kHz
0 to 37.25° minimum @ 10 kHz
|Input Bias Current||+10 nA|
|Input Resistance||100 MΩ|
|Bandwidth, -3 dB||100 Hz|
|Output Rise Time, 10% to 90% Span||200 ms|
|Input Protection, Signal and Excitation Voltage|
|Continuous||130 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||±(13 V dc to 18 V dc)|
|+24 V dc Loop Supply|
|Rated Operation||+13.5 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|
1 For a 0 mA 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 3B20-00 model, 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.