3B42/3B43/3B44 ISOLATED AC SINE WAVE INPUT

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Functional Description

The 3B42, 3B43 and 3B44 are single-channel AC sine wave signal conditioning modules which use an AC averaging technique to rectify, amplify, and filter 50 Hz to 400 Hz sine-wave signals ranging from 20 mV to 550 V rms to give an rms output reading. Simultaneous precision voltage and current outputs are provided. including isolation (±1500 V peak input-to-output and power). The 3B42 and 3B43 modules withstand 220 V rms, and Model 3B44 withstands 550 V rms at its input terminals without damage, thereby shielding computer-side circuitry from field-side overvoltage conditions. 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 3B42-00, 3B43-00 and 3B44-00, 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 3B42, 3B43 and 3B44 Modules

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.

Figure 1. 3B42, 3B43, 3B44 Functional Block Diagram

Figure 2. 3B42, 3B43, 3B44 Input Field Connections

Inputs 3B42: 20 V rms to 1 V rms 3B43: 1 V rms to 50 V rms 3B44: 50 V rms to 550 V rms Dual Outputs 0 to +10 V 4 mA to20 mA or 0 to 20 mA

3B42, 3B43 and 3B44 Models Available

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.

3B42, 3B43 and 3B44 Specifications
(typical @ +25�C and ±15 V dc, and +24 V dc Power)

* Specifications same as model 3B42.
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 Models 3B42-00, 3B43-00 and 3B44-00, 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.